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1. library include files include Iwip opt h include Iwip ip_addr h include Iwip pbuf h Page 411 include ipv4 lwip ip h include lwip err h include Iwip tcp h local include files include interfac h include voipdefs h include tcpconn h include callutil h include error h local function declarations static err_t accept_connection void struct tcp_pcb err_t static err_t busy_sent void struct tcp_pcb u16_t static err_t generic_sent void struct tcp_pcb u16_t static void check_for_close void static void error_handler void err_t static err_t handle_connection void struct tcp_pcb err_t static err_t receive_data void struct tcp_pcb struct pbuf err_t Page 412 locally global shared variables status of the TCP connection static enum tcp_conn_status cur_status protocol control block for a connected call static struct tcp_pcb call_pcb the listener for incoming connections static struct tcp_pcb listener areceived data packet static short int rx_data AUDIO_BUFLEN flag indicating data is available static int have_rx_data status functions Page 413 have_tcp_connection Description This function returns TRUE if there is a valid TCP connection Operation The connection is first checked to see if it is closed Then TRUE is ret
2. Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global call_ halt call_ halt end the current call Page 88 PUSH r0 r1 save used registers LDR rO SSCO_IDR end ssc interrupts LDR r1 SSCO_IDR_VAL STR r1 r0 POP rO r1 restore registers and return BX LR CodecHandler Description CodecHandler is the event handler called when a frame sync A AQA interrupt on SSCO occurs Codec handler s basic purpose is to read the half word in SSCO s receive holding register and move that half word into a buffer of other received values CodecHandler then takes the next half word in an output buffer and writes it to SSCO s transmit holding register SSCO also checks whether either of these buffers is filled and handles such exceptions accordingly Operation CodecHandler processes an SSCO receive first then transmits data however input and output function essentially the same way CodecHandler first checks whether the receive or transmit buffer is full or empty respectively If so Page 89 CodecHandler switches the active buffer to the back up buffer and indicates a new buffer is needed If there is no active buffer received data is dropped or a 0 is transmitted If data does not need to be dropped CodecHandler inputs and outputs data normally and increments
3. EREE E EE EE EEE OEE KE EEE E EE KAE EE E EEE E E E RORE E EE EEEE EE E EEE EEE KEE EEE REEE EEE EE KKE This file contains the functions for managing the TCP interface for the VoIP Telephone Project The functions included are have_tcp_ connection have an incoming connection tcp_connection_answer answer an incoming connection tcp_connection_close close the connection tcp_connection_connect connect to an IP address tcp_connection_init initialize the connection tcp_connection_restart restart the TCP connections tcp_connection_rx attempt to receive TCP data tcp_connection_status get the connection status tcp_connection_tx attempt to transmit TCP data The local functions included are accept_connection accept a TCP connection being made callback Page 410 busy_sent the busy packet has been sent callback check_for_close check if the connection is closed and handle it error_handler handle errors for TCP connections callback handle_connection handle a TCP connection being made callback receive_data receive TCP data callback The locally global shared variable definitions included are call_pcb protocol control block for a connected call cur_status status of the TCP connection have_rx_data flag indicating received data is available listener the listener for incoming connections rx_data the data from a received data packet Revision History 3 10 11 Glen George Initial revision
4. local helper functions Page 353 clr_IP_address Description This function clears the IP address and digit count Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables IP_address changed reset to 0 IP_digit_cnt changed reset to O Author Glen George Last Modified June 3 2006 a Page 354 static void clr_IP_address variables none clear the IP address and digit count IP_address 0 IP_digit_cnt 0 and return return Page 355 JEENE KEEA EREEREER RE REL ERA ALE TES EEE CEL eC Te ROL CT eae eT eee Ree KERERE KEYPROC i Miscellaneous Key Processing Functions 7 VolP Telephone Project 7 EE CS 52 PEEEEAELEREEE RAL SERELARARERAAEAREEELERER EERE EALASE REAR ER REEE E EEREEREEEEEEEKE This file contains the general key processing functions for the VoIP Telephone Project These functions are called by the main loop of the system The functions included are no_action nothing to do reset_input reset the input state The local functions included are none The global variable definitions included are none Revision History Page 356 6 3 06 Glen George Initial revision library include files none local include files include voipdefs h include
5. note the array must match the enum definition order exactly Page 370 const static enum keytype key_type KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_DIGIT KEYTYPE_ESC KEYTYPE_BS KEYTYPE_SEND KEYTYPE_OFFHOOK KEYTYPE_ONHOOK KEYTYPE_SETIP lt 0 gt lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt ESC gt lt Backspace gt lt Send gt lt Set IP gt g Off Hook On Hook KEYTYPE_SETSUBNET lt SetSubnet gt KEYTYPE_SET_GW KEYTYPE_MEMSAVE lt Set Gateway gt lt Memory Save gt KEYTYPE_MEMRECALL lt Memory Recall gt KEYTYPE_UNKNOWN Page 371 other keys array of key value translations from enum keycode to int note the array must match the enum definition order exactly const static int key_value 0 1 lt 0 gt lt i gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt KEYCODE_ESC KEYCODE_BS KEYCODE_SEND lt ESC gt lt Backspace gt lt Send gt KEYCODE_OFFHOOK Off Hook key KEYCODE
6. order must match nkeys array exactly KEYCODE_0 lt 0 gt KEYCODE_1 lt 1p gt KEYCODE_2 lt 2 gt KEYCODE 3 lt 3 gt KEYCODE_4 lt 4 gt KEYCODE_5 lt 5 gt KEYCODE 6 lt 6 gt KEYCODE_7 lt 7 gt af Page 382 KEYCODE_8 lt 8 gt KEYCODE_9 lt 9 gt KEYCODE_ESC lt ESC gt KEYCODE_BS lt Backspace gt KEYCODE_SEND lt Send gt KEYCODE_OFFHOOK Off Hook KEYCODE_ONHOOK On Hook KEYCODE_SETIP lt Set IP gt KEYCODE_SETSUBNET lt Set Subnet gt KEYCODE_SET_GW lt Set Gateway gt KEYCODE_MEMSAVE lt Memory Save gt KEYCODE_MEMRECALL lt Memory Recall gt KEYCODE_ILLEGAL entry needed for illegal codes const enum keycode keycodes pointer to appropriate keycode array const static int nnkeys array of key values for non numeric precedence order must match keycodes array exactly KEY_ESC lt ESC gt KEY_BACKSPACE lt Backspace gt KEY_SEND lt Send gt KEY_OFFHOOK Off Hook KEY_ONHOOK On Hook Page 383 KEY_SET_IP lt Set IP gt KEY_SET_SUBNET lt SetSubnet gt KEY_SET_GATEWAY lt Set Gateway gt KEY_MEM_SAVE lt Memory Save gt KEY_MEM_RECALL lt Memory Recall gt KEY_0 lt 0 gt KEY_1 lt 1 gt KEY_2 lt 2 gt KEY_3 lt 3 gt KEY_4 lt A gt KEY_5 lt 5 gt
7. 2012 2 24 Josh Fromm Initial Revision Page 78 2012 3 4 Josh Fromm Code updated to actually work 2012 3 29 Josh Fromm Comments updated PCO OCOEOC ECO CECE LOLOL O EOE EEE OC LOLOL EEE ECEEEELLEECECEEEEO CO OCOEOC ECE OCEEC OL OLOL OEE ECE EEL LEE EEE EEEELEEECE include at91rm9200 inc include armvoip inc include audio inc text arm align 2 Audio initialization ssc0_init Description sscO_init sets up the many registers needed for the CPUs synchronous serial controller to function properly sscO_init also performs a hardware reset on the system s codec Operation Moves many control words into appropriate registers to set up the SSC and uses a wait loop to allow for an appropriate Page 79 hardware reset Arguments None Return Values None Local Variables rO contains addresses and control words r1 contains addresses and control words Shared Variables None Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None Page 80 Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global sscO_init sscO_ init PUSH r0 r1 save used registe
8. Input Keys from the keypad Output Status information to the display Error Handling Invalid input is ignored Algorithms The function is table driven The processing routines for each input are given in tables which are selected based on the context state the program is operating in Data Structures None Global Variables None Author Glen George Last Modified March 8 2009 int main variables enum keycode key an input key Page 369 int timeout ethernet timing information enum status cur_status STAT_IDLE current program status enum status prev_status STAT_IDLE previous program status array of status type translations from enum status to defines note the array must match the enum definition order exactly const static unsigned int xlat_stat STATUS_IDLE system idle STATUS_OFFHOOK phone is off hook STATUS_RINGING incoming call STATUS_CONNECTING attempting to connect STATUS_CONNECTED connected to remote phone STATUS_SET_IP setting the IP address STATUS_SET_SUBNET setting the subnet address STATUS _SET_GATEWAY setting the gateway address STATUS_MEM_SAVE saving an address to memory STATUS_MEM_RECALL recalling an address from memory STATUS_RECALLED just recalled an address from memory array of key type translations from enum keycode to enum keytype
9. KEY_6 lt 6 gt KEY_7 lt 7 gt KEY_8 lt 8 gt KEY_9 lt 9 gt const static int nkeys array of key values for numeric precedence order must match keycodes array exactly KEY_0 lt 0 gt KEY_1 lt 1 gt KEY_2 lt 2 gt KEY_3 lt 3 gt a KEY_4 lt 4 gt Page 384 KEY_5 lt 5 gt KEY_6 lt 6 gt KEY_7 lt 7 gt KEY_8 lt 8 gt KEY_9 lt 9 gt KEY_ESC KEY_BACKSPACE KEY_SEND KEY_OFFHOOK KEY_ONHOOK KEY_SET_IP KEY_SET_SUBNET lt ESC gt lt Backspace gt lt Send gt Off Hook E On Hook lt Set IP gt lt Set Subnet gt KEY_SET_GATEWAY lt Set Gateway gt KEY_MEM_SAVE KEY_MEM_RECALL lt Memory Save gt lt Memory Recall gt constint keys pointer to appropriate key array int key an input key int i general loop index Page 385 figure out which array to use if numeric should be using the numeric precedence arrays keycodes nkeycodes keys nkeys else should be using the non numeric precedence arrays keycodes nnkeycodes keys nnkeys get a key key getkey lookup key in the appropriate keys array note that nnkeys and nkeys should be the same size so can use either in the comparison for i 0 i lt sizeof nkey
10. REEREELERL CE RAL EES CERCLA EE EEE TR Eee TERE EERE LER LE LSC STR EE REEERE REEERE ETHERNET Ethernet Interface Functions 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE KEE KE EREK E E E KAE EE E E E E E E RORE EE EEEE EE E EER EEE KEE EKE EEEE RES EE EEK E This file contains the ethernet interface low level driver functions for the VoIP Telephone Project These functions are used to interface the VoIP code with the IwIP code This file should only be compiled into the project if lwIP is being used The functions included are ethernetif_init initialize the ethernet interface ethernetif_input get input from the ethernet interface ethernetif_output send output to the ethernet interface init_networking initialize the ethernet interface and library The local functions included are none The global variable definitions included are et0 the network interface to use for the phone Page 305 Revision History 6 11 09 Glen George Initial revision based on IwIP ethernetif c file 6 13 09 Glen George Fixed polarity problems with return values for ether_init and ether_transmit 3 8 11 Glen George Get the MAC address from interfac h instead of hard coding it library include files include Iwip opt h include Iwip ip_addr h include Iwip mem h include Iwip memp h include Iwip pbuf h include Iwip netif h include netif etharp h include I
11. c 1 1 gt 1 1 1 1 0 0 0 return to idle state c 1 1 gt 1 1 1 1 0 0 0 confirm idle state now test multiple reads c 0 1 gt 1 1 1 1 1 1 1 move to state 1 c 0 1 gt 0 1 1 1 0 0 0 move to state 2 c 0 1 gt 0 1 0 1 0 0 1 move to read state 3 c 0 1 gt 0 O O 1 1 0 1 move to read state 4 C 0 1 gt 0 O O 1 0 0 1 move to read state 5 c 0 1 gt 0 O O 1 0 1 0 move to read state 6 Page 41 ay lt a ay lt a L aes aes l eG Gs L aC Gs L aC Ges l ogg Gy Gg ae 3Gy YG Gs Gy C C h C C Page 42 1 gt 1 gt 1 gt ijel 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt iji 1 gt iji 1 gt ijl 1 gt iji 1 gt i gt i 1 gt 1 gt 1 gt 1 0 1 1 1 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 0 0 1 1 1 0 1 1 0 0 1 1 0 1 0 1 0 1 1 1 0 0 0 1 0 0 0 1 0 0 0 1 4 1 1 4 1 0 0 0 1 0 0 1 1 1 0 1 1 0 0 1 1 0 1 0 1 0 1 1 1 0 0 0 1 0 0 0 1 0 0 0 move to read state 7 move to read state 8 return to idle state confirm idle state move to state 1 move to state 2 move to read state 3 move to read state 4 move to read state 5 move to read state 6 move to read state 7 move to read state 8 return to idle state confirm idle state
12. display the new IP address display_IP IP_address was there a recalled IP address on the screen if cur_status STAT_RECALLED if so need to switch to idle state since don t have that address anymore cur_status STAT_IDLE Page 336 and return the possibly new status return cur_status add_IPDigit Description This function handles a digit key when an IP address is being input It adds the passed key value to the current value of the IP address If there is an overflow more than 32 bits or a byte value greater than 255 the error handler is called and the key is ignored The function returns with the system status it was passed Arguments cur_status enum status the current system status key_value int value of the input key Return Value enum status the new status same as current status Input None Output None Page 337 Error Handling If the input causes the IP address to have more than 32 bits or if a byte in the address would be greater than 256 the error handler is called with the error IP_ADDRESS OVERFLOW and the key is ignored Algorithms None Data Structures None Shared Variables IP_address changed updated to new address based on the passed key value IP_digit_cnt changed updated to reflect which decimal digit of the IP address will be input next Author Glen George Last Modified June 3 2006 enum status add_
13. initiate_outgoing Description This function initiates an outgoing call to the currently set IP address Operation An attempt is made to connect to calling IP Page 265 Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables calling_IP accessed IP to connect to Author Glen George Last Modified March 9 2011 void initiate_outgoing variables none Page 266 start trying to get a connection and return tcp_connection_connect calling_IP return Ve start_call Description This function starts an outgoing call Operation The buffers are initialized the call state is set to connected the ring and busy tones are started and the call is started Arguments None Return Value None Input None Output None Page 267 Error Handling None Algorithms None Data Structures None Shared Variables last_status changed setto CALL_NO_CONNECTION ring_busy_timer changed set to 0 Author Glen George Last Modified March 9 2011 Ph void start_call variables none reset the buffers for a new call reset_rx_buffer reset_tx_buffer Page 268 start the audio portion of the call Note buffer had better be available now call_start get_rx_buffer the prior call status
14. none local include files include interfac h constants number of transmit and receive buffers define NUM_RX_BUFFERS 20 must be at least 4 more is better define NUM_TX_BUFFERS 20 must be at least 4 more is better Page 239 structures unions and typedefs none function declarations initialization functions void init_buffers void initialize the buffer system void reset_rx_buffer void reset the receive buffer to empty void reset_tx_buffer void reset the transmit buffer to empty status functions int rx_available void there is a buffer available for mic data int xmit_available void there is a buffer ready to send over ethernet int tx_available void there is a buffer available to play int rcv_available void there is a buffer ready to fill from ethernet blocking functions for getting buffers short int get_rx_buffer void get a buffer to fill with mic data short int get_rx_next_ptr void get the pointer to next buffer w o allocating it short int get_xmit_buffer void get a buffer to send over ethernet Page 240 short int get_xmit_next_ptr void get the pointer to next ethernet buffer w o allocating it short int get_tx_buffer void get a buffer to send to the speaker short int get_tx_next_ptr void get the pointer to next buffer w o alloc
15. none start the outgoing call initiate_outgoing and return the new status STAT_CONNECTING return STAT_CONNECTING Page 247 end_call Description This function handles the end of a call when the user hangs up Operation It disconnects the call by calling disconnect_call and returns the status STAT_IDLE Arguments cur_status enum status the current system status ignored key_value int value of the key that was input ignored Return Value enum status the new status always STAT_IDLE Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Page 248 Author Glen George Last Modified June 3 2006 enum status end_call enum status cur_status int key_value variables none disconnect the call disconnect_call and return with the new status idle return STAT_IDLE Page 249 EERE KEEA EREEREER RE REL ERA LET EE KE EEEE Le Te Te REEE EEE ae eT eee ee ee TE REE CALLUTIL ig i Calling Utility Functions 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE EE KE EE K E E E AE E E E E E E E RORE EE EEEE EE E EER EEE KEE EEE EKE RES E E EEK E This file contains the utility functions for dealing with calls for the VoIP Telephone Project The IP number of the other end of the call is also defin
16. Page 50 TEST_VECTORS JTAGRST NRST NCSO NCS1 NRD gt BJTAGRST U5DIR USOE run through possible combinations as a test 0 0 0 0 0 gt 0 0 1 0 1 0 1 1 gt 0 1 1 1 0 1 0 1 gt 0 1 1 1 1 1 1 1 gt 1 1 0 END Page 51 Reset Circuit The reset circuit of the system U9 is fairly straight forward The chip used has several features however only its watchdog timer was used When the watchdog pin is grounded for several seconds the reset pin which is normally driven high drops low for a moment Thus the reset switch is a connection between the watchdog pin and ground U9 also features an LED between power and U9 s power pin This LED serves to indicate when the board is powered The reset signal produced by U9 is connected to U20 a 5V tolerant 3 3V buffer The output of U20 is then connected directly to the systems NRST line The reset signal generated by U9 is also used as input into U8 to generate the debugger reset signal which is also passed through U20 before going to the NJTAGTRST pin on the CPU Keypad and Encoder Keypad interaction with other components is very limited The keypad encoder U18 is the only thing that interacts directly with the keypad U19 U18 scans each column of the keypad at a very fast rate and detects whether a key in that column is being pressed If a key press is detected U18 outputs a key code to U1 Because only one column is scanned at a time simultaneous k
17. Page 9 Display Contrast Dial iSound Mute Switch Image showing location of user interface components The user also can monitor the status of Ethernet connections through the LEDs on the Ethernet jack LED 1 indicates Ethernet activity meaning it should blink when functioning LED 2 indicates the speed setting of the Ethernet and should be on if no Ethernet cable is plugged in and off if Ethernet is plugged in LED 3 indicates whether a link is being made and so should be off when no cable is plugged in and on when a cable is plugged in Page 10 If no speaker or microphone is plugged in the system will not function properly Thus the user must properly plug in both a speaker in microphone to make phone calls This is done by plugging a speaker into the speaker jack and a microphone into the microphone jack as seen below Page 11 hone Jack Q O Page 12 Overview of System Hardware The basic interaction of hardware in the VOIP system is outlined in the following block diagram Page 13 Page 14 zs33 WWOuws Hsor WVYSVIC 490718 dlOA WHY Explanation of Each Block CPU The system uses an ARM 920T processor The CPU is the core of the system all other blocks interact directly with the CPU The majority of peripherals SRAM ROM DRAM display and keypad interact with the CPU through the static memory controller SMC Other peripherals interact with more specific controllers
18. TCO_CCR TCO_CMR TCO_RC TCO_CV TCO_SR TCO_IER OxFFFA0000 TCOBase 0x0 TCOBase 0x4 TCOBase Ox1C TCOBase 0x10 TCOBase 0x20 TCOBase 0x24 base address Channel Control Channel Mode Register C Counter Value Status Register Interrupt Enable equ TCO_IDR TCOBase 0x28 Timer Counter 1 Definitions equ equ equ equ equ equ equ equ EMAC Definitions equ equ equ equ equ equ Page 73 TC1Base TC1_CCR TC1_CMR TC1_RC TC41_CV TC1_SR TC1_IER TC1_IDR EMAC_RSR OxFFFBCO20 EMAC_MAN OxFFFBCO34 EMAC_HSH OxFFFBCO90 EMAC_MCOL OxFFFBCO48 EMAC_ISR OxFFFBCO24 EMAC_IER OxFFFBCO28 OxFFFA0040 TC1Base 0x0 TC1Base 0x4 TC1Base 0x1C TC1Base 0x10 TC1Base 0x20 TC1Base 0x24 TC1Base 0x28 Interrupt Disable base address Channel Control Channel Mode Register C Counter Value Status Register Interrupt Enable Interrupt Disable Receive Status PHY Maintenance Hash Address High 63 32 Multiple Collision Frame Interrupt Status Register Interrupt Enable equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ Page 74 EMAC_SA2H EMAC_HSL EMAC_LCOL EMAC_OK EMAC_CEFG EMAC_SA3L EMAC_SEQE EMAC_ECOL EMAC_ELR EMAC_SR EMAC_RBQP EMAC_CSE EMAC_RIJB EMAC_USF EMAC_IDR EMAC
19. cur_status STAT_MEMSAVE break case KEYCODE_MEMRECALL lt Memory Recall gt key was seen new status is recalling an IP from memory cur_status STAT_MEMRECALL break default some other key was seen generate an error and leave status unchanged process_error UNKNOWN_KEYCODE_INIT break and return the new status return cur_status Page 395 clear_memLoc Description This function handles the clear key when a memory location number is being input It clears the current memory location number displays the now cleared number and returns with the system status it was passed Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status same as current status Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables memloc changed set to 0 Author Glen George Page 396 Last Modified June 3 2006 enum status clear_memLoc enum status cur_status int key_value variables none clear the current memory location number memloc 0 display the new memory address display_memory_addr memloc and return the current status return cur_status Page 397 add_memDigit Description This function handles a digit key when a me
20. 1 KeypadInit Sets ups registers and shared variables needed for keypad functions to run Also installs the keypad event handler 2 KeypadPressHandler Called whenever user presses a key Stores the key code of the key press or shifts the keypad 3 call_halt Ends SSCO interrupts so that no audio dataisinputor output 4 key_available Checks whether there is an unhandled key press or not 5 getkey returns the key code of the most recent key press Revision History 2012 2 5 Josh Fromm Initial Revision 2012 3 29 Josh Fromm Comments updated PCO OCOO ECO CEEC ELL OEE CECE ECOLOLOL EEE ECEEE ELL EEE ECEEEO CO OCECOC ECE CEEOL LOLOL OEE ECE EEL LEE EEE EEEELEEECE include at91rm9200 inc Page 196 include armvoip inc include keypad inc text arm align 2 Keypad initialization Keypadinit Description KeypadInit sets up the registers needed to run the rest of the keypad functions KeypadInit also installs KeypadPressHandler as the interrupt handler for PIOC interrupts Operation Moves many control words into appropriate registers Arguments None Return Values None Local Variables rO contains addresses and control words Page 197 r1 contains addresses and control words Shared Variables keypressed shiftkey Global Variables None Input None Output None Err
21. Known Bugs None Limitations None Page 167 Revision Hisotry 3 3 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments Updated global ether_init ether_init PUSH r0 r1 r2 r3 r4 r5 save used registers LDR r2 OxO set counter to zero build_RBQP LDR rO RBQP load address of first chunk of the RBQP MOV r4 r2 get the current counter value into r4 LSL r4 0x3 each chunk consists of 2 words so need to shift over by 8 bytes for each finished chunk ADD rO rO r4 add this to base of RBQP to arrive at beginning of current chunk LDR r4 RBQP_ALLOC determine start address of current buffer MUL r3 r2 r4 multiply the current counter value by the size of a buffer LDR r5 RBQP_BUFF load the start address of the RBQP buffer space ADD r3 r3 r5 add the offset calculated to the start address STR r3 r0 put address into buffer Page 168 ADD rO 0x4 move one word over LDR r4 RBQP_BUFFER_SIZE STR r4 r0 store length ADD r2 r2 0x1 increment counter by 1 CMP r2 NUM_RBQP_BUFFERS if all buffers have been built we can continue BNE build_RBQP if not keep building buffers SUB rO rO 0x4 if code reaches this point the last chunk is being built so we must move back one word and set bit 1 to 1 to indicate wrap ADD r3 r3 WRAP_BIT set the wrap bit to 1 STR r3 r0 init_ether_regs set up ethernet control registers and convert pio a and b pins to p
22. NCSOCON LDR r1 SMC_CSRO STR rO r1 set up chip select zero with control word LDR rO NCS1CON LDR r1 SMC_CSR1 STR rO r1 set up chip select one with control word LDR rO NCS2CON LDR r1 SMC_CSR2 STR rO r1 set up chip select two with control word LDR rO NCS3CON LDR r1 SMC_CSR3 STR rO r1 set up chip select three with control word Loop to catch execution if main returns or you have no main AAALAC Page 138 You will eventually call Glen s main function here BL Keypadinit BL displayInit BL TimerOInit BL sscO_init B main LowLevellnitEndLoop B LowLevellnitEndLoop end Page 139 display inc This file contains the constants used by the functions that run the VOIP system s display output Revision History 2012 2 5 Josh Fromm Initial Revision equ equ equ equ equ equ MEMORY_SIZE 0x80 im not sure what this does but im scared to take it out ASCII_ZERO 0x30 ASCII value for O ASCII_ELLIPSE Ox2E ASCII value for ASCII_NULL 0x0 ASCII value for null ASCII_A 0x41 ASCII value for A DISPLAY_WRITE 0x30000001 address used when writing to display equ DISP_CS 0x30000000 Register written to during equ equ equ equ display initialization NibShiftsPerWord 0x8 nibbles per word MAX_10 0x64 maximum value that can be used in one chunk of an IP address Num_Shifts 0x18 initial number of shifts needed to
23. Page 31 100ns Ops 100ns 200ns 300ns 400ns 500ns 600ns 700ns lirtibistthitcb ebb i HONDO OOOO HOODOO OOOO MCK VOUDUUUUUUU UU UUUU UU UU UU UU ug a aa SMC4 NCS3 o NWRO o gt Setup Cycles aoas 15 0 0 PK eee ets wes ide D NCAS l a tSU W C i tH CAS W ao 5 tPD NWE l T i 7 E 15 0 Rbw Address MUXt a power gener mux2 15 0 chiumnAddeds O O O SMC22 tSU O CAS tH CAS D SMC14 tH RAS D Data 15 0 O Diagram of the signals and timings used in a DRAM write Page 32 Signal Name Signal Description Signal Time ns tCWw Write Cycle Time 260 tSU W CAS Write setup time before CAS 0 low tH CAS W Write hold time after CAS low 30 tH RAS W Write hold time after RAS low 105 tH W RAS RAS hold time after write 45 tH W CAS CAS hold time after write 45 tW Write pulse width 30 tSU D CAS Data in setup time before CAS 0 low tH CAS D Data in hold time after CAS 30 low th RAS D Data in hold time after RAS 105 low Explanation of signals and timings for a DRAM write The following 11 pages are the code written in ABEL used to program the DRAM controller The code sets up the PLD as a Moore state machine that outputs the proper signals and changes state with each rising clock edge Page 33 MODULE DramController TITLE DramController Dram Controller Device GAL22V10 This GAL i
24. X X x X X X then check read sequence outputs c 1 1 gt 1 1 1 1 0 0 0 confirm that idle state is maintained C 1 1 gt 1 1 1 1 0 0 0 c 0 1 gt 1 1 1 1 1 1 1 move to state 1 c 0 1 gt 0 1 1 1 0 0 0 move to state 2 c 0 1 gt 0 1 O 1 0 0 1 move to read state 3 C 0 1 gt 0 O O 1 1 0 1 move to read state 4 c 0 1 gt 0 O O 1 0 0 1 move to read state 5 c 0 1 gt 0 O O 1 0 1 0 move to read state 6 c 0 1 gt 0 O O 1 0 1 1 move to read state 7 c 0 1 gt 1 1 0 1 0 0 0 move to read state 8 c 1 1 gt 1 1 1 1 0 0 0 return to idle state c 1 1 gt 1 1 1 1 0 0 0 confirm idle state now begin to test write sequence c 0 O gt 1 1 1 1 1 1 1 move to state 1 c 0 O gt 0 1 1 1 0 0 0 move to state 2 c 0 O gt 0 1 0 0 0 0 0 move to write state 3 Page 39 ay V C P aes V C aes es i eG 0 gt 0 gt 0 gt 0 gt 0 gt 1 gt 1 gt now test multiple writes ae oe Gs i ces 3G Gg YG 3Gy YG Ge SY se h C E Gs p C Ge Page 40 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt iji 1 gt 0 gt 0 gt 0 gt 0 gt 1 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 0
25. equ equ SMC_CSR6 SMC_CSR7 SMCBase 0x18 Chip Select 6 Register SMCBase 0x1C Chip Select 7 Register Parallel I O A Definintions equ equ equ equ equ equ equ equ PIOABase PIOA_PER PIOA_PDR PIOA_ODR PIOA_PDSR PIOA_IMR PIOA_ASR PIOA_BSR OxFFFFF400 base address PIOABase PIO Enable PIOABase 0x4 PIO Disable PIOABase 0x14 output disable PIOABase Ox3C Pin Data Status PIOABase 0x8 IRQ Status PIOABase 0x70 PIO Peripheral A Select PIOABase 0x74 PIO Peripheral B Select Parallel I O B Definintions equ equ equ equ Page 68 PIOBBase PIOB_PDR PIOB_ASR PIOB_BSR OxFFFFF600 base address PIOBBase 0x4 PIO Disable PIOBBase 0x70 PIO Peripheral A Select PIOBBase 0x74 PIO Peripheral B Select equ equ equ equ PIOB_PER PIOBBase PIOB_CODR PIOBBase 0x34 PIOB_OER PIOBBase 0x10 PIOB_SODR PIOBBase 0x30 Parallel I O C Definintions equ equ equ equ equ equ equ equ equ equ equ equ equ Page 69 PIOCBase OxFFFFF800 base address PIOC_PER PlOCBase PIO Enable PIOC_PDR PIOCBase 0Ox4 PIO Disable PIOC_ODR PlIOCBase 0x14 output disable PIOC_OER PIOCBase 0x10 output enable PIOC_CODR PIOCBase 0x34 clear output PIOC_PDSR PIOCBase 0x3C Pin Data Status PIOC_IMR PIOCBase 0Ox8 IRQ Status PIOC_IER PIOCBase 0x40 interrupt enable PIOC_ASR PIOCBase 0
26. return cur_status connection functions Page 417 tcp_connection_init Description This function initializes the TCP connection software Operation The shared variables are initialized and the LwIP TCP interface is initialized Then the interface is restarted Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables call_pcb changed set to NULL cur_status changed set to CALL_NO_CONNECTION Page 418 listener changed initialized Author Glen George Last Modified March 10 2011 void tcp_connection_init variables none currently there is no connection cur_status CALL_NO_CONNECTION call_pcb NULL no listener either listener NULL initialize the LwIP code tcp_init Page 419 just restart the connection tcp_connection_restart done with initialization return return tcp_connection_restart Description This function restarts the TCP connection This is useful when the link has changed For example when the IP address is changed Operation Any open connections are closed Then the status is reset and a listener is setup to listen for incoming Calls Page 420 Arguments None Return Value None Input None Output None Error Handling If there is an error
27. 3733 3744 3754 3764 3774 3783 3793 3802 3811 3821 3830 3838 3847 3856 3864 3872 3880 3888 3896 3904 3911 3919 3926 3933 3940 3947 3953 3960 3966 3972 3978 3984 3990 3995 4001 4006 4011 4016 4021 4026 4030 4035 4039 4043 4047 4051 4054 4058 4061 4064 4067 4070 4073 4075 4078 4080 4082 4084 4086 4087 4089 4090 4091 4092 4093 4094 4094 4095 4095 int sign sign of the sine wave based on quadrant int index index into the table reduce the angle to one cycle Page 290 angle SINE_RESOLUTION and make sure it is positive if angle lt 0 angle SINE_RESOLUTION find the sign of the sine wave if angle lt SINE_RESOLUTION 2 first two quadrants are positive sign 1 else third and fourth quadrants are negative sign 1 lastly get the table index note there is only one quadrant in the table so the index is a function of which quadrant we are in if angle SINE_RESOLUTION 4 amp 0x01 0 in quadrant or IIl go through table in normal order index angle SINE_RESOLUTION 4 else in quadrant II or IV go through table in reverse order index SINE_RESOLUTION 4 angle SINE_RESOLUTION 4 1 Page 291 now return the sine function only have one quadrant of function return sign sin_wave index Page 292 EERE KEEA EREERE
28. AUDIO_BUFLEN if there is a buffer to transmit need to discard it if xmit_available have a buffer dump it get_xmit_buffer break case CALL_CONNECTED are talking on the connection Page 275 check if there is a buffer to transmit if xmit_available buffer is available try sending it if tcp_connection_tx get_xmit_next_ptr AUDIO_BUFLEN actually sent it let buffer functions know get_xmit_buffer check if have room for a received buffer if rcv_available have room try to get a buffer if tcp_connection_rx get_rcv_next_ptr AUDIO _BUFLEN got the buffer so allocate it get_rcv_buffer break default some other status must have aborted call if there is a buffer to transmit need todiscard it if xmit_available have a buffer dump it get_xmit_buffer Page 276 break try to play and receive any buffers check if a receive buffer is available for recording into if rx_available have a receive buffer see if update is ready if update_rx get_rx_next_ptr it wanted the buffer actually allocate it get_rx_buffer check if a transmit buffer is available for playing if tx_available have a transmit buffer see if update is ready if update_tx get_tx_next_ptr it wanted the buffer actually allocate it get_t
29. Description This function determines whether or not there is an incoming call If someone is trying to connect with this phone TRUE is returned Operation The result of calling have_tcp_connection is returned Arguments None Return Value char TRUE is someone is trying to connect with us FALSE otherwise Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 8 2011 Page 262 char incoming _call variables none return whether or not there is a call return have_tcp_connection call_ connected Description This function determines whether or not the other end has connected with us If the connection has been established TRUE is returned Page 263 Operation The connection status is queried and TRUE is returned if there is a connection Arguments None Return Value char TRUE if the connection has been established FALSE otherwise Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 9 2011 char call_connected Page 264 variables none return whether or not have a connection return tcp_connection_status CALL_NO CONNECTION call management functions
30. LDR rO txaudiocount LDR r1 r0 CMP r1 AUDIO_BUFLEN compare with total size of audio buffer BNE Handle_Tx if buffer isnt full input normally BEQ TxBuff_Swap if it is full swap to backup buffer TxBuff_Swap switch from buffer 1 to buffer 2 LDR rO txneedbuf LDR r1 r0 CMP r1 TRUE BEQ TxDrop if already in buffer 2 drop data otherwise swap buffers normally LDR rO txaudiocount first reset number of bytes stored in buffer LDR r1 0x0 STR r1 r0 LDR rO txbuff1 set txbuff1 to contain the address of the next buffer Page 94 LDR r1 txbuff2 LDR r2 r1 STR r2 r0 LDR rO txneedbuf indicate that tx needs a new buffer LDR r1 TRUE STR r1 r0 B Handle_Tx then proceed to read and output data TxDrop out of data to transmit must send a blank LDR rO SSCO_THR LDR r1 0x0 STRH r1 r0 output a blank half word B CodecHandlerDone once sent function is done Handle_Tx first output next halfword in buffer LDR rO txbuff1 load base address of current buffer LDR r2 r0 address of buffer loaded LDR rO txaudiocount determine which halfword in the buffer should be output LDR r1 r0 Page 95 ADD r2 r2 r1 base address of buffer shifted by the number of bytes already read from tx buffer LDRH 10 r2 load the next halfword to output LSL rO VOLUME_CON_BITS set volume control ADD rO rO VOLUME_CON_VAL LDR r1 SSCO_THR STRH roO
31. None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision global elapsed_time elapsed_time PUSH r1 r2 save used registers LDR r1 elapsed_time_count first get value of elapsed_time_count LDR rO r1 LDR r2 0x0 then reset elapsed_time_count STR r2 r1 POP r1 r2 restore registers and return BX LR The Data Segment Page 236 data DRAM_count current refresh cycle number of DRAM word elapsed_time_count number of milliseconds since elapsed_time was last called word end Page 237 REEREETERACETEL ERR AR ERED ERA CALLE RA EEEE EERE ERE LE REL ESSE SESE Cee Ree E BUFFERS H General Definitions t7 Include File ia VoIP Telphone Project hi EE CS 52 PEEREAELERESE AREER ELA RARER ELEALAL REALE RALELE EL REE EE EEL EER LEER ERE EEE REA A This file contains the constant and structure definitions and function declarations for the buffer management functions for the VoIP Telephone defined in buffers c Revision History 6 6 06 Glen George Initial revision 5 26 08 Glen George Updated return types of buffer functions 2 28 11 Glen George Changed buffers to be short ints 16 bits instead of unsigned chars 8 bits 3 9 11 Glen George Added prototypes for get_xmit_next_ptr and get_rcv_next_ptr ny Page 238 ifndef __BUFFERS_H__ define __BUFFERS H__ library include files
32. and typedefs status types enum status STAT_IDLE system idle Page 465 STAT_OFFHOOK STAT_RINGING STAT_CONNECTING STAT_CONNECTED STAT_SETIP STAT_SETSUBNET STAT_SET_GW STAT_MEMSAVE STAT_MEMRECALL STAT_RECALLED NUM_STATUS key codes enum keycode KEYCODE_O KEYCODE_1 KEYCODE_2 KEYCODE_3 KEYCODE_4 KEYCODE_5 KEYCODE_6 KEYCODE_7 KEYCODE_8 KEYCODE_9 Page 466 lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt phone is off hook incoming call attempting to connect connected to remote phone setting the IP address setting the subnet address setting the gateway address saving an address to memory recalling an address from memory just recalled an address from memory number of status types lt 0 gt a wi KEYCODE_ESC lt ESC gt KEYCODE_BS lt Backspace gt KEYCODE_SEND lt Send gt KEYCODE_OFFHOOK Off Hook KEYCODE_ONHOOK On Hook KEYCODE_SETIP lt Set IP gt KEYCODE_SETSUBNET lt Set Subnet gt KEYCODE_SET_GW lt Set Gateway gt KEYCODE_MEMSAVE lt Memory Save gt KEYCODE_MEMRECALL lt Memory Recall gt KEYCODE_ILLEGAL other keys NUM_KEYCODES number of key codes key ty
33. display_memory_addr memloc all done adding the digit return the passed status return cur_status del_memDigit Page 400 Description This function handles a backspace key when a memory location number is being input It removes the last input digit from the current value of the memory location number If the current location is zero it is assumed that there are no more digits in the location number and the error handler is called and the key is ignored The function returns with the system status it was passed Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status same as current status Input None Output None Error Handling If the current location number is zero then there are no digits to delete in the location number and the key is ignored and the error handler is called with the error MEMORY_ADDRESS_UNDERFLOW Algorithms None Data Structures None Page 401 Shared Variables memloc changed updated to the new memory location number by deleting the lowest digit Author Glen George Last Modified June 3 2006 Df enum status del_memDigit enum status cur_status int key_value variables none are there any digits to delete if memloc 0 looks like there should be a digit to delete remove the last digit
34. end_call Send Enter set_IP set_subnet set_gateway save_mem _ recall_mem do_call start_IPEntry no_action do_answer no_action no_action Off Hook no_action no_action no_action no_action no_action start_IPEntry no_action end_call no_action end_call end_call On Hook no_action no_action no_action no_action no_action no_action start_IPEntry no_action start_IPEntry no_action no_action Set IP reset input no_action no_action no_action no_action set_IP start_IPEntry no_action start_IPEntry no_action no_action Set Subnet no_action reset_input no_action no_action no_action set_subnet start_IPEntry no_action start_IPEntry no_action no_action Set Gateway no_action no_action reset_input no_action no_action Page 374 set_gateway start_memLoc start_memLoc start_memLoc start_memLoc start_memLoc Memory Save no_action no_action no_action reset_input no_action start_memLoc start_memLoc start_memLoc start_memLoc no_action no_action Memory Recall no_action no_action no_action no_action reset_input start_memLoc no_action no_action no_action no_action no_action unknown key no_action no_action no_action no_action no_action no_action first initialize everything init_buffers initialize the rx tx buffers init_memory initialize saved IPs
35. just divide by 10 memloc 10 else Page 402 no digits to delete call the error handler process _error MEMORY_ADDRESS_UNDERFLOW display the new memory location number display_memory_addr memloc all done deleting the digit return the passed status return cur_status save_mem Description This function handles the lt Send Enter gt key when a memory location is being saved If the memory location number is valid it saves the current IP address even if it is zero at that memory location If the memory location Page 403 number is out of range 0 or greater than MEMORY_SIZE the error handler is called The function always returns with the status it had when the save state was entered if there was no error and with the passed state if there was an error Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status Input None Output None Error Handling If the current location number is zero or greater than MEMORY_SIZE the key is ignored and the error handler is called with the error BAD MEMORY_ADDRESS Algorithms None Data Structures None Shared Variables memloc accessed used to index the saved_IPs array saved_IPs changed current IP address is written to this array Page 404 Author Glen George Last Modified
36. move to state 1 move to state 2 move to read state 3 move to read state 4 move to read state 5 move to read state 6 move to read state 7 move to read state 8 return to idle state confirm idle state now test mixed reads and writes l aC V C P es aes l eG Gs L aC Ges Gg Gs l cea 3G GG ae 3Gy YG 3Gy Gs a ee C p cC C Page 43 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt iji 1 gt 1 gt 1 gt ijl 1 gt ijl 1 gt ijl 1 gt 1 gt 1 gt 0 gt 0 gt 1 m J 1 1 1 1 1 0 0 0 0 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 0 0 1 1 1 0 1 1 0 0 1 1 0 1 0 1 0 1 1 1 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 move to state 1 move to state 2 move to write state 3 move to write state 4 move to write state 5 move to write state 6 move to write state 7 move to write state 8 return to idle state confirm idle state move to state 1 move to state 2 move to read state 3 move to read state 4 move to read state 5 move to read state 6 move to read state 7 move to read state 8 return to idle state confirm idle state move to state 1 move to state 2 ay V C 2C ay Lt ay Lt aay Le Gs Gs L aC Gs L aC Gs i ce
37. 27 ipproc c 28 keyproc c 29 keyproc h 30 mainloop c 31 memproc c 32 tcpconn c 33 tcpconn h 34 voipdefs h LWIP CODE 35 lwipopts h Other LWIP code was unchanged and can be found in the included zip of all system code Page 62 PO COCO OCO CECE LOO O EOC EEE OL OLOL OEE ECEEE ELL EEE EEEEO CO CEO ECE CEEOL LOO ECEC ECE EEL LEE EEE EEEEEE armvoip inc General VOIP project constants Revision History 2012 2 6 Josh Fromm File Created 2012 2 7 Josh Fromm Constants added 2012 2 16 Josh Fromm Constants added 2012 3 7 Josh Fromm DRAM constants added 2012 3 29 Josh Fromm Comments updated PCO OCOEO ECO OCE CEL OL OEE EC ECECE OL EL EEE ECE EEL LLEECECEEEEO CO OCOEO ECE OCECECEC LOLOL OEE ECE EEE LEE ECEEEEEECEE equ IRQ_STACK_SIZE 0x80 memory space allocated to IRQ equ SVC_STACK_SIZE 0x80 memory space allocated to the stack equ TOP_STACK 0x20020000 last address in SRAM used as top of the stack Control Words equ MCKSTARTCON 0x1 value to write to mck at initialization Page 63 equ PLLARCON Ox200EBFO2 Value to write to PLL A control register to set clock value to 75 MHz equ MORCON OxFFO1 Value to write to main oscillator register equ PRCCLKCON 0x1 Value to write to enable processor clock equ MCKCON 0x00000102 Value to write to enable master clock equ NCSOCON 0x0000408C Value to write to chip select zero con
38. 3 3 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments Updated global ether_rx_available ether_rx_available PUSH r1 r2 r4 save used registers LDR r3 0x0 set counter value to 0 RBQP_scan LDR r0 RBQP load address of RBQP MOV r1 r3 load current counter value LSL r1 0x3 each chunk takes up 2 words 8 bytes so we must multiply by 8 ADD r0 r0 r1 add calculated to offset of RBQP LDR r2 r0 load value of RBQP at that address MOV r4 r2 save that value AND r4 r4 0x1 check if software owns this buffer CMP r4 0x1 BEQ buffer_found if so we found a filled buffer AND r2 r2 0x2 check if this is the last buffer Page 178 CMP r2 0x2 BEQ no_ buffer if this was the last buffer there is no available data ADD r3 r3 0x1 increment counter B RBQP_ scan repeat loop buffer_found MOV r3 rO set r3 to be the address of the filled buffer to return LDR rO TRUE indicate a buffer was found B ether_rx_available_done no_buffer LDR r0 FALSE indicate no buffer was found Bether_rx_available_done ether_rx_available_done POP r1 r2 r4 restore used registers BX LR return rO buffer received r3 payload address and r4 size of payload Page 179 ether_receive Description This function moves the data stored in the filled buffer indicated by filled_buffer_num into a pbuf The function returns the start address of that pbuf chain
39. 500ns eilei lerri tatti teri erilaiset kenik raitte erki NOOO NOOO NOOO MCK NCS3 o NRD o SMC3 SMC37 Setup cycles ao ag 15 0 O C PCK state 47 ste 5 tCR tW RASL iPO NRAS l t RAS CAS NCAS l tH CAS R l SU R CAS BH bea tPO tPD NWE l tSUIRA RAS PD tPS L iPHL p tH RAS RA oA ees mux 15 0 tPD mux 15 0 SMC34 tA RAS SMC33 Data 15 0 O Signal waveforms for a DRAM read Page 30 Signal Name Signal Description Signal Time ns tPD Propagation delay due to PLD 25 SMC 29 MCK Falling to NRD Active 6 8 tSU RA RAS Setup time from row address 0 to RAS tPSL Propagation delay due to 27 multiplexers td RAS CAS Minimum delay between RAS 75 and CAS signals tSU R CAS Setup time of NWE before 0 CAS tH RAS RA Hold time of row address 20 after RAS low tH RAS CA Hold time of column address 100 after RAS low tCR Read cycle time 260 tW RASL RAS low pulse width 150 tW CASL CAS low pulse width 75 tH CAS RAS Hold time of CAS after RAS 75 low tA CAS Delay between CAS low and 50 data valid tH CAS R Hold time from CAS high to 0 NWE invalid tH RAS R Hold time from RAS high to 10 NWE invalid tDIS Time from CAS high to data 0 invalid Explanation of signals and timings for a DRAM read The following diagram and table show and explain the signals and timings of a DRAM write
40. KEY_9 10 KEY_ESC 3 KEY_BACKSPACE 11 KEY_SEND 15 KEY_OFFHOOK 12 KEY_ONHOOK 14 KEY_SET_IP 16 KEY_SET_SUBNET 17 KEY_SET_GATEWAY 18 KEY_MEM_SAVE 19 KEY_MEM_RECALL 20 KEY_ILLEGAL 31 STATUS_IDLE 0 STATUS_OFFHOOK 1 STATUS_RINGING 2 STATUS_CONNECTING 3 Page 326 define define define define define define define define define endif STATUS CONNECTED 4 STATUS _SET_IP 5 STATUS_SET_SUBNET 6 STATUS_SET_GATEWAY 7 STATUS MEM_SAVE 8 STATUS_MEM_RECALL 9 STATUS_RECALLED 10 STATUS_ILLEGAL 11 AUDIO_BUFLEN 256 Page 327 EERE KEEA EREEREER RE REL ERA LET EE KE EEEE Le Te Te REEE EEE ae eT eee ee ee TE REE IPPROC a i IP Address Key Processing Functions 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE EE KE EE K E E E AE E E E E E E E RORE EE EEEE EE E EER EEE KEE EEE EKE RES E E EEK E This file contains the key processing functions for IP addresses for the VoIP Telephone Project These functions are called by the main loop of the system The functions included are add_IPDigit add a decimal digit to the input IP address clear_IPAddr clear the input IP address del_IPDigit delete the last input IP address decimal digit set_gateway set the gateway address set_IP set the IP address set_subnet set the subnet mask start_IPEntry start entering an IP address The local functions included are clr_IP_address clears the IP address
41. PMC_PCER enable tcO peripheral clock LDR r1 0x20000 Page 216 STR r1 LDR rO LDR r1 STR r1 LDR rO LDR r1 STR r1 LDR rO LDR r1 r0 AIC_SMR17 set timer 0 interrupt mode 0x60 r0 AIC_SVR17 set timer 0 interrupt to cause event handler to be called TimerOHandler r0 AIC_IECR enable PID17 interrupts 0x20000 STR r1 r0 LDR rO LDR r1 AIC_IDCR disable sytem interrupts to prevent problems 0x2 STR r1 r0 LDR rO LDR r1 TCO_CCR disable timer O so it can be set 0x1 STR r1 r0 LDR r0 LDR r1 Page 217 TCO_CMR cause clock to reset at compare with RC 0xC000 STR r1 r0 LDR rO TCO_IER set interrupt to generate on RC compare LDR r1 0x10 STR r1 r0 LDR rO TCO_RC set RC to cause an interrupt every millisecond for 75 Mhz clock speed LDR r1 0x927C STR r1 r0 LDR r0 TCO CCR dinitiate clock O LDR r1 0x5 STR r1 r0 LDR r0 DRAM_count set timer function counters to zero LDR r1 0x0 STR r1 r0 LDR rO elapsed_time_count initial elapsed time is 0 milliseconds STR r1 r0 POP r0 r1 restore registers and return BX LR Page 218 TimerOHandler Description This function is called every millisecond through a timer interrupt When called it increments the counters used to keep track of how many milliseconds have passed since elapsed_time has been called and how many milliseco
42. TRUE Page 222 STR r1 r0 POP r0 r1 r2 restore used registers LDMFD SP PC then return elapsed_time Description This function returns the number of milliseconds since it was last called Operation Each millisecond TimerOHandler increments elapsed_time_count This means that elapsed_time simply needs to return the value in that shared value and then reset it Arguments None Return Values rO milliseconds since function was last called Local Variables rO addresses r1 general purpose r2 general purpose Shared Variables elapsed_time_count Global Variables None Input None Output None Error Handling None Registers Changed None Page 223 Stack Depth 2 Words Algorithms None Data Structures None Known Bugs None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision global elapsed_time elapsed_time PUSH r1 r2 save used registers LDR r1 elapsed_time_count first get value of elapsed_time_count LDR rO r1 LDR r2 0x0 then reset elapsed_time_count STR r2 r1 POP r1 r2 restore registers and return BX LR The Data Segment Page 224 data DRAM_count current refresh cycle number of DRAM word elapsed_time_count number of milliseconds since elapsed_time was last called word end Page 225 PO COO CECE EEC OL OLL OEE ECECECE OL
43. WaitLoop2 wait a while to let clock stabilize SUB r1 r1 0x1 subtract 1 from the wait loop counter CMP r1 0x0 once counter is zero code can continue BNE WaitLoop1 if the counter is not zero keep waiting MCKR set the master clock to be PLLA divided by 2 LDR rO PMC_MCKR LDR r1 MCKCON STR r1 r0 ClocklnitStab check to make sure master clock has stabilized LDR rO PMC_SR LDR r1 r0 LDR r2 LOW_BIT_MASK AND rO r1 r2 determine whether clock has signal has stabilized CMP rO r2 check if stable Page 136 BNE ClocklnitStab if not stable then keep looping if low bit is set then clock has stabilized and boot can continue DRAM _Clock_Setup set up PA4 to be the frequency used by the DRAM controller LDR rO PA4_ VAL first relinquish control of PA4 to peripheral B LDR r1 PIOA_BSR STR rO r1 LDR rO PA4_VAL disable PA4 so it can output a clock LDR r1 PIOA_PDR STR rO r1 LDR r0 PMC_SCER_PA4 enable TCK1 LDR r1 PMC_SCER STR rO r1 LDR rO PMC_PCER_PIOA provide peripheral clock to PIOA LDR r1 PMC_PCER STR rO r1 LDR rO PCK1_VAL load control word of PCK1 low bit sets output clock to equal master clock Page 137 LDR r1 PMC_PCK1 load address of PCK1 control register STR rO r1 store the control word to set up PCK1 CS Initialization CE ECE OO ECOL ECE OMO ECE OE ECO E ECE EEE ECEOE EEE EEEEEEE CEE ECE EOE EEE EEE NCSInit LDR r0
44. attach the cable the red strip on the connection cable goes on the side with the red block Once code is downloaded and running the display should show the message Idle the vast majority of user interfacing is done through the 16 key keypad and LCD display of the system The function of each key on the keypad is listed in the following table It should be noted that the keypad has a shift key which changes the function of each of the keys Shift is toggled on and off through the same key and the keypad will stay shifted or unshifted until the shift key is pressed again Page 5 Unshifted Key Functions Key Description Key Name Key Function QZ 1 One The number 1 ABC 2 Two The number 2 DEF 3 Three The number 3 Black Circle Escape Resets any entered value to zero GHI 4 Four The number 4 JKL 5 Five The number 5 MNO 6 Six The number 6 PRT Shift Changes whether the keypad is shifted or not Shift status determines what the keys do PRS 7 Seven The number 7 TUV 8 Eight The number 8 WXY 9 Nine The number 9 Left Arrow Backspace Undoes the last entered number Page 6 REV Off hook Equivalent to picking up a standard telephone Being off hook causes the display to show the message Off Hook Once off hook a phone call can be placed by entering an IP address using the number keys Once an IP address is entered the call goes through once the Enter key
45. back up buffer STR rO r1 LDR ri rxneedbuf indicate a buffer is no longer needed LDR r2 FALSE STR r2 r1 Page 102 LDR rO TRUE set output to show that the buffer was taken B update_rx_done function can end update_rx_nobuf no update is needed LDR rO FALSE set return value to show no update was needed B update_rx_done update_rx_done restore registers and return POP r1 r2 BX LR The data segment data txbuff1 contains address of active transmit buffer word txbuff2 contains address of backup transmit buffer word rxbuff1 contains address of active receive buffer word rxbuff2 contains address of backup receive buffer Page 103 word txaudiocount number of bytes transmitted from current transmit buffer word rxaudiocount number of bytes moved into current receive buffer word txneedbuf whether a new transmite buffer is needed or not word rxneedbuf whether a new receive buffer is needed or not word end Page 104 PO COCO ECO CEEOL OOO EOC EEE OL OOL EEC ECEEECLLEELECEEEEEE CO CEO ECE CEEOL OOO EEC ECE ECE LLOEELECEEEEEELEEECOE audio s Initialization event handling and basic functions of VOIP audio Table of Contents 1 sscO_init Function called to initialize the registers needed for SSC to __ to function 2 call_start Initializes SSCO interrupts so that audio data can
46. be input and output 3 call_halt Ends SSCO interrupts so that no audio dataisinputor output 4 CodecHandler Called during every frame sync interrupt Inputs and filled or empty audio buffers 5 update_tx Checks whether a new buffer of audio data to transmit is needed outputs a half word of audio data The function also handles swapping of 6 update_rx Checks if a new buffer to store incoming audio data is needed Revision History 2012 2 24 Josh Fromm Initial Revision Page 105 2012 3 4 Josh Fromm Code updated to actually work 2012 3 29 Josh Fromm Comments updated PO OOO ECE CECE LOO O ECO ECECECECOLLOLOL EEE ECEEE ELL EEE ECEEEO CO OCECOC CECE CEL OLE EEC ECE EEL LEE EEE EE ECELEEECOE include at91rm9200 inc include armvoip inc include audio inc text arm align 2 Audio initialization ssc0_init Description sscO_init sets up the many registers needed for the CPUs synchronous serial controller to function properly sscO_ init also performs a hardware reset on the system s codec Operation Moves many control words into appropriate registers to set up the SSC and uses a wait loop to allow for an appropriate Page 106 hardware reset Arguments None Return Values None Local Variables rO contains addresses and control words r1 contains addresses
47. counters indicating how how many bytes in the current buffer have been input or output Arguments None O O O Q Return Values None Local Variables rO varies by process often used as address storage r1 varies by process often used as control word or data r2 values loaded from addresses Shared Variables rxaudiocount txaudiocount rxneedbuf txneedbuf txbuff1 txbuff2 rxbuff1 rxbuff2 Global Variables None Input Audio data from codec moved to buffer Output Outputs audio data from buffer to codec Error Handling None Registers Changed None Stack Depth 2 Page 90 Algorithms None Data Structures buffers located at rxbuff1 rxbuff2 txbuff1 txbuff2 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global CodecHandler CodecHandler input or output the next halfword of data SUB LR LR 4 first correct systems pipeline STMFD SP LR PUSH r0 r1 r2 RxFullCheck if buffers are full swap them or drop data LDR rO rxaudiocount LDR r1 r0 CMP r1 AUDIO_BUFLEN compare to the total size of a buffer BNE Handle_Rx otherwise read and write next byte Page 91 BEQ RxBuff_Swap RxBuff_Swap active buffer is full and must be swapped with backup LDR rO rxneedbuf
48. include at91rm9200 inc Page 142 include armvoip inc include display inc text arm align 2 display initialization initializes the system s display according to the steps listed in the optrex manual displayInit Description displaylnit runs the necesarry procedure for the system s display module to function properly Operation displaylnit writes various values to the display module and employs wait loops in between to meet the requirements for initializing the display Note that the values written to the display in this function are defined in the Optrex manual and should not be changed Arguments None Page 143 Return Values None Local Variables rO contains addresses and control words r1 contains addresses and control words r2 contains addresses and control words Shared Variables Last_Status Global Variables None Input None Output clears display module and displays a blinking cursor Error Handling None Registers Changed None Stack Depth 4 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision 2 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated Page 144 global displaylnit displaylnit PUSH r0 r1 r2 LR save all used registers LDR
49. initialize the IwIP code if it is being used ifndef NO_LWIP init_networking endif Page 375 tcp_connection_init initialize the TCP connection reset timing reset elapsed timer and no time yet elapsed_time timeout 0 display the initial status display_status xlat_stat cur_status infinite loop processing input while TRUE handle networking status changes if cur_status STAT_IDLE amp amp incoming call have an incoming call change to ringing state cur_status STAT_RINGING and display the incoming call IP Address display_IP get_calling_IP else if cur_status STAT_RINGING amp amp incoming_call no more incoming call stop ringing cur_status STAT_IDLE Page 376 else if cur_status STAT_CONNECTING amp amp call_connected have connected to the remote phone cur_status STAT_CONNECTED need to start the call start_call else if cur_status STAT_CONNECTED we are connected continue processing the call process _Call now check for keypad input if key_available have keypad input get the key key key_lookup numeric_priority cur_status execute processing routine for that key cur_status process_key key_type key cur_status cur_status key_value key Page 377 finally if the status has changed display the new
50. int true to indicate numeric keys have precedence Return Value enum keycode type of the key input on keypad Input Keys from the keypad Output None Error Handling Invalid keys are returned as KEYCODE_ILLEGAL Algorithms The function uses arrays to lookup the key types Data Structures Arrays of key types versus key codes Page 380 Global Variables None Author Glen George Last Modified June 3 2006 Df static enum keycode key_lookup int numeric variables const static enum keycode nnkeycodes array of keycodes for non numeric precedence order must match keys array exactly KEYCODE_ESC lt ESC gt KEYCODE_BS lt Backspace gt KEYCODE_SEND lt Send gt KEYCODE_OFFHOOK Off Hook KEYCODE_ONHOOK On Hook KEYCODE_SETIP lt Set IP gt oh KEYCODE_SETSUBNET lt Set Subnet gt KEYCODE_SET_GW lt Set Gateway gt KEYCODE_MEMSAVE lt Memory Save gt Page 381 KEYCODE_MEMRECALL lt Memory Recall gt KEYCODE_0 lt O gt KEYCODE_1 lt 1 gt KEYCODE_2 lt 2 gt KEYCODE_3 lt 3 gt KEYCODE_4 lt 4 gt KEYCODE_5 lt 5 gt KEYCODE_6 lt 6 gt KEYCODE_7 lt 7 gt KEYCODE_8 lt 8 gt KEYCODE_9 lt 9 gt KEYCODE_ILLEGAL entry needed for illegal codes const static enum keycode nkeycodes array of keycodes for numeric precedence
51. interfac h include voipdefs h include keyproc h include callutil h include error h Page 389 Initial revision Changed start_memLoc recall_mem and save_mem to remember the state the phone was in before the IP address was saved or recalled and restore that state if necessary locally global variables static unsigned int memloc the current memory location static unsigned long int saved_IPs MEMORY_SIZE 1 array of saved IP addresses static enum status old_status status before a memory operation init_memory Description This function initializes the memory system It first checks if location O has the magic value in it If so the system is already initialized and there is nothing to do If the magic value is not at location O then it is written there and the other saved memory values are set to 0 This is done so the memory is maintained between resets as long as power doesn t fail Page 390 Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables saved_IPs changed initialized to all O s Author Glen George Last Modified June 3 2006 void init_memory variables int i general loop index Page 391 check if memory is already initialized if saved_IPs O MAGIC_IP memory is not initialized need
52. is answering change status cur_status CALL_CONNECTED break case R ringing packet the phone is ringing on the other end cur_status CALL_RINGING break case B busy packet the phone is busy on the other end cur_status CALL_BUSY break case D data packet have data copy it into the buffer for i 0 i lt AUDIO_BUFLEN i copy a word into the data buffer rx_data i unsigned char packet gt payload 2 i 1 lt lt 8 unsigned char packet gt payload 2 i 2 amp OxFF have data now have_rx_data TRUE Page 451 break default unknown packet report an error this shouldn t happen process_error NETERR_UNKNOWN_PACKET break acknowledge that we ve gotten the payload tcp_recved conn packet gt len done with the packet release it pbuf_free packet have processed the received data return with the passed error code return err Page 452 busy_sent Description This function handles the busy packet being successfully sent Operation The connection is closed while watching for an error Arguments arg void not used conn struct tcp_pcb protocol control block for the connection over which the busy packet was sent len u16_t number of bytes sent ignored Return Value err_t error code for handling the data being sent alway
53. is pressed When a call is being received which causes the message Ringing to be displayed pressing off hook answers the phone call Zero The number 0 DEP On Hook This key returns the phone from an Off Hook status to Idle Pressing this key is equivalent to hanging up a phone ENT Enter Enter is used to finalize key functions Off Hook Set IP Set Subnet Set Gateway Memory Save and Memory Recall Page 7 Shifted Key Functions Key Description Key Name Key Function QZ 1 Set IP When pressed Set IP allows the user to enter a series of numbers of the form XXX XXX XXX XXX Where any set of xxx does not exceed 255 The display will show the message Set IP with the currently entered IP address displayed below it The entered value will become the phone s new IP address which is what other phones will enter to call the user s phone It should be noted that to enter the numbers the shift key must be pressed To exit Set IP at any time simply press the Set IP key again Once the desired IP address is shown on the display pressing the enter key finalizes the function ABC 2 Set Subnet Functions the same way as Set IP but instead sets the phone s subnet The display will show the message Set Subnet DEF 3 Set Gateway Functions the same was as Set IP but instead sets the phones Gateway The display wi
54. is that the call is not connected yet last_status CALL_NO_CONNECTION the ring and busy timer starts over for those tones ring_busy_timer 0 done setting up the call return return Page 269 connect_incoming Description This function connects to an incoming call Operation It calls the TCP connection function to answer the call It then initializes the buffer and audio code to start the call Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables last_status changed set to CALL_NO_CONNECTION Author Glen George Last Modified March 9 2011 Page 270 void connect_incoming variables none answer the call tcp_connection_answer reset the buffers for a new call reset_rx_buffer reset_tx_buffer start the audio portion of the call Note buffer had better be available now call_start get_rx_buffer the prior call status is that the call is not connected yet Page 271 last_status CALL_NO_CONNECTION done setting up the call return return process call Description This function processes a continuing call If there are buffers to play and the update function is ready a buffer is passed If there are buffers to fill and the update function is ready a buffer is passed
55. millisecond for 75 Mhz clock speed LDR r1 0x927C STR r1 r0 LDR r0 TCO CCR dinitiate clock O LDR r1 0x5 STR r1 r0 LDR r0 DRAM_count set timer function counters to zero LDR r1 0x0 STR r1 r0 LDR rO elapsed_time_count initial elapsed time is 0 milliseconds STR r1 r0 POP r0 r1 restore registers and return BX LR Page 230 TimerOHandler Description This function is called every millisecond through a timer interrupt When called it increments the counters used to keep track of how many milliseconds have passed since elapsed_time has been called and how many milliseconds have passed since DRAM was used to refresh the systems DRAM Each of these counts is incremented by one when the function is called The function also reads from 1 4th of the DRAM to keep that section refreshed Operation TimerOHandler first increments elapsed_time_count by 1 Next TimerOHandler determines which address of DRAM to begin reading at by multiplying the value in DRAM_count by the number of columns that are read each millisecond TimerOHandler then reads from the calculated addresses of DRAM Finally TimerOHandler checks if the value in DRAM_count has reached QB B HB QB QB amp its maximum value and sets it back to 0 if it has Arguments None Return Values None Local Variables rO addresses r1 control words Shared Variables DRAM_count elapse
56. needed Page 126 Bupdate_tx_done function is done update_tx_nobuf a new buffer is not needed LDR rO FALSE set return value to indicate an update was un needed Bupdate_tx_done function is done update_tx_done pop registers and return POP r1 r2 BX LR update_rx new_buffer_addr Description update_rx checks whether a new buffer to store incoming audio data in needed A buffer is needed when one or both of the stored buffers has been filled with audio data If this is the case the function accepts the passed buffer address and returns true If no buffer is needed the function returns false Operation lupdate_tx checks the statuses of shared variables to determine whether a new buffer is needed then updates Page 127 shared variables to indicate a new buffer has been accepted or does nothing to indicate no new buffer has been accepted Arguments rO address of available receive buffer Return Values rO TRUE if passed buffer was accepted FALSE if not Local Variables rO contains addresses and variable values r1 contains addresses and variable values r2 contains addresses and variable values Shared Variables rxneedbuf rxbuff2 Global Variables None Input None Output None Error Handling None Registers Changed r0 Stack Depth 2 Algorithms None Data Structures buffer stored at address i
57. of the CPU such as Ethernet with the CPU s EMAC controller The CPU runs code located on the SRAM that dictates how the CPU should interact with other peripherals ROM The read only memory of the system is used to store the code that runs the CPU runs off of On boot up assuming a functional boot up sequence the code located on the ROM is transferred to the SRAM where the system will read from SRAM The static random access memory of the system is used to store the code used to run the system the variables accessed by the code and buffers used to store information such as incoming and outgoing Ethernet data DRAM Controller The dynamic random access memory controller is used to interact with the system s DRAM The DRAM controller is needed for the system to properly access memory in DRAM DRAM The system s DRAM is used to store incoming and outgoing audio buffers which are input and output from the codec Keypad The keypad is used as user interface with the system The keypad interacts only with a debouncer scanner chip that then interacts with the CPU Display The display is used to provide information to the user Ethernet The Ethernet block is used to take in and output data over the internet It interacts with the EMAC controller of the CPU Codec The codec provides sound control for the system The codec interacts directly with the microphone input and speaker output of the system and relays information to f
58. or not there was an error if err had an error return ERR_IF return ERR_IF else no error return ERR_OK return ERR_OK Page 320 REEREET ERLE EEL LESA RE REL TRALEE TRS KE EEEE CEL SCE TA REEE EEE EEE EE REARS CEE ERE ES ETHERNET H Ethernet Interface Functions Include File ia VoIP Telephone Project hi EE CS 52 2 EERE ELEEEEE EA RERE ELE RARERELEALAL EREET EEREE EERTE REESE ERLE EAE ERE RE EEE A This file contains the constant and structure definitions and the function declarations for the ethernet interface low level driver functions for the VoIP Telephone Project Revision History 6 11 09 Glen George Initial revision 6 12 09 Glen George Fixed directory for netif h 3 10 11 Glen George Fixed value of TCP_TIMEOUT Page 321 make sure the file isn t already included ifndef _ ETHERNET_H__ define __ETHERNET_H__ library include files include Iwip pbuf h include Iwip netif h include Iwip err h local include files none constants define TCP_TIMEOUT 250 TCP timeout in ms Page 322 structures unions and typedefs none function declarations void ethernetif_input void driver input err_t ethernetif_init struct netif driver initialization err_t ethernetif_output struct netif struct pbuf driver output void init_networking
59. the ring tone to 500 Hz modulated by 20 Hz Page 251 library include files none local include files include interfac h Hinclude voipdefs h include callutil h include buffers h include tcpconn h include error h local function declarations static void ring _fill short int p int size _ fill buffer w ring tone static void busy_fill short int p int size fill buffer w busy tone static int sine _wave long int angle compute sine function Page 252 locally global variables IP address of the other end static unsigned long int calling IP name of the other end static char calling name MAX_NAME_LEN the lagged status of the call used to check for changes static enum tcp_conn_status last_status ring busy timer static unsigned long int ring _busy_timer mutators accessors get_calling IP Page 253 Description This function returns the IP address of the other end of the call Operation The value of the shared variable calling _IP is returned Arguments None Return Value unsigned long int the IP address of the other end of the call either who is calling or who was called Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables calling _IP accessed value to return Author Glen George Las
60. to Output Delay 120 tOH Output Hold Time from 0 Addresses tPLH Propagation time due to 3 3 buffer low to high tOE Delay between active read 6 and valid data tACS Access delay 12 SMC 33 Data Setup Time before NRD 7 5 High SMC 34 D0 D15 in Hold after MCK 1 7 Falling Page 23 Explanation of ROM read signals and timings Display This subsection covers the signals and timings associated with the system s display The schematic for the display of the system can be found on page 4 titled ARM Display in the schematics section The system uses a Microtips NMTC S24200XRGHS LCD display module The display is connected to the board by a 20 pin DIP that a ribbon cable is attached to The board layout shown at the beginning of this section shows which way the red part of the cable should face once inserted The display module has its own controller which significantly simplifies CPU interaction with the display Because the enable signal on the display controller is active high while other enables in the system are active low most notably NCS2 U1 is used to invert NCS2 and outputs the signal E to the display It should be noted that when interacting with the display the CPU uses 42 wait states and 3 address to chip select cycles Following is a diagram showing the signals and timings that are needed for the CPU to interact with the display module 100ns Ops 100ns 200ns 300ns 400ns 500ns 600ns 700ns 800ns 900ns Pirrilirool
61. to no connection have_rx_data changed set to FALSE Author Glen George Last Modified March 10 2011 sf void check_for_close Page 440 variables none check if there is a connection and it is now closed if call_pcb NULL amp amp call_pcb gt state CLOSED have a closed connection close it on this end too if tcp_close call_ pcb ERR_OK error closing the connection report it process error NETERR_CLOSE there is no longer a connection cur_status CALL_NO_CONNECTION call_ pcb NULL and no data have_rx_data FALSE done checking if the connection is closed return return Page 441 callback functions handle_connection Description This function handles a connection being successfully made Operation The status is changed to reflect we are trying to connect actual call not TCP connection and the receive data handler is setup for the connection Arguments arg void not used conn struct tcp_pcb protocol control block for the connection err err_t error code for the connection Return Value err_t error status the passed error code Page 442 Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables call_pcb changed set to the passed connection cur_status changed changed to indicate trying to e
62. words Shared Variables DRAM_count elapsed_time_count Global Variables None Input None Output None Page 227 Error Handling None Registers Changed None Stack Depth 2 Words Algorithms None Data Structures None Known Bugs None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision 3 29 2012 Josh Fromm Comments Updated global TimerOlnit TimerOlInit PUSH rO r1 save used registers LDR rO DRAM_START first write to beginning of dram this helps stabilize the dram for some reason LDRB r1 0x12 STRB r1 r0 LDR rO PMC_PCER enable tcO peripheral clock LDR r1 Ox20000 Page 228 STR r1 LDR rO LDR r1 STR r1 LDR rO LDR r1 STR r1 LDR rO LDR r1 r0 AIC_SMR17 set timer 0 interrupt mode 0x60 r0 AIC_SVR17 set timer 0 interrupt to cause event handler to be called TimerOHandler r0 AIC_IECR enable PID17 interrupts 0x20000 STR r1 r0 LDR rO LDR r1 AIC_IDCR disable sytem interrupts to prevent problems 0x2 STR r1 r0 LDR rO LDR r1 TCO_CCR disable timer 0 so it can be set 0x1 STR r1 r0 LDR r0 LDR r1 Page 229 TCO_CMR cause clock to reset at compare with RC 0xC000 STR r1 r0 LDR rO TCO_IER set interrupt to generate on RC compare LDR r1 0x10 STR r1 r0 LDR rO TCO_RC set RC to cause an interrupt every
63. 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 1 0 1 move to write state 4 move to write state 5 move to write state 6 move to write state 7 move to write state 8 return to idle state confirm idle state move to state 1 move to state 2 move to write state 3 move to write state 4 move to write state 5 move to write state 6 move to write state 7 move to write state 8 return to idle state confirm idle state move to state 1 move to state 2 move to write state 3 move to write state 4 C 0 O gt 0 O O0 0 0 0 1 move to write state 5 C 0 O gt 0 O O 0 0 1 0 move to write state 6 C 0 O gt 0 O O 0 0 1 1 move to write state 7 c 0 O gt 1 1 0 0 0 0 0 move to write state 8 c 1 1 gt 1 1 1 1 0 0 0 return to idle state c 1 1 gt 1 1 1 1 0 0 0 confirm idle state c 0 O gt 1 1 1 1 1 1 1 move to state 1 c 0 O gt 0 1 1 1 0 0 0 move to state 2 c 0 O gt 0 1 0 0 0 0 0 move to write state 3 c 0 O gt 0 O O 0 1 0 1 move to write state 4 c 0 O gt 0 O O 0 0 0 1 move to write state 5 C 0 O gt 0 O O 0 0 1 0 move to write state 6 C 0 O gt 0 O O 0 0 1 1 move to write state 7 c 0 O gt 1 1 0 0 0 0 0 move to write state 8
64. 006 void set_calling_IP unsigned long int ip variables none Page 258 set the calling IP address calling _IP ip done return return set_calling_name Description This function sets the name of the other end of the call to a copy of the passed value Operation The shared variable calling name is set to the passed value The passed string is copied character by character with care taken to not overwrite the buffer Arguments name const char pointer to the new value for the name of the other end of the Page 259 call either who is calling or who was Called Return Value None Input None Output None Error Handling If the passed string is longer than the buffer for the name it is truncated Algorithms None Data Structures None Shared Variables calling name changed changed to passed value Author Glen George Last Modified March 8 2011 void set_calling_name const char name variables int i general loop index Page 260 copy the passed string up to the end of the string or maximum length for i 0 i lt MAX_NAME_LEN 1 amp amp namefi 0 i calling _name i name i lt null gt terminate the string calling _name i 0 done copying the name return return status functions incoming _call Page 261
65. 0x124 Interrupt Disable Command equ AIC_ICCR AICBase 0x128 Interrupt Clear Command equ AIC_EOICR AlCBase 0x130 End of Interrupt Command Power Management Controller Definitions equ PMCBase OxFFFFFCOO base address equ PMC_SCER PMCBase 0x0 System Clock Enable equ PMC_PCER PMCBase 0x10 Peripheral Clock Enable equ PMC_MOR PMCBase 0x20 Main Oscillator register equ PMC_PLLBR PMCBase 0x2C PLLB Control equ PMC_PLLAR PMCBase 0x28 PLLA Control equ PMC_MCKR PMCBase 0x30 Master Clock equ PMC_PCKO PMCBase 0x40 Programmable Clock 0 equ PMC _PCK1 PMCBase 0x44 equ PMC_SR PMCBase 0x68 Status Register Serial Synchronous Controller O Definitions equ SSCOBase OxFFFDOOOO base address Page 71 equ equ equ equ equ equ equ equ equ equ equ SSCO_CR SSCO_CMR SSCO_RCMR SSCO_RFMR SSCO_TCMR SSCO_TFMR SSCO_RHR SSCO_THR SSCO_SR SSCO_IER SSCO_IDR SSCOBase 0x0 SSCOBase 0x4 Control Clock Mode SSCOBase 0x10 Receive Clock Mode SSCOBase 0x14 Receive Frame Mode SSCOBase 0x18 Transmit Clock Mode SSCOBase 0x1C Transmit Frame Mode SSCOBase 0x20 Receive Holding SSCOBase 0x24 Transmit Holding SSCOBase 0x40 Status SSCOBase 0x44 Interrupt Enable SSCOBase 0x48 Interrupt Disable Timer Counter 0 Definitions equ equ equ equ equ equ equ Page 72 TCOBase
66. 3 busy_fill Description This function fills the passed buffer of the passed size with a busy tone A busy tone is a 600 Hz signal modulated by a 120 Hz signal at 13 dBm The tone is on for 0 5 seconds and off for 0 5 seconds Operation A static shared variable is used to keep track of the position in the waveform pattern when the function is called The function computes the the waveform pattern and writes it to the buffer Arguments p short int pointer to buffer to be filled with data size int size of the passed buffer Return Value None Input None Output None Page 284 Error Handling None Algorithms None Data Structures None Shared Variables ring_busy_timer changed updated on each call Author Glen George Last Modified March 16 2011 Ph static void busy_fill short int p int size variables long int sig 600 value of the 600 Hz tone signal long int sig 120 value of the 120 Hz modulating signal long int angle angle to find the sine for int i general loop index Page 285 fillthe buffer with data for i 0 i lt size i check if past the end of the tone silent portion if ring_busy_timer gt BUSY_TONE_TIME BUSY_SILENT_TIME timer has wrapped reset it ring _busy_timer 0 get the angle for both waveforms with a factor of 5 calculation is complicated to keep it
67. 56 MB OXFFFA 4000 TC3 TC4 TCS 16 KB 256 MB OXFFFA 8000 OXFFFF F000 OXFFFB 0000 OXFFFF F200 16 KB OXFFFB 4000 OXFFFF F400 16KB PIOA OXFFFB 8000 OXFFFF F600 Undefined 1518 MB 16 KB PIOB OXFFFB C000 OXFFFF F800 16 KB OXFFFC 0000 OXFFFF FAQO USARTO 16 KB PIOD OXFFFC 4000 OXFFFF FCOO OXEFFF FFFF USARTI1 16 KB oxFon0 0000 Internal Peripherals 256 MB OXFFFC 8000 OXFFFF FD00 OXFFFF FFFF USART2 16 KB ST OXFFEC Cood OXFFFF FEOO USART3 16KB RTC OXFFFD 0000 OXFFFF FFOO 16 KB MC OXFFFD 4000 OR EEE ERF SSC1 16 KB OXFFFD 8000 SSC2 16 KB Reserved 16 KB SPI 16 KB Memory mapping with expanded addresses Page 46 ARM Board Layout EE52 Josh Fromm 8300mil c2 Bh Be oe gonane 10 uf lout Eeee n E A ehd Se 5 bocoocooocooocooo ecoooooceoceso D o ooooo0oooof 00000000006 Jers pO _ lt ees 5572 Gr ound u o 5 xi x2 eoo0o0000 92 768 KHe SAAT eee eat A EE CS 62 ATS ARN Prototyping Boar Ground O 12A6A0 Glen George O te 3900mi 1 k iS Page 47 EEPROM ROM SRAM and Buffers When the system first powers on or after the CPU receives an active reset signal the CPU enters its boot up sequence In the boot up sequence the CPU checks to see whether a suitable EEPROM is connected via two wire interface It checks by searching for a stored vector on the EEPROM The system s EEPROM U22 is connected to the CPU s two wire interface and c
68. 6 Description This function handles any errors from a TCP connection Operation The process_error function is called with NETERR_GENERAL Arguments arg void not used err err_t error code for the error ignored Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 10 2011 static void error_handler void arg err_t err Page 457 variables none inform the system there was a general network error process_error NETERR_GENERAL nothing else to do return return Page 458 FERRET ERELE EA EEE ERER REL ERAT LE TES KE EEEE EEE AE EEEE RAL CTA ATTA eee CET ER ee S TCPCONN H i TCP Interface Functions Include File ia VoIP Telephone Project EE CS 52 oy JETEREEEEERRAEEEREEEEKEEEEEERREKEEEEEEEEREERE ERE RESET REESE EES RARE ERE EEE EE This file contains the constants structures and function prototypes for the TCP interface functions for the VoIP Telephone Project which are defined in tcpconn c Revision History 3 10 11 Glen George Initial revision ifndef I__TCPCONN_H_ Page 459 define _ TCPCONN_H__ library include files none local include files none constants none structures unions and ty
69. 9 2012 Josh Fromm Comments updated global CodecHandler CodecHandler input or output the next halfword of data SUB LR LR 4 first correct systems pipeline STMFD SP LR PUSH r0 r1 r2 RxFullCheck if buffers are full swap them or drop data LDR rO rxaudiocount LDR r1 r0 CMP r1 AUDIO_BUFLEN compare to the total size of a buffer BNE Handle_Rx otherwise read and write next byte Page 118 BEQ RxBuff_Swap RxBuff_Swap active buffer is full and must be swapped with backup LDR rO rxneedbuf if this is the second buffer data must be dropped LDR r1 r0 CMP r1 TRUE if neebuf is true then a backup buffer isnt provided BEQ RxDrop otherwise switch buffers normally LDR rO rxaudiocount first reset count of bytes written to buffer LDR r1 0x0 STR r1 r0 LDR rO rxbuff1 set rxbuff1 to contain the address of the next buffer LDR r1 rxbuff2 LDR r2 r1 STR r2 r0 LDR rO rxneedbuf indicate that rx needs a new buffer LDR r1 TRUE STR r1 r0 B Handle_Rx then proceed to read and output data Page 119 RxDrop ran out of buffer space must drop data LDR r0 SSCO_RHR read from receive register and do nothing with data LDRH r1 r0 B TxFullCheck then go on to handle tx Handle_Rx add next received byte to buffer LDR rO rxbuff1 first determine where next received byte will be stored LDR r2 r0 value of base address of buffer loaded LDR rO rxaudiocount bas
70. ARM VOIP Telephone Manual and System Information Josh Fromm Page 1 Index 1 Basic System Description Page 3 2 User Manual Page 4 3 System Hardware Overview Page 13 4 Hardware Manual Page 16 5 Detailed Description of Hardware Page 46 6 Software Manual Page 54 7 System Code Page 60 Page 2 Basic System Description The system is a voice over internet protocol VOIP telephone that is theoretically capable of placing a phone call over the internet to the IP address of a compatible VOIP telephone Due to the exposed components of the system the VOIP telephone must be handled carefully Birds eye image of VOIP telephone Page 3 User Manual The VOIP telephone is initialized by first supplying power through a 5 12 Volt transformer The transformer is plugged in as seen in the following image How to attach a power cable If power is being properly supplied a blue LED will turn on to indicate the system is powered Image of power LED Page 4 Once the system is powered code must be downloaded before the VOIP phone will function This is done by connecting a wiggler board to JTAG connection area seen below The wiggler board can then be connected to the parallel port of a computer which can be used to download code through a debugger such as OCD Commander t nouryerrree if Image showing JTAG connection zone Note that the red block indicates how to properly
71. C Write Cycle Minimum Time 12 tDW Data Valid to End of Write 9 Requirement tWR Address Hold from End of 12 Write SMC 20 Data Out Valid before NWR 27 High Signal Name Signal Description Signal Time ns SMC 13 MCK Rising to NWR Inactive 7 2 SMC 16 NWR High to NLB AO Change 3 7 SMC 22 Data Out Valid after NWR 5 46 High ROM Explanation of SRAM write signals and timings The system uses an AMD Am29LV040B 512K x 8 bit ROM chip The CPU reads from the ROM only during its boot up cycle When booting up the system will access all the memory in ROM and move it into SRAM Once running the system does not access ROM The schematic for the ROM of the VOIP system can be found along with other schematics in this section on page 1 of the included schematics Following is a diagram of the signals and timing of a ROM read It should be noted that when interacting with the ROM the CPU is set to perform byte reads with 18 wait states Page 21 Ops 50ns 100ns 150ns 200ns 250ns 300ns 350ns rilirrilirialirrilirriliriilirrilirrilirialiriitirraliriatiriitiriidiriitiad MCK NCS0 BNCSO Addresses NRD DataRead Ty Diagram showing signals and timings of a ROM read Note that DataRead is valid data Page 22 Signal Name Signal Description Signal Time ns tRC Read Cycle Time 120 tOE Output Enable to Output 50 Delay tCE Chip Enable to Output Delay 120 tACC Address
72. DD r1 r1 ASCII_ZERO convert value to ascii STRB r1 r0 output value MOV r0 r4 set numerator to be current power of 10 LDR r1 OxA set denominator to be 10 BL Divide divide to find new power of 10 CMP r1 0x0 if division returned zero then we are done with the function BEQ display_Main_Done MOV r4 r1 otherwise store that value and repeat B display_IP_Main display_Main_Done CMP r2 0x0 determine if this was the last byte if so no ellipse is needed BEQ display_IP_Done jump to finished Page 150 SUB r2 r2 BITSPBYTE then subtract the number of bits in a byte from number of shifts remaining BL DispBusyCheck check to make sure display is ready LDR rO DISPLAY_WRITE otherwise write an ellipse to the display LDRB r1 ASCII_ELLIPSE STRB r1 r0 B display_IP_Shift then begin to output next byte packet of IP display_IP_Done all characters have been displayed pop registers and return LDR rO Last_Status reset last status LDR r1 OxFF STR r1 r0 POP r0 r1 r2 r3 r4 r5 LR BX LR display_memory_addr Description This function takes a 32 bit input in rO and displays the equivalent memory address in hex on the VOIP systems display Operation The function divides the register by the highest possible value of 16 256 initially The remainder of this division is converted Page 151 to ASCII and output to the display Then the register containing the powe
73. DE OxFFFBCO6C Code Error EMAC_SQEE OxFFFBCO7C SQE Test Error EMAC_TSR OxFFFBCO14 Transmit Status EMAC_DRFC OxFFFBCO80 Discarded RX Frame General Definitions equ equ equ equ equ WORD_SIZE 0x4 HALFWORD_SIZE 0x2 BYTE_SIZE 0x1 BITSPBYTE 0x8 BITSPHW 0x10 Page 75 size of a word in bytes size of a halfword in bytes size of a byte in bytes number of bits in a byte number of bits in a half word audio This fil inc e contains the constants used by the functions that run the VOIP system s audio input and output Revision History 2012 2 24 Josh Fromm Initial Revision SSC re equ equ equ equ equ equ equ equ equ equ Page 76 gister definitions SSCO_CR_VAL 0x101 allow data to be transmitted and received SSCO_CMR_VAL 0x12 divides masterclock to get as close to 2 Mhz as possible SSCO_RCMR_VAL 0x7F000105 set period to be one frame sync every 256 cycles Data shifted in on falling edge SSCO_RFMR_VAL Ox8F MSSB first data length is half words SSCO_TCMR_VAL 0x7F000424 period set to 256 cycles data shifted out on rising edge SSCO_TFMR_VAL Ox20008F data length is half words MSB first frame sync type is positive pulse SSCO_IER_VAL Ox400 value to write to enable frame sync interrupts SSCO_IDR_VAL 0x400 value to write to disable frame sync interrupts AIC_SMR14_VAL 0x07 ssc0 is given high interrupt priorit
74. Digit enum status int add a digit to the IP address del_IPDigit enum status int delete a digit from the IP address set_IP enum status int set the IP address set_gateway enum status int set the gateway address set_subnet enum status int set the subnet mask start_memLoc enum status int starting entering a memory location clear_memLoc enum status int clear the memory address add a digit to the memory address add_memDigit enum status int del_memDigit enum status int delete a digit from the memory address recall_mem enum status int recall an address from memory save_mem enum status int save an address to memory do_answer enum status int answer an incoming call do_call enum status int start an outgoing call end_call enum status int end a call endif Page 365 EERE KEEA EREEREER RE REL ERA LET EE KE EEEE Le Te Te REEE EEE ae eT eee ee ee TE REE MAINLOOP i Main Program Loop sa 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE EE KE EE K E E E AE E E E E E E E RORE EE EEEE EE E EER EEE KEE EEE EKE RES E E EEK E This file contains the main processing loop background for the VoIP Telephone Project The only global function included is main background processing loop The local functions included are key_lookup get a key and look up its keycode The locall
75. ER RE REL ERA LET EE KE EEEE Le Te Te REEE EEE ae eT eee ee ee TE REE CALLUTIL H i Calling Utility Functions Include File ia VoIP Telephone Project hi EE CS 52 By JELEKET EEE RRE ALLER EEKE EEE RE EE EREE EEE EEEE EEE EEEE REESE ELLER EERE E EE EEE KKE This file contains the constants and function prototypes for the calling utility functions for the VoIP Telephone Project which are defined in callutil c and memproc c Revision History 6 3 06 Glen George Initial revision 3 9 11 Glen George Made numerous changes to fully support making actual phone calls Page 293 ifndef _ CALLUTIL_H__ define _ CALLUTIL_H__ library include files none local include files none constants resolution of sine calculation points per 360 degrees define SINE_RESOLUTION 1024 length of the ring tone in sample rate units 2 seconds define RING_TONE_TIME 2 SAMPLE_RATE length of the ring silent period in sample rate units 4 seconds define RING_SILENT_TIME 4 SAMPLE_RATE Page 294 length of the busy tone period in sample rate units 0 5 seconds define BUSY_TONE_TIME SAMPLE_RATE 2 length of the busy silent time in sample rate units 0 5 seconds define BUSY_SILENT_TIME SAMPLE_RATE 2 structures unions and typedefs none function declarations call status funct
76. E_SVC I_BIT F_BIT MOV sp rO SUB rO rO SVC_STACK_SIZE Page 133 MSR cpsr_c ARM_MODE_USR F_BIT MOV sp rO Future Code for Peripheral Initialization CE EEO EOE OO EC EOE EE ECE EOOE EEE EE EO EE Eventually all the rest of your code will end up here Clock Initialization CE EC EO OOO OEE EC OM OEE OE EEOC ECE EEE A A A A EEE EEE EEEE CEE E EEEE ClockMainInitStart LDR rO MCKSTARTCON LDR r1 PMC_MCKR STR rO r1 first set clock to master clock from slow clock ClockMainInitStab LDR rO PMC_SR LDR r1 r0 LDR r2 LOW_BIT_MASK AND rO r1 r2 determine whether clock has signal has stabilized CMP rO r2 check if stable BNE ClockMainlnitStab if not stable then keep Page 134 looping if low bit is set then clock has stabilized and boot can continue ClockInitStart Set PLLA to be masterclock with frequency 75 MHz Proc_Clock LDR rO PMC_SCER enable processor clock LDR r1 PRCCLKCON STR r1 r0 Main_Osc LDR rO PMC_MOR install the main oscillator LDR r1 MORCON STR r1 r0 LDR r1 WAIT_TIME set wait loop counter WaitLoop1 wait a while to let clock stabilize SUB r1 r1 0x1 subtract 1 from the wait loop counter CMP r1 0x0 once counter is zero code can continue BNE WaitLoop1 if the counter is not zero keep waiting Page 135 PLLAR LDR r0 PMC_PLLAR initialize PLLA LDR r1 PLLARCON STR r1 r0 LDR r1 WAIT_TIME
77. IP stack functions to set the subnet mask to the just entered IP address Then the TCP connection is restarted Arguments cur_status enum status the current system status ignored key_value int value of the key that was input ignored Return Value enum status the new status always STAT_IDLE Input None Output None Error Handling If there is an error getting the named interface given by ETHER_INTF the error handler is called with the error UNKNOWN_ETHER_NAME Algorithms None Data Structures None Page 351 Shared Variables None Author Glen George Last Modified March 10 2011 enum status set_subnet enum status cur_status int key_value variables ifndef NO_LWIP empty function if there is no LWIP code struct netif net_intf network interface to access struct ip_addr mask the new subnet mask create the subnet mask in network order mask addr htonl get_calling_IP now get the network interface for our device net_intf netif_find ETHER_INTF check if got an interface Page 352 if net_intf NULL got the interface set the subnet mask netif_set_netmask net_intf amp mask else no interface report the error process error UNKNOWN_ETHER_NAME endif need to restart the connection tcp_connection_restart done so return with idle as the status return STAT_IDLE
78. IPDigit enum status cur_status int key_value variables unsigned long int current_byte current byte of the IP address Page 338 check if there is room for the digit if IP_digit_cnt lt NUM_IP_DIGITS have room for the digit add it in to the current byte get the current byte s value so far current_byte IP_address amp OxFFOOOOOOL gt gt 8 IP_digit_cnt 3 shift it down to an 8 bit value current_byte gt gt 8 3 IP_digit_cnt 3 add in the new digit if possible if 10 current_byte key_value lt 256 it fits add it in current_byte 10 current_byte key_value compute the new IP address value mask off old bits for the current byte IP_address amp OxFFOOOOOOL gt gt 8 IP_digit_cnt 3 bring in the new value for the byte IP_address current_byte lt lt 8 3 IP_digit_cnt 3 Page 339 update the digit count IP_digit_cnt else doesn t fit call the error handler process_error IP_ADDRESS_ OVERFLOW else too many digits in the IP address call the error handler process_error IP_ADDRESS_OVERFLOW update the calling IP address set_calling_ IP IP_address display the new IP address display_IP IP_address all done adding the digit return the passed status Page 340 return cur_status
79. If no buffer is filled the function returns NULL Operation ether_receive operates by first checking if any buffers are filled if not the function returns NULL The function then calls pbuf_alloc to obtain a pbuf structure which can be filled The fucntion then iterates through the pbuf until all the data in the receive buffer has been transferred the function then returns the pointer to the now filled pbuf structure Arguments None Return Values rO pointer to filled pbuf or NULL Local Variables rO general storage r1 general storage Page 180 r2 counter 1 r3 counter 2 r4 counter 3 r5 pbuf start address amp r6 value storage r7 values loaded from variables Shared Variables RBQP filled_buffer_num Global Variables None Input EMAC Output None Error Handling None Registers Changed rO Stack Depth 8 Algorithms None Data Structures RBQP Known Bugs None Limitations None Revision Hisotry 3 3 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments Updated Page 181 global ether_receive ether_receive PUSH r1 r2 r3 r4 r5 r6 r7 LR BL ether_rx_available determine if there is a filled pbuf address of filled buffer now in r3 CMP rO TRUE if not indicate theres none BNE ether_receive_no_data if there is a filled payload extr
80. June 7 2006 enum status save_mem enum status cur_status int key_value variables none is the memory location number valid if memloc gt 0 amp amp memloc lt MEMORY_SIZE valid memory location number save the IP address saved_ IPs memloc get_calling_IP and restore the system status cur_status old_status restore the old IP address too display_IP get_calling_IP Page 405 else bad memory location number call the error handler process error BAD_MEMORY_ADDRESS all done saving an address return the possibly new status return cur_status recall_ mem Description This function handles the lt Send Enter gt key when a memory location is being recalled If the memory location number is valid it sets the current IP address to the address saved at that memory location If the memory location number is out of range 0 or greater than Page 406 MEMORY_SIZE the error handler is called The function returns with the STAT_RECALLED state if there was no no error and it wasn t in the off hook state before It returns with the passed state if there was an error and with the off hook state if that s the state it was in before Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status Input Non
81. LEECECECEEEO PCO COCO ECEC CECE OC LOLOL OEE ECE ECE LLEEECEEEEEEEEEECE Page 165 include at91rm9200 inc include armvoip inc include ether inc text arm align 2 ether_init Description ether_init initializes the shared variables needed by other ethernet functions initializes buffers used for DMA transfers sets up DMA interrupt handlers initializes the ethernet protocol and creates the receive buffer status register RBQP Note that RBQP contains the receive buffers Operation Moves many control words into appropriate registers and creates the RBQP buffer by iterating through its chunks and storing the address of where in RBQP_BUFF data should be stored incrementing by a word then storing the maximum O O O Q size of data that can be stored in that buffer When the last Page 166 chunk is reached the wrap bit is set Arguments None Return Values rO TRUE if intialized with no errors FALSE otherwise Local Variables rO contains addresses and control words r1 contains addresses and control words r2 counter needed for buffer set up Shared Variables RBQP RBQP_BUFF Global Variables None Input None Output None Error Handling Checks for ethernet errors and returns FALSE if one occurs Registers Changed rO Stack Depth 2 Algorithms None Data Structures RBQP RBQP_BUFF
82. LR restore used registers and return BX LR after initialization jump to main loop display_IP Description This function takes a 32 bit input in rO and displays the equivalent IP address on the VOIP systesms display The format of the output display is 4 sets of three digit values seperated by ellipses as in a standard IP address Operation The function contains a loop that shifts the input value so that the byte currently being output to display is the lowest byte in the register being operated on Then all other bits in the register are masked Next the function divides the register by the highest possible value of 10 1000 initially The remainder of this division is converted to ASCII and output to the display Then the register containing the power of 10 is divided by 10 and the division repeats itself until the last digit is output Once this is done a count decrements to cause the shift to move a different byte to the low byte of the operation register The procedure A AQA then loops and should repeat itself exactly 4 times After Page 147 each byte an ellipse is output to the display Arguments rO Value to output as an IP address to the display Return Values None Local Variables rO division remainder r1 division quotient r2 shift counter r3 IP address initial value r4 Power of 10 A r5 individual character byte value Shared Vari
83. OLOL EEE EEE EE OLLELEECECEEEO CO OCECO CEC CECEC OL OLL OEE ECE EEL LEE EEE EEEELEEECOE timers s Initialization event handling and basic functions of VOIP timers Table of Contents 1 TimerOlnit Initializes TCO and causes it to trigger interrupts every millisecond 2 TimerOHandler Increments the counter used by elapsed_time to determine how many milliseconds have passed Also reads from 1 4th of the columns inthe system s DRAM to refresh them 3 elapsed_time Returns the number of milliseconds since elapsed_time was last called Revision History 2012 3 6 Josh Fromm Initial Revision 2012 3 29 Josh Fromm Comments Updated PCO OCOOC CO CEEOL OLO OEE EC ECECECOLLEOL EEE CEE EE LOLEEECECEEEO CO COCO CEC OCECEC OL OLOL EEE ECE EEL LEE ECEEEEEEOEEECE include at91rm9200 inc include armvoip inc Page 226 include timers inc text arm align 2 TimerOlInit Description This function sets up timer 0 of the system to cause an interrupt every millisecond The function also installs the timer 0 event handler that is called when a timer O interrupt is detected Shared variables used by timer functions are also set up Operation TimerOlnit sets up timer and AIC registers with the needed control words Arguments None Return Values None Local Variables rO addresses r1 control
84. PU SRAM ROM Clock Logic and Main Buffers This subsection will cover the schematics and specific signals of the CPU SRAM ROM Clock Logic and buffers used in the VOIP system The clock logic of the system which can be seen on page 1 of the included schematics allows a PLL frequency of 150 megahertz to be established This frequency is set as the processor clock speed and the master clock speed seen in timing diagrams as MCK is set to be 75 megahertz Page 1 of the included schematics titled ARM Schematic V1 shows the schematic of the CPU SRAM ROM clock logic and buffers SRAM The SRAM used by the system is an IDT71V016SA 64K x 16 bit CMOS Static RAM chip The interaction between the CPU and SRAM will be focused on first The SRAM serves as the main memory of the system and stores code variables and many buffers Thus the CPU must be able to both read and write from the SRAM Following is a diagram of the signals required for the CPU to perform an SRAM read and an explanation of the timings involved It should be noted that the CPU is set to perform half word 16 bit reads with 2 wait states when interacting with the SRAM Page 18 Ops MCK Addresses NRD NUB NLB DataRead 10ns j sMc4 20ns 30ns 40ns 50ns 60ns merilih lirite derti leii naa lead A NCS0 l EF tPHL tPLH BNCSO SMG3 SMC31 SMC37 SRAM read signals and timing where Dat
85. Page 328 The locally global shared variable definitions included are IP_address the current value of the IP address IP_digit_cnt number of decimal digits input to the IP address Revision History 6 3 06 Glen George Initial revision 6 6 06 Glen George Changed start_IPEntry to output the current ethernet address all O s 6 7 06 Glen George Changed clear_IPAddr to handle clearing a recalled address correctly 6 7 06 Glen George Updated del_IPDigit to work better with a recalled address i e don t clear it out 6 8 06 GlenGeorge Added code to actually set the IP address gateway and subnet mask 5 26 08 Glen George Only do actual IP calls if NO_LWIP is not defined 6 13 08 Glen George Fixed a number of compiler errors 3 10 11 Glen George Updated code so any time the ethernet interface is changed changing the gateway for example the connection is restarted Page 329 library include files ifndef NO_LWIP don t include files if not using LWIP include Iwip netif h include lwip ip_addr h endif local include files include interfac h include voipdefs h include keyproc h include error h include callutil h include tcpconn h local function declarations static void clr_IP_address void Page 330 locally global shared variables static unsigned long int IP_address the current IP address static int IP_digit_cnt the number of IP addres
86. R r1 r0 LDR rO DRAM_count get current refresh number LDR r1 r0 LDR rO DRAM_CHUNK MUL r1 r1 rO multiply number of reads per iteration by the refresh number of this cycle to get start address to read from ADD r1 r1 DRAM_START LDR r2 0x0 set counter to zero DRAMRefresh set up a DRAM read of 1 4th of the columns in DRAM LDR rO DRAM_CHUNK CMP r2 rO check if 1 4th of DRAM has been read from yet BEQ DRAMCountUpdate if so we re done refreshing the DRAM LDRB rO r1 otherwise read a byte from the current column ADD r1 r1 0x1 increment column address by 1 for next read ADD r2 r2 0x1 increment counter to keep track of reads B DRAMRefresh continue refreshing DRAM Page 221 DRAMCountUpdate if all columns have been refreshed restart refresh cycle LDR r0 DRAM_count check if the value in DRAM_count is at its maximum value LDR r1 r0 CMP r1 DRAM_REFRESH_RATE BNE DRAMCountInc increment DRAM if cycle shouldnt be reset LDR r1 0x0 if DRAM_count is maximum value set it back to 0 STR r1 r0 B TimerOHandlerDone DRAMCountlnc increment DRAM_count by 1 LDR r0 DRAM_count load value in DRAM_count LDR r1 r0 ADD r1 r1 0x1 add1 STR r1 r0 store new value BTimerOHandlerDone function can finish TimerOHandlerDone LDR rO TCO_SR read timer O status register to reset interrupt status LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt LDR r1
87. STR r1 r0 Page 200 LDR rO keypressed at first there are no available keys to handle so the variable indicating available keys is false LDR r1 FALSE STR r1 r0 LDR rO shiftkey keypad should be unshifted at first LDR r1 FALSE STR r1 r0 LDR rO PIOC_ISR read the value of the interrupt status register to allow future interrupts LDR r1 r0 LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt to refresh any standing interrupt LDR r1 TRUE STR r1 r0 POP r0 r1 restore used registers BX LR after initialization jump to main loop Page 201 KeypadPressHandler Description KeypadPressHandler is called whenever a change on the RDY A B HB BB HB QB HB QB QB amp Page 202 line is detected when a key is presssed KeypadPressHandler saves the key code of the msot recent key press and indicates that a key is available KeypadPressHandler also checks if the pressed key is the shift key If so it does not save a key code or indicate a key is available Instead it causes all future key presses to yield higher key codes until the shift key is pressed again This allows the keypad to be able to have about twice as many distinct keys as normal Operation KeypadPressHandler reads the value of the keypad data lines and if the read value isn t the shift key stores the value in the shared variable keyvalue KeypadPressHandler then set
88. The ethernet interface is also checked for buffers Arguments None Return Value None Input None Page 272 Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 9 2011 Ph void process _call variables enum tcp_conn_status cur_status get the current connection state cur_status tcp_connection_status Page 273 current connection state if the current connection state has changed need to reset the the receive buffers they may have old tone data in them if cur_status last_status reset_tx_buffer always update the last status last_status cur_status now check the status of the connection switch cur_status case CALL_RINGING connection is ringing on the other end generate a buffer of ringing tone if there is room for it if rcv_available have a buffer get and fill it ring_fill get_rcv_buffer AUDIO_BUFLEN if there is a buffer to transmit need todiscard it if xmit_available Page 274 have a buffer dump it get_xmit_buffer break case CALL_BUSY connection is busy on the other end generate a buffer of busy signal if there is room for it if rcv_available have a buffer get and fill it busy_fill get_rcv_buffer
89. This includes constant and structure definitions along with the function declarations for the assembly language functions Revision History 6 3 06 Glen George Initial revision 6 5 06 Glen George Removed the far keyword from the pointers in the assembly language function declarations 6 6 06 Glen George Removed buffer structure definition 6 6 06 Glen George Fixed missing declaration of update_tx 6 9 09 Glen George Added declarations for networking functions Page 463 6 12 09 Glen George Fixed minor compiler error 2 28 11 Glen George Updated prototypes for call_ start update_rx and update_tx to match new specification 3 9 11 Glen George Added some networking constants and removed the audio constants they are no longer used ifndef __ VOIPDEFS_H__ define _ VOIPDEFS_H__ library include files ifndef NO_LWIP don t include files if not using LWIP include lwip pbuf h endif local include files include interfac h Page 464 constants general constants define FALSE O define TRUE IFALSE define NULL void O IP parameters define NUM_IP_DIGITS 12 number of decimal digits in an IP address define MAGIC_IP OxOOFF55AA IP address that should not occur define CALL_LISTEN_PORT 0x4747 port to listen for connections miscellaneous constants define MAX_NAME_LEN 40 maximum length of a caller ID name structures unions
90. _ONHOOK KEYCODE_SETIP Off Hook key lt Set IP gt KEYCODE_SETSUBNET lt Set Subnet gt KEYCODE _SET GW lt Set Gateway gt KEYCODE_MEMSAVE lt Memory Save gt KEYCODE_MEMRECALL lt Memory Recall gt 0 Page 372 other keys whether or not numeric keys have priority static const int numeric_priority Current System Status idle off hook ringing connecting connected FALSE TRUE FALSE FALSE FALSE set IP set subnet set gateway mem save mem recall TRUE TRUE TRUE TRUE TRUE recalled FALSE key processing functions one for each system status type and key static enum status const process_key NUM_KEYTYPES NUM_STATUS enum status int Current System Status idle off hook ringing connecting connected key set IP set subnet set gateway mem save mem recall type recalled no_action add_IPDigit no_action no_action no_action Digit i add_IPDigit add_IPDigit add_IPDigit add_memDigit add_memDigit no_action Page 373 no_action clear_IPAddr no_action no_action no_action Escape clear_IPAddr clear_IPAddr clear_IPAddr clear_memLoc clear_memLoc clear_IPAddr no_action del_IPDigit no_action no_action no_action Backspace del_IPDigit del_IPDigit del_IPDigit del_memDigit del_memDigit no_action no_action do_call do_answer end_call
91. _SA1L EMAC_IMR EMAC_FRA EMAC_SA3H EMAC_SA1H EMAC_SCOL EMAC_ALE EMAC_TAR EMAC_SAAL OxFFFBCOA4 OxFFFBCO94 OxFFFBCO5C OxFFFBCO4C OxFFFBCO04 OxFFFBCOA8 OxFFFBCO50 OxFFFBCO60 OxFFFBCO70 OxFFFBCO08 OxFFFBCO18 OxFFFBC064 OxFFFBCO74 OxFFFBCO78 OxFFFBCO2C OxFFFBCO98 OxFFFBCO30 OxFFFBCO40 OxFFFBCOAC OxFFFBCO9C OxFFFBCO44 OxFFFBCO54 OxFFFBCOOC OxFFFBCOBO Specific Address 2 High Last 2 bytes Hash Address Low 31 0 Late Collision Frames Received OK Network Configuration Specific Address 3 Low First 4 bytes Frame Check Sequence Error Excessive Collision Excessive Length Error Network Status Receive Buffer Queue Pointer Carrier Sense Error Receive Jabber Undersize Frame Interrupt Disable Specific Address 1 Low First 4 bytes Interrupt Mask Frames Transmitted OK Specific Address 3 High Last 2 bytes Specific Address 1 High Last 2 bytes Single Collision Frame Alignment Error Transmit Address Specific Address 4 Low First 4 bytes equ equ equ equ equ equ equ equ equ equ EMAC_SA2L OxFFFBCOAO Specific Address 2 Low First 4 bytes EMAC_TUE OxFFFBC068 Transmit Underrun Error EMAC_DTE OxFFFBCO58 Deferred Transmission Frame EMAC_TCR OxFFFBCO10 Transmit Control EMAC_CTL OxFFFBCOOO Network Control EMAC_SA4H OxFFFBCOB4 Specific Address 4 High Last 2 bytes EMAC_C
92. a it is sent to the Codec and is converted to an analog signal which is sent out to the system s speaker jack Data being sent to or received from the codec by the CPU is stored on the DRAM U16 DRAM The systems DRAM U16 is used to store large audio buffers that are input and output by the codec U10 The signals used to control DRAM reads and writes are generated by U12 which monitors NCS3 and NWRO to determine whether a read cycle or write cycle should be performed The DRAM uses 3 8 4 multiplexers U13 U14 and U15 to properly select row and column addresses during a read or write cycle The data from the DRAM then is buffered by U5 and sent to the CPU for a read cycle or sent from the CPU to be buffered by U5 and written to U16 Ethernet The systems Ethernet chip U17 interacts only with the CPU through the CPU s EMAC controller Thus no additional buffers are needed U17 receives divided master clock signals on RX_CLK and TX_CLK as well as its own dedicated 25 megahertz clock signal which go to the X1 and X2 pins When an Ethernet connection is made data is received on the systems Ethernet port handled by U17 and sent to the CPU s EMAC controller Likewise when the CPU is outputting data it is first sent to U17 where it is processed and then output through the Ethernet jack Page 53 Software Manual This details how the software run by the system works The following image is a diagram of how each of the func
93. aRead is valid data Signal Time ns Signal Name Signal Description SMC 4 MCK Falling to Chip Select 6 5 Change SMC 3 MCK Falling to A1 A25 Valid 7 4 SMC 30 MCK Rising to NRD Active 7 0 SMC 2 MCK Falling to NLB AO Valid 7 5 tPHL Propagation time due to 3 3 buffer high to low tPLH Propagation time due to 3 3 buffer low to high tOE Delay between active read 6 and valid data tACS Access delay 12 SMC 40 Data Setup Time before NRD 7 5 Page 19 High tOH Delay from invalid addresses 4 to invalid data SMC 31 MCK Falling to NRD Inactive 6 8 SMC 37 NRD High to A1 A25 Change 3 SMC 35 NRD High to NUB Change 5 SMC 41 Data Hold after NRD High 0 Explanation of SRAM read signals and timings Following is a similar explanation of SRAM write timings 10ns 20ns 30ns 40ns 50ns 60ns 7Ons ritalin beet end a eine a ad MCK SMCs SIMC4 NCS1 tPHL fy PH BNCS1 twe tAS SMC i C4 Addresses TTT m SMC11 SMC13 NWRO SMC16 SMCPY pI NUB NLB tH LU SMC14 i tDW SMC22 tAW sal twp gt tCW al tBYV op tWR b smc20 DataWrite l yaa MO Page 20 SRAM write signals and timings Note that DataWrite is valid data Signal Name Signal Description Signal Time ns SMC 11 MCK Rising to NWR Active 4 8 SMC 14 MCK Rising to DO D15 Out 7 9 Valid tW
94. ables None Global Variables None Input None Output Displays an IP address on the bottom row of the display module Error Handling None Registers Used None Stack Depth 7 words Algorithms Repeatedly divide by powers of 10 to get digits and remainders needed for next division Data Structures Arrays for output string Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision Page 148 2 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global display_IP display_IP display_IP_Init PUSH r0 r1 r2 r3 r4 r5 LR MOV r3 rO save the passed IP address LDR r2 Num_ Shifts load the inital number of shifts needed LDR rO DISP_CS_ first change display address to be bottom row LDR r1 BOTTOM_ROW STRB r1 r0 display_IP_ Shift MOV r5 r3 reset r5 to be the initial IP value LSR r5 r2 shift the IP value by the number of bits remaining in the the shift register AND r5 r5 LOW_BYTE_MASK mask all bits except low byte LDR r4 MAX_10 prepare for display loop by setting power of 10 display_IP_Main MOV ri r4 first set denominator to be the current power of 10 Page 149 MOV r0 r5 set numerator to be binary value of a byte BL Divide divide numerator by denominator MOV r5 r0 store remainder as new byte value BL DispBusyCheck LDR rO DISPLAY_WRITE output quotient of division A
95. act the data from its RBQP chunk LDR r2 r3 PUSH r2 r3 save unaltered first word of RBQP and chunk address for later to allow reset of ownership and size LDR r5 OxFFFFFFFC AND r2 r2 r5 extract address of payload ADD r3 r3 0x4 go to next word to extract size LDR r4 r3 LDR r1 0x7FF AND r4 r4 r1 extract the length of payload MOV r6 r2 save the address of the payload in r6 Page 182 for later to allow reset of ownership and size BEQreceive_get_pbuf otherwise acquire a pbuf receive_get_pbuf LDR r0 PBUF_RAW MOV ri r4 set size to be the value found in ether_rx_available LDR r2 PBUF_POOL BL pbuf_alloc now begin to transfer data to the pbuf at rO current pbuf pointer address stored in rO LDR r2 0x0 initialize counter MOV r1 rO save pointer to beginning of pbuf for return value r1 will be used as a pointer to a variable pbuf instead receive_main LDR r3 r1 set r3 to be the pointer to the next pbuf packet ADD r1 r1 0x4 increment to next word in pbuf structure LDR r5 r1 set r6 to be payload address ADD r1 r1 0x4 LDR r7 r1 set r7 to be size of current payload Page 183 LSR r7 BITSPHW dont care about cumulative size of payloads only interested in size of current payload BL copy ADD r6 r6 r7 increment address of payload so next pbuf will be filled correctly MOV r1 r3 update current pbuf pointer to the next pointer ADD r2 r2
96. all by calling the function connect_incoming and then returns the status STAT_CONNECTED Arguments cur_status enum status the current system status ignored key_value int value of the key that was input ignored Return Value enum status the new status always STAT_CONNECTED Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Page 244 Last Modified June 3 2006 enum status do_answer enum status cur_status int key_value variables none connect to the incoming call connect_incoming and return that we are connected now return STAT_CONNECTED Page 245 do _call Description This function handles the lt Send gt key to start an outgoing call Operation It just starts the call by calling initiate_outgoing and then returns the status STAT_CONNECTING Arguments cur_status enum status the current system status ignored key_value int value of the key that was input ignored Return Value enum status the new status always STAT_CONNECTING Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Page 246 Author Glen George Last Modified June 3 2006 enum status do_call enum status cur_status int key_value variables
97. and control words Shared Variables None Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None Page 107 Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global sscO_init sscO_ init PUSH r0 r1 save used registers LDR r0 PMC_PCER enable sscO clock and piob clock LDR r1 PMC_PCER_AUDIO STR r1 r0 LDR rO PIOB_PDR_ disable the pins needed by SSCO LDR r1 SSCO_PINS STR r1 r0 LDR rO PIOB_ASR shift control of those pins to peripheral A STR r1 r0 LDR r0 SSCO_CMR set up clock mode register LDR r1 SSCO_CMR_VAL STR r1 r0 Page 108 LDR rO SSCO_RCMR set up receive clock mode register LDR r1 SSCO_RCMR_VAL STR r1 r0 LDR rO SSCO_RFMR set up receive frame mode register LDR r1 SSCO_RFMR_VAL STR r1 r0 LDR r0 SSCO_TCMR set up transmit clock mode register LDR r1 SSCO_TCMR_VAL STR r1 r0 LDR rO SSCO_TFMR set up transmit frame mode register LDR r1 SSCO_TFMR_VAL STR r1 r0 LDR rO AIC_SMR14 set priority for sscO interrupts LDR r1 AIC_SMR14_VAL STR r1 r0 LDR rO AIC_SVR14 cause sscO interrupts to jump to CodecHandler LDR r1 CodecHandler STR r1 r0 Pa
98. anged updated on each call Author Glen George Last Modified March 16 2011 static void ring_fill short int p int size variables Page 281 long int sig 500 value of the 420 Hz tone signal long int sig 20 value of the 40 Hz modulating signal long int angle angle to find the sine for int i general loop index fillthe buffer with data for i 0 i lt size i check if past the end of the tone silent portion if ring_busy_timer gt RING_TONE_TIME RING_SILENT_TIME timer has wrapped reset it ring _busy_timer 0 get the angle for both waveforms with a factor of 25 calculation is complicated to keep it from overflowing angle 500 ring_busy_timer SAMPLE_RATE SINE_RESOLUTION 500 ring_busy_timer SAMPLE_RATE SINE_RESOLUTION SAMPLE_RATE get the 500 Hz sine wave Page 282 sig 500 sine_wave angle now get the 20 Hz modulation wave 25 500 Hz 20 Hz sig_20 sine_wave angle 25 the modulation signal should always be positive if sig_20 lt 0 sig 20 sig 20 should the tone be output or should it be silent if ring _busy_timer lt RING_TONE_TIME outputting the tone make it 13 dBm pli sig_500 sig 20 4096 4 else output no tone store a 0 p i 0 all done filling the buffer return return Page 28
99. ating it short int get_rcv_buffer void get a buffer to fill with ethernet data short int get_rcv_next_ptr void get the buffer to fill with ethernet w o allocating it endif Page 241 OEEREELERA EREEREER EE CE RELERE ALATEST ERS CERES TERRE LSC Re ee Le Tene he CALLPROC Call Processing Functions 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE KEE KE EE K E E E AE E E EE E E E E ROEE EE EEEE EE E EER EEE KEE EKE EEE EEEE E EEK E This file contains the key processing functions for initiating and ending calls for the VoIP Telephone Project These functions are called by the main loop of the system The functions included are do_answer handle picking up an incoming call do_call initiate an outgoing call end_call end a call The local functions included are none The global variable definitions included are none Page 242 Revision History 6 3 06 Glen George Initial revision 3 8 11 Glen George Updated comments library include files none local include files include interfac h include voipdefs h include keyproc h include error h include callutil h do_answer Description This function handles answering a phone call It is Page 243 assumed that there is an incoming call and this function is called when the phone goes off hook Operation The function initiates the c
100. bytes indicated in size from the transfer buffer into the receive buffer Arguments r5 Address of receive buffer r6 Address of transfer buffer r7 number of bytes to be copied Return Values None Local Variables rO counter r1 value at current transfer address r5 address of current receive byte r6 address of current transfer byte Shared Variables None Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 5 Page 191 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 3 3 2012 Josh Fromm Outline Created copy PUSH r0 r1 r5 r6 r7 save used registers LDR r Ox0 copy_loop LDRB r1 r6 STRB r1 r5 ADD r5 r5 0x1 ADD r6 r6 0x1 ADD rO rO 0x1 CMP rO r7 loop through each byte and move it move a byte to receive buffer increment byte position in the buffers keep track of how many moves have been done if we ve moved the expected number of bytes function is done BNE copy_loop BEQcopy_done Page 192 otherwise keep moving bytes copy_done POP r0 r1 r5 r6 r7 restore used registers and return BX LR end Page 193 keypad inc This file contains the constants used by the functions that run the VOIP system s keypad input Revisio
101. ccurred since the last call to the elapsed_time function and also refreshes the DRAM through reads to all column addresses e Audio s Audio s contains the functions needed to set up SSCO interrupts an event handler for those interrupts and functions used by the main loop to update the buffers containing data that is input and output from the codec Audio s interacts directly with the codec which then interacts with the system s speaker and microphone jacks e Ether s e IwiP Page 57 Ether s contains functions used to convert between the PBUF data buffers used by the IwIP code and standard buffers Ether s interacts with the main loop to receive buffers which are converted to PBUFs and sent out over Ethernet as well as to provide buffers that have been converted from PBUFs Ether s also interacts with IwIP to allocate the PBUFs needed when preparing to transmit a buffer IwiP is the code that runs the majority of the system s Ethernet It interacts with the main loop as well as ether s IwIP handles all the abstraction layers of Ethernet except the application layer handled by main loop and the lowest layer handled by ether s Initialization done Interaction of Software Functions Page 58 Ethernet Functions Audio Functions ARM VOIP VARIABLE SHARING Display Functions Keypad Functions Timer Functions el Page 59 Explanation of Function Diagrams The system is initialize
102. code of most recently pressed key Local Variables rO register addresses and loaded values key code r1 register addreses and values Shared Variables keyvalue shiftkey Global Variables None Input None Output None Error Handling None Registers Changed r0 Stack Depth 1 Algorithms None Data Structures None Page 209 Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments updated global getkey getkey PUSH r1 save register LDR rO keypressed first indicate key press is being processed LDR r1 FALSE STR r1 r0 invalidkeyloop determine if shift key is pressed and handle accordingly LDR ri shiftkey load value of shiftkey variable LDR rO r1 CMP rO TRUE if value is true keycode must be shifted BEQ getkey_shifted if true must add on shift value BNE getkey_unshifted otherwise handle normally Page 210 getkey_unshifted keycode does not need to be shifted LDR ri keyvalue load value of key code into return register LDR rO r1 B getkeyend function is done getkey_shifted keycode must be shifted LDR r1 keyvalue load value of of key code into return register LDR rO r1 ADD rO rO SHIFT_VALUE add shift value to keycode variable B getkeyend getkeyend if key code is valid then we can return CMP rO Inva
103. ction status connected have_rx_data changed set to FALSE Author Glen George Last Modified March 10 2011 void tcp_connection_answer void variables none setup the function to receive any data for the call tcp_recv call_pcb receive_data no data yet have_rx_data FALSE send an answer packet Page 429 if tcp_write call_pcb A 1 1 ERR_OK error sending the packet report it process_error NETERR_SEND and the connection is now established cur_status CALL_CONNECTED done answering the call return return tcp_connection_close Description This function closes the current connection Operation If there is a connection it is closed and the shared variable call_pcb is set to NULL and the connection status is set to no connection Page 430 Arguments None Return Value None Input None Output None Error Handling If there is an error closing the connection the process error function is called with the error NETERR_CLOSE Algorithms None Data Structures None Shared Variables call_pcb changed set to NULL cur_status changed set to CALL_NO_CONNECTION have_rx_data changed set to FALSE Author Glen George Last Modified March 10 2011 void tcp_connection_close Page 431 variables none if there is a connection close it watc
104. d by the file crtO s In crtO s chip selects are set up the master clock is established and the initialization functions of the peripherals are called Finally crtO s branches to the main loop located in mainloop c Mainloop c then proceeds to run the rest of the system The main loop constantly checks whether a key press is available by calling key_available If key_available indicates there is a key press the main loop acquires the key code through getkey The main loop then handles the key code and outputs the status of the system to the display through calls to display_status display_memory_addr and display_IP The main loop also initializes the systems Ethernet through a call to ether_init Once Ethernet is initialized the main loop sends out an ARP packet over internet through calls to IwIP and ether_transmit The main loop also constantly scans to determine whether Ethernet data has been received by calling ether_rx_available If a buffer has been received the main loop calls ether_receive to package that data in a more suitable format Finally the mian loop initializes SSCO interrupts when it enters a calling state through a call to call_start Once interrupts are initialized codec_handler will be called during every frame sync interrupt and output and input one half word 16 bits to from the codec During this time the main loop frequently calls update_tx and update_rx to determine if new audio buffers are needed by the code in audio s Th
105. d state of both cycles third state of write cycle fourth state of write cycle fifth state of write cycle sixth state of write cycle seventh state of write cycle eighth state of write cycle third state of read cycle fourth state of read cycle fifth state of read cycle sixth state of read cycle Read7 0 O 0 1 0 1 1 seventh state of read cycle Read8 1 1 0 1 O 0 OJ ninth state of read cycle EQUATIONS output enables SBITS OE 1 clocks SBITS CLK Clock STATE_DIAGRAM SBITS STATE Start GOTO Idle STATE Idle IF NCS3 THEN State1 if cpu accessing dram go to state 1 ELSE Idle all other states progress without condition Page 36 STATE State1 GOTO State2 STATE ELSE STATE STATE STATE STATE STATE State2 IF INWRO THEN Write3 Read3 Write3 GOTO Write4 Write4 GOTO Write5 Write5 GOTO Write6 Write6 GOTO Write7 Write7 GOTO Write8 STATE Writes GOTO Idle Page 37 STATE Read3 GOTO Read4 STATE Read4 GOTO Read5 STATE Read5 GOTO Read6 STATE Read6 GOTO Read7 STATE Read7 GOTO Read8 STATE Reads GOTO Idle TEST_VECTORS test dram controller state machine Clock NCS3 NWRO gt RAS CAS SEL WE StBitO StBit1 StBit2 Page 38 first clear out PLD and make sure state is Idle by allowing 30 clock cycles to pass repeat 30 c 1 1 gt X
106. d_time_count Page 231 Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Words Algorithms None Data Structures None Known Bugs None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision TimerOHandler SUB LR LR 4 first correct systems pipeline STMFD SP LR save link register and other used registers PUSH r0 r1 r2 LDR rO elapsed_time_count increment the count of elapsed milliseconds since last elapsed_time function call LDR r1 r0 ADD r1 r1 0x1 Page 232 STR r1 r0 LDR rO DRAM_count get current refresh number LDR r1 r0 LDR rO DRAM_CHUNK MUL r1 r1 rO multiply number of reads per iteration by the refresh number of this cycle to get start address to read from ADD r1 r1 DRAM_START LDR r2 0x0 set counter to zero DRAMRefresh set up a DRAM read of 1 4th of the columns in DRAM LDR rO DRAM_CHUNK CMP r2 rO check if 1 4th of DRAM has been read from yet BEQ DRAMCountUpdate if so we re done refreshing the DRAM LDRB rO r1 otherwise read a byte from the current column ADD r1 r1 0x1 increment column address by 1 for next read ADD r2 r2 0x1 increment counter to keep track of reads B DRAMRefresh continue refreshing DRAM Page 233 DRAMCountUpdate if all columns have been refreshed restart refresh cycle LDR r0 DRAM_cou
107. ddress IP4_ADDR amp gateway 192 168 1 1 IP4_ADDR amp netmask 255 255 255 0 IP4_ADDR amp default_addr 192 168 1 21 tell lwIP about the network interface netif_add amp etO amp default_addr amp netmask amp gateway NULL ethernetif_init ip_input set etO as the default interface and set up the interface netif_set_default amp et0 netif_set_up amp et0 done initializing the ethernet interface return return Page 310 ethernetif_init Description This function handles initialization of the ethernet interface itself It is meant to be passed as a parameter to netif_add Operation The passed network interface is initialized and then the hardware is initialized Arguments etx struct netif pointer to the network interface whose hardware is to be initialized Return Value err_t ERR_OK if the interface is initialized or ERR_IF if there is an error initializing the hardware Input None Output None Error Handling If there is an error initializing the hardware ERR_IF is returned Algorithms None Data Structures None Page 311 Shared Variables None Author Glen George Last Modified March 8 2011 Df err_t ethernetif_init struct netif etx variables char err whether or not there is an error make sure the argument is reasonable LWIP_ASSERT etx NULL etx NULL set
108. del_ PDigit Description This function handles a backspace key when an IP address is being input It removes the last input decimal digit from the current value of the IP address If there are no digits in the IP address the error handler is called and the key is ignored The function returns with the system status it was passed Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status same as current status Input None Output None Page 341 Error Handling If there are no digits in the IP address to delete the key is ignored and the error handler is called with the error IP_ADDRESS_UNDERFLOW Algorithms None Data Structures None Shared Variables IP_address changed updated to new address by deleting the lowest decimal digit IP_digit_cnt changed updated to reflect which decimal digit of the IP address will be input next Author Glen George Last Modified June 7 2006 enum status del_IPDigit enum status cur_status int key_value variables unsigned long int current_byte last input byte of the IP address Page 342 are there any digits to delete if IP_digit_cnt gt 0 looks like there should be a digit to delete get the value of the last input byte current_byte IP_address amp OxFFOOOOOOL gt gt 8 IP_digit_cn
109. dicate a new buffer has been accepted or does nothing to indicate no new buffer has been accepted A QB AQ Arguments rO address of available transmit buffer Return Values rO TRUE if passed buffer was accepted FALSE if not Page 124 Local Variables rO contains addresses and variable values r1 contains addresses and variable values r2 contains addresses and variable values Shared Variables txneedbuf txbuff2 Global Variables None Input None Output None Error Handling None Registers Changed rO Stack Depth 2 Algorithms None Data Structures buffer stored at address in txbuff2 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated Page 125 global update_tx update_tx PUSH r1 r2 save used registers LDR r1 txneedbuf determine if a new buffer is needed LDR r2 r1 CMP r2 TRUE BNE update_tx_nobuf if no buffer is needed return false BEQ new_tx_buff ifa buffer is needed move to buffer handling process new_tx_buff accept the new buffer LDR r1 txbuff2 handle by adding passed buffer to buffer two spot STR rO r1 LDR r1 txneedbuf indicate a buffer is no longer needed LDR r2 FALSE STR r2 r1 LDR rO TRUE indicate update was
110. e Output None Error Handling If the current location number is zero or greater than MEMORY_SIZE the key is ignored and the error handler is called with the error BAD_ MEMORY_ADDRESS Algorithms None Data Structures None Shared Variables memloc accessed used to index the saved_IPs array saved_IPs accessed recalled IP address is read from Page 407 this array Author Glen George Last Modified June 7 2006 enum status recall_mem enum status cur_status int key_value variables none is the memory location number valid if memloc gt 0 amp amp memloc lt MEMORY _SIZE valid memory location number get the saved IP address set_calling_IP saved_ IPs memloc display the recalled IP address display_IP saved_IPs memloc and change to the recalled memory state if we weren t off hook Page 408 if old_status STAT_OFFHOOK cur_status STAT_RECALLED else were off hook so go back to that state cur_status STAT_OFFHOOK else bad memory location number call the error handler process_error BAD_MEMORY_ADDRESS all done recalling memory return the possibly new status return cur_status Page 409 JEENE KEEA EREEREER RE REL ERA ALE TES EEE CEL eC Te ROL CT eae eT eee Ree KERERE TCPCONN hi TCP Interface Functions 7 VolP Telephone Project EE CS 52
111. e address offset by number of bytes already stored LDR r1 r0 ADD r2 r2 r1 once base and offset are added r2 contains where to store next read byte LDR rO SSCO_RHR now read next receive half word LDRH r1 r0 STRH r1 r2 and store that value in the buffer LDR rO rxaudiocount update count of bytes written to buffer LDR r1 r0 ADD r1 r1 0x2 STR r1 r0 Page 120 then continue to handle the transmit TxFullCheck first determine if current transmit buffer has been completely transmitted LDR rO txaudiocount LDR r1 r0 CMP r1 AUDIO_BUFLEN compare with total size of audio buffer BNE Handle_Tx if buffer isnt full input normally BEQ TxBuff_Swap if it is full swap to backup buffer TxBuff_Swap switch from buffer 1 to buffer 2 LDR rO txneedbuf LDR r1 r0 CMP r1 TRUE BEQ TxDrop if already in buffer 2 drop data otherwise swap buffers normally LDR rO txaudiocount first reset number of bytes stored in buffer LDR r1 0x0 STR r1 r0 LDR rO txbuff1 set txbuff1 to contain the address of the next buffer Page 121 LDR r1 txbuff2 LDR r2 r1 STR r2 r0 LDR rO txneedbuf indicate that tx needs a new buffer LDR r1 TRUE STR r1 r0 B Handle_Tx then proceed to read and output data TxDrop out of data to transmit must send a blank LDR rO SSCO_THR LDR r1 0x0 STRH r1 r0 output a blank half word B CodecHandlerDone once sent func
112. e calling IP address set_calling IP OL Page 360 now return with the idle state return STAT_IDLE Page 361 REE EEF ERLE EEL LEPA EREE EREEREER EE KE EEEE EEE Le Ce EEKE EE EEE EEE EE EEEE EREE KE EREE KEYPROC H i Key Processing Functions Include File ia VoIP Telphone Project hi EE CS 52 a EERE ELEEEEE EA LERE ELE RARER ELEALAL EEEE ERRER EERRE REE EE ERLE ERLE ERE RE EEE EE A This file contains the constants and function prototypes for the key processing functions defined in ipproc c callproc c memproc c and keyproc c Revision History 6 3 06 Glen George Initial revision ifndef __KEYPROC_H__ define I__KEYPROC_H_ Page 362 library include files none local include files include voipdefs h constants none structures unions and typedefs none function declarations Page 363 enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status enum status Page 364 no_action enum status int nothing to do reset_input enum status int reset input state start_IPEntry enum status int start entering IP address clear_IPAddr enum status int clear the IP address add_IP
113. e main loop also calls elapsed_time to determine when to send out Ethernet acknowledges TimerOHandler uses the systems timer to be called every millisecond via interrupt When called TimerOHandler increments the value returned by elapsed_time by one and refreshes a portion of the systems DRAM by performing reads on a chunk of column addresses Each call to TimerOHandler results in a change in which chunk of DRAM is refreshed so that every 4 milliseconds the entire DRAM is refreshed Page 60 System Code Note that code is written in assembly language c language or make language Assembly files are of type s c files are of type c and MakeFile is the only file written in make Include files in assembly are of file type inc and include files for c or of file type h Also note that the copying of files from notepad to Microsoft Word causes some distortion of comments it is almost certainly easier to view software files directly from the included zip containing all system code Table of Contents LOr 00 SO Ot Ne PPP PrP PB nm BP UNEO MakeFile armvoip inc at91rm9200 inc audio inc audio s boot s crt0 s display inc display s ether inc ether s Genfuncs s keypad inc Keypad s timers inc timers s GLEN GEORGE CODE 17 18 19 20 21 22 23 24 buffers c buffers h callproc c callutil c callutil h error c error h ethernet c Page 61 25 ethernet h 26 interface h
114. e to divide by quotient r2 counter Shared Variables None Global Variables None Input None Page 188 Output None Error Handling None Registers Changed r1 r2 Stack Depth 1 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision 2 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global Divide Divide DivInit PUSH r2 Save used registers LDR r2 0x0 set initial counter value to zero Page 189 DivMain loop used to calculate quotient and remainder CMP r0 r1 determine if subtracting another divisor would cause numerator to become negative BLT DivDone if so value in rO is the remainder of the division SUB rO rO r1 otherwise subtract the divisor from remaining value ADD r2 r2 0x1 and increase counter to indicate another division B DivMain loop back to divide step to repeat DivDone division is finsihed MOV r1 r2 move number of times division occurred into output POP r2 restore used registers BX LR return copy Description Copy moves all the elements of one buffer to another buffer of equal or greater length Page 190 Operation Copy is passed a size in bytes a pointer to a receive buffer and a pointer to a transmit buffer Copy uses a counter to move the number of
115. ed by other peripherals PERPHA_PINS OxO001FF80 Ethernet pins in PIOA PERPHB_PINS OxO80FFOOO E Ethernet pins in PIOB EMAC_CTL_VAL OxC enable transmitting and receiving over ethernet Page 163 equ EMAC_CFG_VAL 0x810 set speed to 10BASET half duplex equ IDLE BIT 0x8 bit corresponding to transmit idle status equ OWNERSHIP_MASK OxFFFFFFFE all bits but the ownership bit Page 164 PCO OCOEOC ECO CEOECOLOL OEE ECECEE OL OLOL EEE ECEEE ELLE EECECEEEO CO OCECO ECE OCEEC ECOL OLOL OEE ECE ECE LLOEELECEEEEEECLEEECOE ether s File Description Initialization event handling and basic functions of VOIP emac interface Table of Contents 1 ether_init initializes buffers shared variables registers and interrupt handlers needed for interacting with EMAC 2 etherDMA_handler Sets needed shared variables to indicate a finished receive or transfer 3 ether_transmit transmits a pbuf chain over ethernet 4 ether_rx_available indicates whether received ethernet data is available 5 ether_ISR determines which receive buffer should be serviced next 6 ether_receive indicates start address of a received data packet Revision History 2012 3 3 Josh Fromm Initial Revision 2012 3 7 Josh Fromm Code updated so that functions work 2012 3 29 Josh Fromm Commenting updated CO COCO ECO CECE LOLOL OECOECECECEC OLE L EEE CEE EE L
116. ed in this file locally The functions included are call_ connected has the other end connected with us connect_incoming connect to an incoming call disconnect_call end a call get_calling IP get the calling IP address accessor get_calling_ name get the calling name accessor incoming call is there an incoming call initiate_outgoing initiate an outgoing call process call process a continuing call set_calling IP set the calling IP address mutator set_calling_name set the calling name mutator start_call start an outgoing call Page 250 The local functions included are ring fill fill buffer with a ring tone busy_fill fill buffer with a busy tone sine_wave get the value of the sine function The locally global variable definitions included are calling IP the IP number of the other party calling name the name of the other party last_status the lassed status of call to find changes in status ring _busy_timer timer for timing ring and busy tones Revision History 6 3 06 Glen George Initial revision only dummy versions of the functions 6 6 06 Glen George Started filling in real functions 6 8 06 Glen George Continued filling in real functions 2 28 11 Glen George Added call to call_halt in disconnect_call 3 10 11 Glen George Updated code to use TCP functions to implement actual calling major changes 3 16 11 Glen George Fixed some bugs in the ring and busy tone generation and changed
117. en George Last Modified March 16 2011 ny Page 288 static int sine_wave long int angle variables samples of one fourth of a cycle of a sine wave static const short int sin wave SINE_RESOLUTION 4 0 25 201 226 401 426 601 626 799 824 995 1189 1380 1567 1751 1930 2105 2275 2439 2598 2750 2896 Page 289 50 1213 1403 1590 1773 1952 2127 2296 2459 2617 2769 2913 75 100 251 276 301 451 476 501 651 675 700 848 873 897 1019 1044 1068 1092 1237 1261 1427 1450 1613 1636 1796 1819 1975 1996 2148 2170 2317 2337 2480 2499 2636 2656 2787 2805 2931 2948 126 326 526 725 922 1285 1474 1659 1841 2018 2191 2358 2519 2675 2824 2966 151 351 551 750 946 1116 1308 1497 1682 1864 2040 2212 2378 2539 2694 2842 2983 176 376 576 774 971 1141 1332 1521 1705 1886 2062 2233 2399 2559 2713 2860 3000 1165 1356 1544 1728 1908 2084 2254 2419 2578 2731 2878 3017 3034 3051 3068 3084 3101 3117 3133 3149 3165 3181 3197 3213 3228 3244 3259 3274 3289 3304 3319 3333 3348 3362 3377 3391 3405 3419 3433 3446 3460 3473 3486 3499 3512 3525 3538 3551 3563 3575 3587 3600 3611 3623 3635 3646 3658 3669 3680 3691 3702 3712 3723
118. ener new_listener setup the callback function for accepting connections tcp_accept listener accept_connection no argument in callbacks tcp_arg listener NULL need a callback for the error handler tcp_err listener error_handler Page 423 else error getting a listener report it process error NETERR_NOLISTEN else error binding to the port report it process_error NETERR_NOBIND done restarting the interface return return tcp_connection_connect Page 424 Description This function tries to connect to a remote device whose IP address is passed Operation If there is currently no connection a connection is started Arguments ip unsigned long int the IP address to connect to Return Value None Input None Output None Error Handling If there is already a connection the process error function is called with the error MULTIPLE_CONNECTIONS If there is an error setting up the connection the process error function is called with the error NETERR_NOCONNECT Algorithms None Data Structures None Shared Variables call_pcb accessed checked to see if there is already a connection Page 425 Author Glen George Last Modified March 10 2011 void tcp_connection_connect unsigned long int ip variables struct tcp_pcb outgoing outgoing TCP connection struct ip_addr_ ipaddr IP addres
119. ents 1 Divide Divides one argument by the other and returns a quotient value anda remainder 2 Copy copies a specified amount of memory from one passed memory address to another passed memory address Revision History 2012 2 24 Josh Fromm Initial Revision 2012 3 4 Josh Fromm Code updated to actually work 2012 3 3 Josh Fromm Copy function added 2012 3 29 Josh Fromm Comments updated COCOCATAOATAOCOCOCOCOCAAOMOCTOCACOMOCAOOCOCOCOCACOTMATMT OT LOLEEEECEEEO CO OCECOC CEC OCECEC OL OLOL OEE ECE EEL LEE EEE EEEEEEEECE Divide numerator denominator Page 187 Description Divide takes a value to be divided and a value to divide by as input and returns a remainder of the division and the number of times the denominator goes into the numerator Operation Divide repeatedly subtracts the denominator from the numerator checking each iteration to see if the the denominator exceeds the numerator The number of subtractions that take place are stored in r2 Once the denominator exceeds the numerator the function returns the remaining numerator as the divisions remainder and the count of how many subtractions took place as the quotient value Arguments rO value to be divided r1 value to divide by Return Values rO remainder r1 quotient value Local Variables rO remainder of each subtraction step r1 valu
120. epts the passed buffer address and returns true If no buffer is needed the function returns false Operation lupdate_tx checks the statuses of shared variables to determine whether a new buffer is needed then updates Page 100 shared variables to indicate a new buffer has been accepted or does nothing to indicate no new buffer has been accepted Arguments rO address of available receive buffer Return Values rO TRUE if passed buffer was accepted FALSE if not Local Variables rO contains addresses and variable values r1 contains addresses and variable values r2 contains addresses and variable values Shared Variables rxneedbuf rxbuff2 Global Variables None Input None Output None Error Handling None Registers Changed r0 Stack Depth 2 Algorithms None Data Structures buffer stored at address in rxbuff2 Known Bugs None Page 101 Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global update_rx update_rx PUSH r1 r2 save used registers LDR r1 rxneedbuf check if a new buffer is needed LDR r2 r1 CMP r2 TRUE BNE update_rx_nobuf if not end function BEQ new_rx_buff otherwise get the new buffer new_rx_buff LDR r1 rxbuff2 store passed pointer in spot allocated to
121. eripheral PID pins LDR rO PMC_PCER Supply clocks to needed peripherals LDR r1 PMC_PCER_ETHER STR r1 r0 LDR rO PIOA_PDR_ disable most PIOA pins LDR r1 ETHER_PINS Page 169 STR r1 r0 LDR rO PIOB_PDR_ disable most PIOB pins STR r1 r0 LDR rO PIOA_ASR convert needed PIOA pins to peripheral A LDR r1 PERPHA_PINS STR r1 r0 LDR rO PIOB_BSR convert needed PIOB pins to peripheral B LDR r1 PERPHB_PINS STR r1 r0 LDR rO EMAC_HSH set the high word of the MAC address LDR r1 MAC_ADDR_H STR r1 r0 LDR rO EMAC_HSL set the low word of the MAC address LDR r1 MAC_ADDR_L STR r1 r0 LDR rO MAC_CTL set the control register for EMAC LDR r1 EMAC_CTL_VAL STR r1 r0 Page 170 LDR rO EMAC_CFG set the configuration register for EMAC LDR r1 EMAC_CFG_VAL STR r1 r0 LDR rO MAC_RBQP store the address of the RBQP buffer to allow for EMAC DMA LDR ri RBQP STR r1 r0 POP r0 r1 r2 r3 r4 r5 restore registers and return BX LR ether_transmit Description ether_transmit outputs the the pbuf chain located at the passed address over ethernet through a DMA write sequence Operation ether_transmit functions by first obtaining the information about the current pbuf packet size next and payload and then transfers all the data in that pbuf to the transmit buffer the function then moves to the next pbuf and repeats unt
122. es to the SSCO interrupt disable register to turn off frame sync interrupts Arguments None Return Values None Page 114 Local Variables rO contains addresses and control words r1 contains addresses and control words Shared Variables None Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global call_ halt call_ halt end the current call Page 115 PUSH r0 r1 save used registers LDR rO SSCO_IDR end ssc interrupts LDR r1 SSCO_IDR_VAL STR r1 r0 POP rO r1 restore registers and return BX LR CodecHandler Description CodecHandler is the event handler called when a frame sync A AQA interrupt on SSCO occurs Codec handler s basic purpose is to read the half word in SSCO s receive holding register and move that half word into a buffer of other received values CodecHandler then takes the next half word in an output buffer and writes it to SSCO s transmit holding register SSCO also checks whether either of these buffers is filled and handles such exceptions accordingly Opera
123. eway address new_status STAT_SET_ GW break default some other key was seen generate an error and leave status unchanged process _error UNKNOWN_KEYCODE_INIT Page 333 new_status cur_status break if got a valid key changed status then output the current IP address if new_status cur_status display_IP IP_address and return the new status return new_status clear_IPAddr Description This function handles the clear key when an IP address is being input It clears the IP address displays the now cleared IP address and returns with the system status it Page 334 was passed unless it was the recalled state If the current status was the recall state then status reverts to the idle state Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status same as current status or the idle state if it was in the recall state Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified June 7 2006 ny Page 335 enum status clear_IPAddr enum status cur_status int key_value variables none clear the IP address and digit count clr_IP_address update the calling IP address set_calling_ IP IP_address
124. extract a chunk of an IP address MAX_16 0x10000 maximum hex value that can be used in display Page 140 equ equ equ equ equ memory address INIT_WAIT 0x8000 number of cycles to wait during display initialization CLEAR_DISPLAY 0x1 value to write to clear the display BOTTOM_ROW OxCO value to write to set display to bottom row DISPLAY_RDY_BIT 0x80 bit indicating whether display is ready or not DISPLAY_RDY 0x0 value of display ready bit indicating display is ready Page 141 PCO OCOEOC ECO CEOECOLOL OEE ECECEE OL OLOL EEE ECEEE ELLE EECECEEEO CO OCECO ECE OCEEC ECOL OLOL OEE ECE ECE LLOEELECEEEEEECLEEECOE display s Initialization and character output for display on VOIP system Table of Contents 1 displaylnit Function used to initialize systems display 2 display_IP Function used to display the decimal equivalent of the passed value 3 display_memory_addr Function used to display passed value in hex 4 display_status Function used to display one of the system s statuses 5 DispBusyCheck Holds until display is ready to accept another command Revision History 2012 2 5 Josh Fromm Initial Revision 2012 2 7 Josh Fromm Code updated to work better 2012 3 29 Josh Fromm Comments updated PCO OCOCO CO CECE LOLOL O EOC EEE OL OLL EEE ECEEE ELL EEECECEEE CO OCECOC CEC OCECEC OL OLOL OEE ECE EEL LEE EEE EEEEEEEECE
125. ey presses can only be detected if they are in the same column The enable pin of U18 is set low by U1 through control of PIOC Display Due to the sensitivity of the display module and the relatively long distance of the ribbon cable connecting it to the board all signals sent to or from the display are buffered by 5V buffers U21 and U22 U21 is bidirectional and has its direction line tied to the buffered NRD signal Because all display data lines pass through U21 data can be both read from and written to the display module U22 is unidirectional and buffers signals from the CPU to display only Because the display module doesn t use the systems address bus AO was chosen to be the display module s register select This means that the status of AO during a read or write determines how the display responds No other address bit is significant when interacting with the display The contrast of the display can be controlled by rotating the knob on the contrast potentiometer located next to the system s reset switch Page 52 Codec The codec interacts with the CPU through the system s synchronous serial controller 0 Because of this it does not interact with U5 U6 or U7 at all Instead it receives all data from the CPU via TDO and sends out data to the CPU via RDO U10 takes in data from the system s microphone jack and converts that data into a digital signal which is sent to the CPU Similarly when the CPU is outputting audio dat
126. finitions for the Atmel AT91RM9200 Revision History 2008 04 23 Arthur Chang Initial Revision 2010 02 01 Joseph Schmitz Modified file received from Arthur Chang to distribute to students 2011 02 13 Glen George Cleaned up commenting removed definitions not related to the AT91RM9200 chip 2012 3 29 Josh Fromm Relevant constants moved in from other include files PO OCOEO CEC CEOCO LOLOL EOC EEE OLE LOE EEC ECEEE ELLE EECECEEEO CO OCEO ECE ECECEC OC LOO OEE ECE EEE LEE ECECEEEEEEE Clock Definitions equ PMC_MCKR Oxfffffc30 Master Clock Page 66 System Mode Definitions equ ARM_MODE_USR 0x10 equ ARM_MODE_FIQ 0x11 equ ARM_MODE_IRQ 0x12 equ ARM_MODE_SVC 0x13 equ ARM_MODE_ABT 0x17 equ ARM_MODE_UND 0x1B equ ARM_MODE_SYS Ox1F equ _BIT 0x80 equ F_BIT 0x40 Static Memory Controller Definitions equ SMCBase OxFFFFFF70 equ SMC_CSRO SMCBase 0x0 equ SMC_CSR1 SMCBase 0x4 equ SMC_CSR2 SMCBase 0x8 equ SMC_CSR3 SMCBase OxC equ SMC_CSR4 SMCBase 0x10 equ SMC_CSR5 SMCBase 0x14 Page 67 User Mode FIQ Mode IRQ Mode Supervisor Mode Abort Mode Undefined Mode System Mode Interrupts disabled Fast Interrupts disabled base address Chip Select O Register Chip Select 1 Register Chip Select 2 Register Chip Select 3 Register Chip Select 4 Register Chip Select 5 Register
127. from overflowing angle 600 ring_busy_timer SAMPLE_RATE SINE_RESOLUTION 600 ring_busy_timer SAMPLE_RATE SINE_RESOLUTION SAMPLE_RATE get the 600 Hz sine wave sig 600 sine_wave angle now get the 120 Hz modulation wave 5 600 Hz 120 Hz sig_120 sine_wave angle 5 the modulation signal should always be positive if sig 120 lt 0 sig 120 sig_120 should the tone be output or should it be silent Page 286 if ring _busy_timer lt BUSY_TONE_TIME outputting the tone make it 13 dBm pli sig_600 sig_120 4096 4 else output no tone store a 0 p i 0 all done filling the buffer return return sine_wave Description This function returns the value of a sine wave for the passed angle units of 360 1024 degrees The returned value is 13 bits Page 287 Operation A table is used to lookup the sine wave The table only covers one quadrant of the sine wave so the argument is first checked to see which quadrant it is in Arguments angle long int angle units of 360 SIN_ RESOLUTION degrees for which to find the value of the sine function Return Value int value of the sine function for the passed angle with the maximum amplitude being 4096 Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Gl
128. ge 109 LDR rO AIC_IECR set up sscO interrupts to trigger AIC interrputs LDR r1 AIC_IECR14_VAL STR r1 r0 LDR rO SSCO_CR enable data to be transmitted and received over sscO LDR r1 SSCO_CR_VAL STR r1 r0 perform a codec reset LDR rO PIOC_PER enable the reset pin LDR r1 PIN_25 STR r1 r0 LDR rO PIOC_OER allow reset pin to output STR r1 r0 LDR rO PIOC_CODR force reset pin low to indicate hardware reset STR r1 r0 now wait for a while to make sure the reset works LDR r1 WAIT_TIME set up counter for wait loop Page 110 LDR r 0x0 when counter is zero wait loop can end ssc0_init_loop ADD rO rO 0x1 increment counter by 1 CMP rO r1 if counter is zero wait loop is over BNE sscO_init_loop otherwise keep waiting LDR rO PIOC_SODR_ set reset pin back to end reset LDR r1 PIN_25 STR r1 r0 POP r0 r1 restore registers and return BX LR call_start rx_buffer_addr Description call_start initializes the shared variables used by audio functions and also starts sscO interrupts so that audio can be input and output Operation Sets shared variables to their in initial value and writes to the SSCO interrupt enable register to trigger interrupts on frame sync signals Page 111 Arguments rO address of first receive buffer Return Values None Local Variables rO contains addresses and contro
129. hich indicates that a key press has occurred Thus PIOC is set to generate an interrupt whenever a RDY signal change is detected It should be noted that the state of data being output by the encoder does not change until another key press is detected Because of the static data output by the encoder there is no sensitive timing involved when interacting with the encoder Instead of a timing diagram like those presented in other subsections a brief description of expected signals will have to suffice When no key is being pressed the encoder U18 will continuously scan the keypad While scanning RDY will be low The data being output by the keypad during this time will be the key code of the last pressed key Pressing a key causes some of the output data lines to go low The keypad is set up so that the QZ 1 key has a key code of 0 while the ENT key has a key code of F The key codes increment by 1 from left to right on each row It should be noted that the relatively large capacitances used to couple the keybounce mask and oscillator pin to ground causes the bounce time on the keypad to be slightly long Page 26 Codec This subsection addresses the input and output of audio signals in the VOIP system The codec used by the system is a Texus Instruments TLV320AIC1106 PCM Codec The schematic of the codec titled ARM Codec can be found on page 5 of the included schematics The codec on this system uses a 13 bit linear filter which mea
130. hing for errors if call_pcb NULL amp amp tcp_close call_pcb ERR_OK error closing the connection report it process_error NETERR_CLOSE there is no longer a connection cur_status CALL_NO_CONNECTION call_pcb NULL and no received data have_rx_data FALSE done closing the connection return return Page 432 tcp_connection_rx Description This function attempts to get received data and returns it in the passed buffer Operation If there is received data it is copied to the passed buffer up to the total data available and the buffer length and TRUE is returned Otherwise FALSE is returned Arguments buf short int pointer to the buffer for the received data len int length of the buffer Return Value char TRUE if there was data and the buffer was filled and FALSE otherwise Input None Output None Error Handling None Page 433 Algorithms None Data Structures None Shared Variables have_rx_data changed checked and set to FALSE rx_data accessed copied to the passed buffer Author Glen George Last Modified March 10 2011 Ph char tcp_connection_rx short int buf int len variables char status return status int i general loop index check if data is available if have_rx_data Page 434 have data copy it into the buffer for i 0 i lt le
131. hrough accesses to keypad s The main loop also displays statuses through interaction with display s Audio buffers are both provided and acquired through interaction with the system s DRAM and the code in audio s The main loop regulates Ethernet input and output through calls to functions in lwIP and ether s The main loop also makes regualre calls to timers s to determine how much time has passed since a previous call e Keypad s Keypad s is the code used to monitor user input from the system s keypad Keypad s uses an interrupt caused by a change in the RDY signal generated by the system s encoder When an interrupt occurs the keypad event handler acquires the key code of the most recent key press and sets variable to save the key code and also sets a flag indicating a key press is available These variables are used to return values to the main loop when the appropriate functions are called e Display s Display s contains all the code used to interact with the system s display module Display s uses calls to genfuncs s to aid in the algorithm used to convert numbers to their ASCII equivalent Display s is capable of displaying a set of statuses that Page 56 can be changed through slight modification of the code any decimal number and any hexadecimal number e Timers s Timers s uses the system s TCO timer counter 0 to trigger an interrupt each millisecond The interrupt handler keeps track of how many interrupts have o
132. iciency it should only be called when packets are available Operation The passed network interface is initialized and then the hardware is initialized Arguments None Return Value None Input None Output None Error Handling If there is no packet available the function returns Algorithms None Data Structures None Page 315 Shared Variables None Author Glen George Last Modified June 9 2009 void ethernetif_input variables struct pbuf p pointer to a received packet struct eth_hdr ethhdr pointer to the packet header get the received packet may be a buffer chain p ether_receive only process the packet if there was one if p NULL have a packet figure out what it is from the header ethhdr p gt payload Page 316 what kind of packet was this switch htons ethhdr gt type case ETHTYPE_IP case ETHTYPE_ARP Page 317 default astandard IP packet update the ARP table if we can etharp_ip_input amp etO p remove the ethernet header to get to IP pbuf_header p s16_t sizeof struct eth_hdr now pass the packet to IP processing which will free it ip_input p amp etO break an ARP packet process it etharp_arp_input amp etO struct eth_addr amp etO hwadd r p buffer is freed by etharp_arp_input break so
133. if this is the second buffer data must be dropped LDR r1 r0 CMP r1 TRUE if neebuf is true then a backup buffer isnt provided BEQ RxDrop otherwise switch buffers normally LDR rO rxaudiocount first reset count of bytes written to buffer LDR r1 0x0 STR r1 r0 LDR rO rxbuff1 set rxbuff1 to contain the address of the next buffer LDR r1 rxbuff2 LDR r2 r1 STR r2 r0 LDR rO rxneedbuf indicate that rx needs a new buffer LDR r1 TRUE STR r1 r0 B Handle_Rx then proceed to read and output data Page 92 RxDrop ran out of buffer space must drop data LDR r0 SSCO_RHR read from receive register and do nothing with data LDRH r1 r0 B TxFullCheck then go on to handle tx Handle_Rx add next received byte to buffer LDR rO rxbuff1 first determine where next received byte will be stored LDR r2 r0 value of base address of buffer loaded LDR rO rxaudiocount base address offset by number of bytes already stored LDR r1 r0 ADD r2 r2 r1 once base and offset are added r2 contains where to store next read byte LDR rO SSCO_RHR now read next receive half word LDRH r1 r0 STRH r1 r2 and store that value in the buffer LDR rO rxaudiocount update count of bytes written to buffer LDR r1 r0 ADD r1 r1 0x2 STR r1 r0 Page 93 then continue to handle the transmit TxFullCheck first determine if current transmit buffer has been completely transmitted
134. il Page 171 a pointer to NULL is found Once finished the function initiates a DMA to transfer the data in the buffer to the ethernet output register If the amount of data in the passed pbuf structure exceeds the size of the transmit buffer the function returns FALSE to indicate and error Otherwise the function returns TRUE to indicate success Arguments rO Address of first pbuf structure to output O A Q Return Values rO TRUE if output with no errors FALSE otherwise Local Variables rO contains addresses and control words r1 contains addresses and control words r2 various uses r3 needed to store pbuf information r4 needed to store pbuf information r5 needed to store pbuf information r6 used for function calls QH r7 used for function calls r8 bit mask Shared Variables ether_tx_buff Global Variables None Input None Output EMAC Page 172 Error Handling Checks for ethernet errors or overflow and returns FALSE if one occurs Registers Changed r0 Stack Depth 9 Algorithms None Data Structures ether_tx_buff Known Bugs None Limitations None Revision Hisotry 3 3 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments updated global ether_transmit ether_transmit PUSH r1 r2 r3 r4 r5 r6 r7 r8 LR LDR r5 Transfer_Buff MOV r1 rO fir
135. initions included are none Revision History Page 297 6 3 06 Glen George Initial revision library include files none local include files include error h process_error Description This function processes the passed error The error is indicated by the value of the passed enumerated type Currently the function does nothing but is here to allow for error handling to be added in the future Arguments e enum error_type type of the error that occurred Return Value None Page 298 Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified May 31 2006 void process_error enum error_type e variables none do nothing for now just return return Page 299 Page 300 OEEREETERALE TE LELEA EE RELA L LE LEER ELEA RATE AEA EARL CT SALE EEEE REEERE EEEE E ERROR H Error Processing Include File ia VoIP Telphone Project hi EE CS 52 PEERERELEEEES EA LERE EEA RARERELEALAL LEEREAERALER EER REE EEEELLAE ERASER ERE EEE EE Of This file contains the error processing definitions for the VoIP Telephone Project This includes constant and enum definitions along with function declarations for the error processing functions defined in error c Revision History 6 3 06 Glen George Ini
136. ions char incoming_call void there is an incoming call char call_connected void other end has connected with us call management functions void initiate_outgoing void initiate an outgoing call Page 295 void start_call void start an outgoing call void connect_incoming void connect to an incoming call void process _cCall void process a continuing call void disconnect_call void end a call IP accessor mutator functions unsigned long int get_calling_IP void const char get_calling_name void void set_calling_IP unsigned long int ip void set_calling_name const char name memory functions void init_memory void initialize the IP address memory system endif Page 296 RERREELERACE RAL EESA CERCLA EE LALA TET TERRE CEREAL ERASE CLS RTOS DERE EE E ERROR Error Processing Functions 7 VolP Telephone Project 7 EE CS 52 JERE EEEE KE EEE KEE KE EREK E E E KAE EE E E E E E E RORE EE EEEE EE E EER EEE KEE EKE EEEE RES EE EEK E This file contains the erro processing functions for the VoIP Telephone Project These functions are called whenever an error occurs Currently they do nothing but they exist to allow error handling to be added to the system The functions included are process _error process the passed error code The local functions included are none The global variable def
137. irritoriiliriit orri lirrilaroalinritoriiloriitorrihiritoroilirr torito tibia MCLK FLEECE GE EEE EEL EEE CFU PEELE lI i i i jij HEEL BMC2 AO fs SMC4 PNC 4 NCS2 l r I3 P SMC16 tSU1 Up SMC13 be tH1 NWR1 OB tSU2 pat tH2 lie 4 oe Data 0 ___ valid 1 Signals and timings used for interaction with display module Page 24 Signal Name Signal Description Signal Time ns SMC 2 MCK Falling to NLB AO Valid 7 5 tSU1 R W and RS Setup Time 40 tSU2 Data Setup Time 80 tPD PLD Propagation Delay 25 tC Cycle Time 500 tH1 R W and RS Hold Time 10 tH2 Data Hold Time 10 Page 25 Explanation of signals and timings of display interaction Keypad This subsection covers the keypad and encoder chip used by the VOIP system The keypad used is modeless it is made in Hong Kong though and has a 4x4 key matrix The encoder used is a Fairchild Semiconductor MM74C923 20 Key Encoder The schematic for both the encoder and keypad can be found on page 4 titled ARM Keypad of the included schematics The keypad interacts directly with only the encoder the encoder handles debouncing key presses as well as the scanning of rows of the keypad and converts key presses into a code which is then sent to the CPU The CPU receives the data on the pins PIOC26 PIOC27 PIOC28 PIOC29 and PIOC31 PIOC31 is the RDY signal generated by the encoder w
138. its that aren t from keypad data Page 204 AND rO r1 rO LSR rO Datshiftval shift read value to lowest 4 bits this gives final keycode CMP rO SHIFT_KEYCODE if the keypress was a shift key must treat specially BEQ have_shift_key BNE no_shift_key no_shift_key current keypress is not the shift key treat normally LDR r1 keyvalue save acquired keycode STR 0 r1 LDR rO keypressed set keypressed to true to indicate a key was pressed LDR ri TRUE STR r1 r0 B KeypadPressHandlerDone function can return have_shift_key current keypress is shift key must switch status of shift without updating current keycode or key pressed status LDR rO shiftkey load value of shift key LDR r4 r0 EOR r1 r1 TRUE invert and store that value Page 205 STR r4 r0 B KeypadPressHandlerDone interrupt can end KeypadPressHandlerDone LDR rO PIOC_ISR read the value of the interrupt status register to allow future interrupts LDR r1 r0 LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt LDR r1 TRUE STR r1 r0 POP r0 r1 restore registers LDMFD SP PC key_available Description This function returns the value sotred in keypressed This indicates whether a key has been pressed The value is returned in rO Page 206 Operation Loads and returns the value in keypressed Arguments None Return Values rO TRUE if a key p
139. keyproc h include callutil h no_action Description This function handles a key when there is nothing to be done It just returns It is needed to fill in the key processing table Arguments cur_status enum status the current system status Page 357 key_value int value of the key that was input ignored Return Value enum status the new status same as current status Input None Output None Error Handling None Algorithms None Data Structures None Global Variables None Author Glen George Last Modified June 3 2006 enum status no_action enum status cur_status int key_value variables none Page 358 return the current status return cur_status JA reset_input Description This function handles keys which cause the input state to be reset The function resets the calling IP address and returns idle as the new state Arguments cur_status enum status the current system status key_value int value of the key that was input ignored Return Value enum status the new status always STAT_IDLE Input None Output None Page 359 Error Handling None Algorithms None Data Structures None Global Variables None Author Glen George Last Modified June 3 2006 enum status reset_input enum status cur_status int key_value variables none reset th
140. l words r1 contains addresses and control words Shared Variables rxbuff1 txaudiocount rxaudiocount txneedbuf rxneedbuf Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures rxbuff1 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created Page 112 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global call_ start call_start sets up registers and variables needed for codec and SSC to run PUSH r0 r1 LDR r1 rxbuff1 store passed receive buffer address STR rO r1 LDR rO txaudiocount set transmit buffer to be full prevents sending until a new transmit buffer is passed LDR r1 AUDIO_BUFLEN STR r1 r0 LDR rO rxaudiocount set receive buffer to empty LDR r1 0x0 STR r1 r0 LDR rO txneedbuf indicate a new transmit buffer is needed LDR r1 TRUE STR r1 r0 Page 113 LDR rO rxneedbuf indicate a new receive buffer is needed LDR r1 TRUE STR r1 r0 LDR rO SSCO_IER enable frame sync interrupts to occur LDR r1 SSCO_IER_VAL STR r1 r0 POP r0 r1 restore registers and return BX LR call_halt Description call_halt disables frame sync interrupts to that no more audio data is input or output Operation Writ
141. lid_Key if keypress is invalid then keep looping until a valid key code is read BEQ invalidkeyloop POP r1 restore used register and return BX LR The Data Segment data Page 211 keypressed word keyvalue word shiftkey word end Page 212 variable indicating whether a key press is available variable containing the key code of the most recent key press variable indicating whether the keypad is in a shifted state timers inc Constants used to run the timer functions in timers s Revision History 2012 3 6 Josh Fromm Initial Revision equ DRAM_REFRESH_RATE 0x3 refresh DRAM every 4 milliseconds equ DRAM_CHUNK 0x40 number of reads that must take place to refresh 1 4th of the DRAM Page 213 PCO OCOEO ECO CEEOL OOO ECO ECECECE OL OLOL EEE ECEEE EOL EEE ECEEEO CO OCEOC ECE ECEEC OL OLOL OEE ECE EEL LEE EEE EEECELEEECE timers s Initialization event handling and basic functions of VOIP timers Table of Contents 1 TimerOlnit Initializes TCO and causes it to trigger interrupts every millisecond 2 TimerOHandler Increments the counter used by elapsed_time to determine how many milliseconds have passed Also reads from 1 4th of the columns inthe system s DRAM to refresh them 3 elapsed_time Returns the number of milliseconds since elapsed tine was last called Revision Hist
142. ll show the message Set Gateway Page 8 Black Circle Memory Save When the phone is off hook and an IP address is entered pressing Memory Save will allow the user to save that IP address for later referencing When pressed Memory Save requires that the user enter a number between 0 and 15 16 addresses can be saved in total After a number between 0 and 15 is entered the Enter key is pressed to finalize the function When Memory Recall is pressed and the number entered the saved IP address will be displayed Memory Save causes the message Memory Save to be displayed GHI 4 Memory Recall When Memory Recall is pressed the user can enter a number between 0 and 15 to display a previously saved IP address Once the number is displayed Enter must be pressed Memory Recall causes the message Memory Recall to be displayed PRT Shift Shifts the keypad back to the unshifted state All Other Keys Nothing When shifted other keys will do nothing Besides the display and keypad the system has several other ways the user can interact with the system The reset switch allows the user to reboot the system by holding down the switch for around 5 seconds The mute switch causes both incoming and outgoing sound to be muted The display contrast dial allows the user to control the contrast of the display Each of the other user interface options is shown in the following picture
143. lso monitors the JTAG reset and reset lines to produce a signal indicating when a debug reset should be performed Finally this PLD inverts NCS2 to create an active high chip select for the system s display Revision History a 20 January 2012 Josh Fromm Initial Version S 24 January 2012 Josh Fromm Buffer Logic Added 26March 2012 Josh Fromm Updated Comments Pins JTAGRST PIN 2 input One of the signals to be sent into not nor gate NRST PIN 3 input Other signal to be sent into not nor gate BJTAGRST PIN 23 ISTYPE com output Output of not nor gate NCSO PIN 4 input chip select for rom NCS1 PIN 5 input chip select for sram NRD PIN 6 input signal indicating data is incoming Page 49 US5DIR PIN 22 ISTYPE com output which direction data buffer should transmit in U50E PIN 21 ISTYPE com output whether data buffer is enabled or not NCS2 PIN 7 input to display should be inverted E PIN 20 ISTYPE com output inversion of ncs2 equations IBJTAGRST JTAGRST NRST If either a JTAG reset or regular reset occurs the debugger should be reset U50E NCSO NCS1 The data buffer should be disabled during an access of either ROM or SRAM U5DIR NRD during a read data buffer should buffer from peripherals to the CPU E INCS2 output enables BJTAGRST OE 1 always enable not nor gate U50E OE 1 always enable buffer logic outputs U5DIR OE 1 E OE 1 always invert ncs2
144. me other kind of packet ignore it just free the memory pbuf_free p p NULL no packet break done processing the input packet if there was one return return ethernetif_output Description This function outputs the passed packet over the ethernet interface and then frees the memory for the packet Note that the passed packet could be in a pbuf chain not ina single pbuf Operation The passed packet is output via the low level output function and then the packet is freed Arguments etx struct netif pointer to the network interface over which the packet is to be Page 318 output ignored b struct pbuf pointer to the packet chain to output Return Value err_t ERR_OK if the packet is successfully output or ERR_IF if there is an error outputing the packet Input None Output None Error Handling If there is an error outputing the packet ERR_IF is returned and the passed buffer is still freed Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified June 9 2009 a err_t ethernetif_output struct netif etx struct pbuf b Page 319 variables char err whether or not there was an error send the packet watching for an error err lether_transmit b error or not free the packet if there was one if b NULL pbuf_free b return whether
145. me void networking functions char ether_init void char ether_transmit struct pbuf char ether_rx_available void struct pbuf ether_receive void endif Page 469 Page 470
146. mm Comments updated global call_ start call_start sets up registers and variables needed for codec and SSC to run PUSH r0 r1 LDR r1 rxbuff1 store passed receive buffer address STR rO r1 LDR rO txaudiocount set transmit buffer to be full prevents sending until a new transmit buffer is passed LDR r1 AUDIO_BUFLEN STR r1 r0 LDR rO rxaudiocount set receive buffer to empty LDR r1 0x0 STR r1 r0 LDR rO txneedbuf indicate a new transmit buffer is needed LDR r1 TRUE STR r1 r0 Page 86 LDR rO rxneedbuf indicate a new receive buffer is needed LDR r1 TRUE STR r1 r0 LDR rO SSCO_IER enable frame sync interrupts to occur LDR r1 SSCO_IER_VAL STR r1 r0 POP r0 r1 restore registers and return BX LR call_halt Description call_halt disables frame sync interrupts to that no more audio data is input or output Operation Writes to the SSCO interrupt disable register to turn off frame sync interrupts Arguments None Return Values None Page 87 Local Variables rO contains addresses and control words r1 contains addresses and control words Shared Variables None Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None
147. mory location number is being input It adds the passed key value to the current value of the memory location number If there is an overflow value larger than MEMORY_SIZE the error handler is called and the key is ignored The function returns with the system status it was passed Arguments cur_status enum status the current system status key_value int value of the input key Return Value enum status the new status same as current status Input None Output None Error Handling If the input causes the memory location number to be to large greater than MEMORY_SIZE the error handler is called with the error MEMORY_ADDRESS_OVERFLOW and the key is ignored Page 398 Algorithms None Data Structures None Shared Variables memloc changed updated to new memory location number based on the passed key value Limitations Does not work for memory sizes greater than 6553 Author Glen George Last Modified June 3 2006 enum status add_memDigit enum status cur_status int key_value variables none check if there is room for the digit if 10 memloc key_value lt MEMORY_SIZE have room for the digit add it in to the current location Page 399 memloc 10 memloc key_value else too big of a value call the error handler process _error MEMORY_ADDRESS_OVERFLOW display the new memory location number
148. mplements a DRAM controller that uses state bits to generate the timing needed for read and write cycles The device outputs 4 signals a select for multiplexers an active low write enable a RAS signal and a CAS signal It takes NWRO and NCS3 as inputs This logic is implemented as a Moore state machine Revision History S 2 18 2012 Josh Fromm Initial Version pins Clock PIN in global clock pin NWRO PIN 2 in read or write data NCS3 PIN 3 in DRAM chip select RAS PIN 14 ISTYPE reg out RAS signal for DRAM CAS PIN 15 ISTYPE reg out CAS signal for DRAM Page 34 SEL PIN WE PIN StBitO PIN StBit1 PIN StBit2 PIN 16 17 18 19 20 ISTYPE reg out ISTYPE reg out ISTYPE reg out ISTYPE reg out ISTYPE reg out state machine definitions SBITS Start 0 0 O O Idle State1 State2 Write3 Write4 WriteS Write6 Write7 Write8 Read3 Read4 Read5 Read6 Page 35 1 1 I RAS CAS SEL WE StBitO StBit1 StBit2 0 0 OJ 1 O O 0O 1 1 1 1 1 0 O OJ 0 0 O O 0 1 1 0 0 O 1 0o 0 1 OJ 0 O 1 1 0 0 O OJ 1 0 0 1j 1 1 Oy 1j 1 0 0 1 1 0 1 OJ Mux select signal Write or read signal state bit O state bit 1 state bit 2 state bits state assignment boot up state waiting for dram to be selected first state of both cycles secon
149. n amp amp i lt AUDIO_ BUFLEN i buf i rx_data i no longer have data already copied have_rx_data FALSE and the data was successfully copied status TRUE else no data to copy return FALSE status FALSE return whether or not any data was actually received return status Page 435 tcp_connection_tx Description This function attempts to send the passed data over the TCP connection Operation A packet is created for the passed data and it is sent over the connection If there is an error sending the packet the error handler is called and FALSE is returned Arguments buf short int pointer to the buffer with the data to be sent 16 bit values len int length of the buffer number of 16 bit values Return Value char TRUE if the passed data was successfully sent and FALSE otherwise Input None Output None Error Handling If there is an error sending the packet FALSE is returned and the process_error function is called with Page 436 the error NETERR_SEND Algorithms None Data Structures None Shared Variables call_pcb accessed used to send the data packet Author Glen George Last Modified March 10 2011 Ph char tcp_connection_tx short int buf int len variables char packet AUDIO_BUFLEN 2 1 packet to send char status return status int i general loop i
150. n History 2012 2 5 Josh Fromm Initial Revision Pin Definitions equ KeyDato 0x04000000 bit corresponding to data line O of keypad equ KeyDatt1 Ox08000000 bit corresponding to data line 1 of keypad equ KeyDat2 0x10000000 bit corresponding to data line 2 of keypad equ KeyDat3 0x20000000 bit corresponding to data line 3 of keypad equ KeyDatAll 0x3C000000 bit corresponding to all data lines of keypad equ KeyOE 0x40000000 bit corresponding to enable line of keypad equ KeyRDY Ox80000000 bit corresponding to ready line of keypad equ ALL_PINS OxFFFFFFFF all PIOC bits PIO Control Words equ Key _Enable OxFCO00000 enables keypad pio pins equ PID_4 Set 0x00000010 used to initialize clock for PID 4 Page 194 equ equ SMR_SET 0x00000060 AIC_IECR_KEYS 0x11 control word to enable PIOC interrupts General Definitions equ equ equ equ equ Invalid_Key OxFF Datshiftval Ox1A amount read data must be shifted to give correct key code SHIFT_KEYCODE 0x7 SHIFT_VALUE 0x10 value to be added to shifted keys equal to the number of keys on the keypad SYS_BIT 0x2 bit corresponding to system interrupts Page 195 PO OOO ECO CEEOL OOO ECO ECECECE ECL OLOL EEE ECEEE ELL EEE ECEEEO CO OCEOC ECE ECEEC OL OLOL OEE ECE EEL LEE EEE EEECELEEECE keypad s Initialization event handling and functions of VOIP keypad Table of Contents
151. n rxbuff2 Known Bugs None Page 128 Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global update_rx update_rx PUSH r1 r2 save used registers LDR r1 rxneedbuf check if a new buffer is needed LDR r2 r1 CMP r2 TRUE BNE update_rx_nobuf if not end function BEQ new_rx_buff otherwise get the new buffer new_rx_buff LDR r1 rxbuff2 store passed pointer in spot allocated to back up buffer STR rO r1 LDR ri rxneedbuf indicate a buffer is no longer needed LDR r2 FALSE STR r2 r1 Page 129 LDR rO TRUE set output to show that the buffer was taken B update_rx_done function can end update_rx_nobuf no update is needed LDR rO FALSE set return value to show no update was needed B update_rx_done update_rx_done restore registers and return POP r1 r2 BX LR The data segment data txbuff1 contains address of active transmit buffer word txbuff2 contains address of backup transmit buffer word rxbuff1 contains address of active receive buffer word rxbuff2 contains address of backup receive buffer Page 130 word txaudiocount number of bytes transmitted from current transmit buffer word rxaudiocount number of bytes moved into current receive buffer word txneedbuf whether a new tran
152. ndex create the packet Page 437 packet type is data D packet 0 D copy the data from the passed buffer for i 0 i lt len amp amp i lt AUDIO_BUFLEN i break the passed 16 bit values into bytes packet 2 i 1 buf i gt gt 8 amp OxFF packet 2 i 2 buf i amp OxFF now send the packet watching for errors if tcp_write call_pcb packet sizeof packet 1 ERR_OK error sending the packet report it process_error NETERR_SEND remember that there was an error status FALSE else no error status TRUE Page 438 done sending the data return whether we were successful or not return status utility functions check_for_close Description This function checks if the call connection has been closed most likely by the remote system and if so cleans up Operation The state of the TCP connection is checked and if it is closed the connection is closed at this end and the shared variables are reset to no call Page 439 Arguments None Return Value None Input None Output None Error Handling If there is an error closing the connection the process error function is called with the error NETERR_CLOSE Algorithms None Data Structures None Shared Variables call_pcb changed checked and possibly set to NULL cur_status changed possibly reset
153. nds have passed since DRAM was used to refresh the systems DRAM Each of these counts is incremented by one when the function is called The function also reads from 1 4th of the DRAM to keep that section refreshed Operation TimerOHandler first increments elapsed_time_count by 1 Next TimerOHandler determines which address of DRAM to begin reading at by multiplying the value in DRAM_count by the number of columns that are read each millisecond TimerOHandler then reads from the calculated addresses of DRAM Finally TimerOHandler checks if the value in DRAM_count has reached QB B HB QB QB amp its maximum value and sets it back to 0 if it has Arguments None Return Values None Local Variables rO addresses r1 control words Shared Variables DRAM_count elapsed_time_count Page 219 Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Words Algorithms None Data Structures None Known Bugs None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision TimerOHandler SUB LR LR 4 first correct systems pipeline STMFD SP LR save link register and other used registers PUSH r0 r1 r2 LDR rO elapsed_time_count increment the count of elapsed milliseconds since last elapsed_time function call LDR r1 r0 ADD r1 r1 0x1 Page 220 ST
154. ne if status needs to be updated LDR r1 r0 CMP r2 r1 BEQ display_status_done if not function is over STR r2 r0 then update last status BL DispBusyCheck check if display is ready LDR rO DISP_CS if so clear the display LDRB r1 CLEAR_DISPLAY Page 157 STRB r1 r0 ADR r1 DispStringArray next determine which status is to be displayed LSL r2 0x4 convert offset from byte offset to table offset ADD r1 r1 r2 find address string begins at LDR r2 DISPLAY_WRITE address of register to be written to output display_status_loop LDRH rO r1 load a half word from the string to display MOV r3 rO AND r3 r3 LOW_BYTE_MASK CMP r3 ASCII_NULL if low byte is ascii null string is over BEQ display_status_done jump to end of function if string done BL DispBusyCheck block until display is ready STRB r3 r2 otherwise output to display LSR rO 0x8 check if byte following the one just output is a null CMP rO ASCII_NULL BEQ display_status_done if so function is done BL DispBusyCheck if not wait to make sure display is ready for for another character STRB rO r2 then display that character Page 158 ADD r1 r1 HALFWORD_SIZE increment byte to be displayed by 1 B display_status_ loop and repeat display_status_done restore registers and return POP r0 r1 r2 r3 LR BX LR DispBusyCheck Description DispBusyCheck reads from the display modules status regis
155. ns that the VOIP system can only interact with other systems using the same filter mode The codec is set to use Serial Synchronous Controller 0 of the CPU The expected waveforms of PCMI and PCMO are modulated and sinusoidal assuming audio data is being transferred Because the codec expects an input clock frequency of around 2 megahertz the CPU is set to generate a frequency of the master clock divided by 36 2 08 megahertz on the pin TKO The frame sync signal TFO is set to be generated every 256 cycles of the divided master clock Following is a diagram of codec signals where TCK is the divided master clock and FSYNC is the frame sync signal Ops 200ns 400ns 600ns 800ns lus 1 2us 1 4us 1 6us 1 8us 2us 2 2us NVTULANUNINRENUATORTAUUOTATNUDATRTRANRTAINEUUANRURONTORONURATRINUGHTRTANUNTATNNVATRNUAUNTEATRUEATRONUTRTREN NTR TRT RUAN THT TCK _7 w F uo 7 too 7 w 7 w td tH td k tSU1 FSYNC o td td tSU PCMI e a tH PCMI td td pem 115 0 0 td 5 PCMO Fe Diagram of codec signals and timings Signal Name Signal Description Signal Time ns tSU1 Setup time PCMSYN high 20 before MCLK low tH Hold time PCMSYN high after 20 MCLK low Page 27 tSU PCMI Setupt time PCMI high or low before MCLK low 20 Signal Name Signal Description Signal Time ns tH PCMI Hold time PCMI high or low 20 after MCLK l
156. nt check if the value in DRAM_count is at its maximum value LDR r1 r0 CMP r1 DRAM_REFRESH_RATE BNE DRAMCountInc increment DRAM if cycle shouldnt be reset LDR r1 0x0 if DRAM_count is maximum value set it back to 0 STR r1 r0 B TimerOHandlerDone DRAMCountInc increment DRAM_count by 1 LDR r0 DRAM_count load value in DRAM_count LDR r1 r0 ADD r1 r1 0x1 add1 STR r1 r0 store new value BTimerOHandlerDone function can finish TimerOHandlerDone LDR rO TCO_SR read timer O status register to reset interrupt status LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt LDR r1 TRUE Page 234 STR r1 r0 POP r0 r1 r2 restore used registers LDMFD SP PC then return elapsed_time Description This function returns the number of milliseconds since it was last called Operation Each millisecond TimerOHandler increments elapsed_time_count This means that elapsed_time simply needs to return the value in that shared value and then reset it Arguments None Return Values rO milliseconds since function was last called Local Variables rO addresses r1 general purpose r2 general purpose Shared Variables elapsed_time_count Global Variables None Input None Output None Error Handling None Registers Changed None Page 235 Stack Depth 2 Words Algorithms None Data Structures None Known Bugs
157. nterface given by ETHER_INTF the error handler is called with the error UNKNOWN_ETHER_NAME Algorithms None Data Structures None Page 345 Shared Variables None Author Glen George Last Modified March 10 2011 enum status set_IP enum status cur_status int key_value variables ifndef NO_LWIP empty function if there is no LWIP code struct netif net_intf network interface to access struct ip_addr_ ip the new IP address create the IP address in network order ip addr htonl get_calling_IP now get the network interface for our device net_intf netif_find ETHER_INTF check if got an interface Page 346 if net_intf NULL got the interface set the IP address netif_set_ipaddr net_intf amp ip else no interface report the error process error UNKNOWN_ETHER_NAME endif need to restart the connection tcp_connection_restart done so return with idle as the status return STAT_IDLE set_gateway Page 347 Description This function handles setting the gateway address to the address entered thus far The status is always returned as idle Operation The function calls the TCP IP stack functions to set the gateway to the just entered IP address Then the TCP connection is restarted Arguments cur_status enum status the current system status ignored key_value int val
158. ock divided by 32 2 34 megahertz To interact properly with the PHYTER chip a large majority of PIOA is converted to peripheral A and a large majority of PIOB is converted to peripheral B The signals of the main data lines RXD_O RXD_1 TXD_O TXD_1 etcetera should appear to be very noisy if monitored during use due to the high speed of data transmission The PHYTER chip is set to run in advertised mode at 10BASE T speed with either half or full duplex The PHYTER also is set to run in MII MAC interface mode Page 45 Detailed Description of Hardware This section offers a description of the explicit purpose of each chip in the system Chips will be referenced by the component label assigned to them in the schematics Following is a memory mapping that better shows addresses of peripherals than the previous memory mapping Also a board layout with chip labels is provided ARM Memory Mapping EE52 Josh Fromm Internal Memory Mapping 0x0000 0000 Boot Memory 1 MB 0x0010 o000 0Xx0020 0000 SRAM 1 MB Address Memory Space 0x0030 0000 USB Host User Interface 1 MB 0x0000 0000 0x0040 0000 OXOFFF FFFF Internal Memories 256 MB Eaa 256 MB Undefined 248 MB 2 naetine 2 Bebb BGG 256 MB 0x0050 0000 256 MB 256 MB User Peripheral Mapping System Peripheral Mapping 256 MB 256 MB OXFFFA 0000 16 KB Reserved 2
159. one Error Handling None Registers Changed rO Stack Depth 2 Algorithms None Data Structures buffer stored at address in txbuff2 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated Page 98 global update_tx update_tx PUSH r1 r2 save used registers LDR r1 txneedbuf determine if a new buffer is needed LDR r2 r1 CMP r2 TRUE BNE update_tx_nobuf if no buffer is needed return false BEQ new_tx_buff ifa buffer is needed move to buffer handling process new_tx_buff accept the new buffer LDR r1 txbuff2 handle by adding passed buffer to buffer two spot STR rO r1 LDR r1 txneedbuf indicate a buffer is no longer needed LDR r2 FALSE STR r2 r1 LDR rO TRUE indicate update was needed Page 99 Bupdate_tx_done function is done update_tx_nobuf a new buffer is not needed LDR rO FALSE set return value to indicate an update was un needed Bupdate_tx_done function is done update_tx_done pop registers and return POP r1 r2 BX LR update_rx new_buffer_addr Description update_rx checks whether a new buffer to store incoming audio data in needed A buffer is needed when one or both of the stored buffers has been filled with audio data If this is the case the function acc
160. ontains vectors that should cause the code stored on U22 to be executed The code sets up chip selects 0 and 1 and then copies all the data on U3 to U2 The code then sets the program counter to the lowest address in U2 Ox20000000 The code stored on U3 is the code needed to run the entire board The data lines between U1 and U2 and the data lines between U1 and U3 are connected directly as are the address lines The control lines however go through U6 While running U2 is used as the system s code storage and variable storage All other peripherals have data control and address lines from the CPU first pass through U5 U6 and U7 respectively The buffers are bidirectional but U6 and U7 have their enable and direction pins tied so that control and addresses are always buffered from the CPU to the peripherals Because data must be bidirectional U5 relies on U8 to control the direction and output U8 is a programmable logic device that monitors chip selects 0 and 1 to determine whether U5 should be enabled or not it s enabled when the chip selects are inactive and monitors NRD to determine direction NRD active implies a read which sets U5 to buffer from peripherals to the CPU The following several pages contain the code in ABEL used to program U8 Page 48 MODULE MainPLD TITLE Reset and Buffer Logic Device GAL22V10D This PLD is used to control whether data buffer U5 is enabled and the direction of buffering It a
161. or Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments updated global Keypadinit Keypadinit Page 198 KeypadInit sets up the registers needed to run the keypad functions PUSH r0 r1 save used registers LDR rO PIOC_PER enable PIOC pins LDR r1 ALL_PINS STR r1 r0 LDR rO PIOC_ODR_ Disable output on all PIOC Lines LDR r1 ALL_PINS STR r1 r0 LDR rO PMC_PCER Enable clock for PIOC LDR r1 PID_4 Set STR r1 r0 LDR rO PIOC_IER set key ready pin to be an interrupt LDR r1 KeyRDY STR r1 r0 LDR rO PIOC_SODR_ allow keypad data lines to be read by CPU LDR r1 KeyDatAll STR r1 r0 Page 199 LDR rO PIOC_OER Enable output for output enable pin LDR r1 KeyOE STR r1 r0 LDR rO PIOC_CODR Set output enable to low active for keypad STR r1 r0 LDR rO AIC_SMR4 set priority for PIOC interrupts LDR r1 SMR_SET STR r1 r0 LDR rO AIC_SVR4 set pio C interrupt to go to keypad event handler LDR r1 KeypadPressHandler STR r1 r0 LDR rO AIC_IECR enable PIO C interrupts LDR r1 AIC_IECR_KEYS STR r1 r0 LDR rO AIC_IDCR disable system interrupts These were causing some problems by triggering for seemingly no reason LDR r1 SYS_BIT
162. ory 2012 3 6 Josh Fromm Initial Revision 2012 3 29 Josh Fromm Comments Updated PCO OCOOC CO CEEOL OLO OEE EC ECECECOLLEOL EEE CEE EE LOLEEECECEEEO CO COCO CEC OCECEC OL OLOL EEE ECE EEL LEE ECEEEEEEOEEECE include at91rm9200 inc include armvoip inc Page 214 include timers inc text arm align 2 TimerOlInit Description This function sets up timer O of the system to cause an interrupt every millisecond The function also installs the timer 0 event handler that is called when a timer O interrupt is detected Shared variables used by timer functions are also set up Operation TimerOlnit sets up timer and AIC registers with the needed control words Arguments None Return Values None Local Variables rO addresses r1 control words Shared Variables DRAM_count elapsed_time_count Global Variables None Input None Output None Page 215 Error Handling None Registers Changed None Stack Depth 2 Words Algorithms None Data Structures None Known Bugs None Limitations None Revision History 3 6 2012 Josh Fromm Initial Revision 3 29 2012 Josh Fromm Comments Updated global TimerOlnit TimerOlInit PUSH rO r1 save used registers LDR rO DRAM_START first write to beginning of dram this helps stabilize the dram for some reason LDRB r1 0x12 STRB r1 r0 LDR rO
163. ow tdx Synchronization delays 0 Page 28 Explanation of signals and timings of codec interaction DRAM This subsection addresses the dynamic random access memory used by the VOIP system The system uses a Mitsubishi MH25609J 10 256K x 9 bit DRAM module The schematic for DRAM titled ARM DRAM can be found on page 7 of the included schematics Due to the complexity of interacting with DRAM a PAL22V10D programmable logic device U12 is used to generate the necessary signals U12 is provided with a clock frequency of 18 75 megahertz which is generated on PIOA4 set to be a programmable clock Rather than use a dedicated refresh cycle on the PLD the system instead reads from every row address the DRAM every 4 milliseconds to prevent stored data from degrading Address lines from the CPU are multiplexed by three Texas Instruments 74HC245N multiplexers The signal controlling which address chunk goes to DRAM is controlled by the PLD and is called MUX1 when the signal is high for A9 A17 to go through or MUX2 for AO A8 to go through The following diagrams show the expected waveforms of signals from the CPU to the PLD and from the PLD to the DRAM module It should be noted that the CPU is set to have 24 wait states 7 read write hold states 4 read write setup states and 3 address to chip select cycles when interacting with chip select 3 DRAM Read cycles will be addressed first Page 29 Ops 100ns 200ns 300ns 400ns
164. pedefs status of the TCP connection enum tcp_conn_status CALL_NO_CONNECTION no connecton CALL_CONNECTING trying to setup a full connection Page 460 CALL_RINGING have connection it s ringing CALL_BUSY have connection it s busy CALL_CONNECTED have connection can talk function declarations status functions char have_tcp_connection void have incoming connection enum tcp_conn_status tcp_connection_status void get status connection functions void tcp_connection_answer void answer an incoming connection void tcp_connection_close void close the connection void tcp_connection_connect unsigned long int connect to an IP address void tcp_connection_init void initialize connection void tcp_connection_restart void restart a connection receive transmit functions Page 461 char tcp_connection_rx short int int try to receive data char tcp_connection_tx short int int try to transmit data endif Page 462 REE EEF ERLE EEL LEPA EREE EREEREER EE KE EEEE EEE Le Ce EEKE EE EEE EEE EE EEEE EREE KE EREE VOIPDEFS H General Definitions Include File ia VoIP Telphone Project hi EE CS 52 By JETEREEEEERTAEEEREEEEKEEEEEEREEREEEEEEREEREEEERREEEEEEERERKEEEEEREEEEEEE EREA E This file contains the general definitions for the VoIP Telephone
165. pes enum keytype KEYTYPE_DIGIT lt 0 gt lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt KEYTYPE_ESC lt ESC gt KEYTYPE_BS lt Backspace gt KEYTYPE_SEND lt Send gt oy KEYTYPE_OFFHOOK Off Hook KEYTYPE_ONHOOK On Hook KEYTYPE_SETIP lt Set IP gt KEYTYPE_SETSUBNET lt Set Subnet gt ay Page 467 KEYTYPE_SET_GW lt Set Gateway gt KEYTYPE_MEMSAVE lt Memory Save gt KEYTYPE_MEMRECALL lt Memory Recall gt KEYTYPE_UNKNOWN unknown key type NUM_KEYTYPES number of key types declare the ethernet buffer if not using LWIP code ifdef NO_LWIP struct pbuf struct pbuf next endif function declarations update needed functions unsigned char update_rx short int record data update unsigned char update_tx short int play data update keypad functions unsigned char key_available void key is available int getkey void get a key Page 468 display functions void display_IP unsigned long int display the track time void display_memory_addr unsigned int display the track number void display_status unsigned int display the system status audio functions void call_start short int start playing void call_halt void halt play or record timing function int elapsed_ti
166. r of 16 is divided by 16 and the division repeats itself until the last digit is output Arguments rO Value to output as an IP address to the display Local Variables rO division remainder r1 division quotient r2 power of 16 r3 remainder of address Shared Variables None Global Variables None Input None Output Displays a memory address on the bottom row of the display module Error Handling None Registers Used None Stack Depth 5 words Algorithms Repeatedly divide by powers of 16 to get digits and remainders needed for next division Data Structures Arrays for output string Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision 2 7 2012 Josh Fromm Updated to function better Page 152 3 29 2012 Josh Fromm Comments updated global display_memory_addr display_memory_addr display_addr_Init PUSH r0 r1 r2 r3 LR MOV r3 rO save passed address LDR rO DISP_CS_ first change display address to be bottom row LDR r1 BOTTOM_ROW STRB r1 r0 LDR r2 MAX_16 prepare for display loop by setting power of 16 display_addr_Main MOV ri r2 first set denominator to be the current power of 16 MOV r0O r3 set numerator to be binary value of address BL Divide divide numerator by denominator MOV r3 r0 store remainder as remaining address value CMP r1 0xA if quotient is greater than 10 conversion to ASCII i
167. r0 DISP_CS begin initialization of display LDRB r1 Ox30 write first value to display STRB r1 r0 LDR r2 0x0 set counter to 0 this is needed to allow enough time between display initialization instructions DispWaitLoop1 ADD r2 1 increment counter CMP r2 INIT_WAIT BNE DispWaitLoop1 loop until sufficient cycles have passed STRB r1 r0 write same value to display again LDR r2 0x0 set counter to 0 this is needed to allow enough time between display initialization instructions DispWaitLoop2 wait for a while again ADD r2 1 CMP r2 INIT_WAIT Page 145 BNE DispWaitLoop2 loop until sufficient cycles have passed STRB r1 r0 write same value to display for a third time other instructions do not require a wait time and can be run in succession LDRB r1 0x08 STRB r4 r0 BL DispBusyCheck make sure display is ready for another value LDRB r1 Ox01 STRB r4 r0 BL DispBusyCheck make sure display is ready for another value LDRB r1 0x06 STRB r4 r0 BL DispBusyCheck make sure display is ready for another value LDRB r1 OxOF STRB r4 r0 BL DispBusyCheck make sure display is ready for another value LDRB r1 0x3F activate display with blinking and cursor location STRB r1 r0 Display is now initialized running LDR rO Last_Status initialize last status register Page 146 LDR r1 OxFF set last status to a value that can not be reached STR r1 r0 POP r0 r1 r2
168. r1 output next half word in buffer LDR rO txaudiocount update number of bytes read from buffer LDR r1 r0 ADD r1 r1 0x2 STR r1 r0 function is now done CodecHandlerDone LDR rO SSCO_SR read sscO status register to reset it LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt LDR r1 TRUE Page 96 STR r1 r0 POP r0 r1 r2 restore registers and return LDMFD SP PC update_tx new_buffer_addr Description update_tx checks whether a new buffer of outgoing audio data is needed A buffer is needed when one or both of the stored buffers has been emptied of audio data If this is the case the function accepts the passed buffer address and returns true If no buffer is needed the function returns false Operation update_tx simply checks the statuses of shared variables to determine whether a new buffer is needed then updates shared variables to indicate a new buffer has been accepted or does nothing to indicate no new buffer has been accepted A QB AQ Arguments rO address of available transmit buffer Return Values rO TRUE if passed buffer was accepted FALSE if not Page 97 Local Variables rO contains addresses and variable values r1 contains addresses and variable values r2 contains addresses and variable values Shared Variables txneedbuf txbuff2 Global Variables None Input None Output N
169. r7 keep track of how much data has been transferred CMP r2 r4 if all the data in the buffer is transferred function is done BNE receive_main if not continue transferring POP r2 r3 restore address of payload restore address of RBQP chunk addresss LDR r4 OWNERSHIP_MASK filter out the ownership bit only leave wrap bit AND r2 r2 r4 ADD r3 r3 WORD_ SIZE move to size word Page 184 LDR r1 RBQP_BUFFER_SIZE reset size of RBQP chunk STR r1 r3 SUB r3 r3 WORD_ SIZE move back one word STR r2 r3 reset ownership of RBQP chunk B ether_receive_done ether_receive_no_data LDR r0 NULL indicate there was no data to transfer Bether_receive_done function is done ether_receive_done restore used registers and return POP r1 r2 r3 r4 r5 r6 r7 LR BX LR data align 10 RBQP bufffer information space used by EMAC receive DMA skip NUM_RBQP_BUFFERS 2 WORD_ SIZE Page 185 align 4 Transfer_Buff buffer where outgoing data is stored prior to transmit Skip TRANSFER_SIZE align 4 RBQP_BUFF buffer where received data is moved skip NUM_RBQP_BUFFERS RBQP_ALLOC end Page 186 PCO OCOEO ECO CEECOLOL OEE ECECEE OC LOOL EEE ECEEEELLEECECECEEEO CO OCECO ECE OCEEC ECOL OLOL OEE ECE ECE LLOEELECEEEEEECLEEECOE Genfuncs A file containing functions that are meant to be used by multiple other files Table of Cont
170. registers and return BX LR DispStringArray array of all possible statuses that can be displayed on VOIP system Statuses are in order of their corresponding value i e Idle has a value of 0 Off hook has a value of 1 etc asciz Idle asciz Off Hook a asciz Ringing asciz Connecting asciz Connected asciz Set IP Page 161 asciz Set Subnet asciz Set Gateway asciz Memory Save asciz Memory Recall asciz Recalled The Data Segment data Last_Status value of the status that was last displayed word end Page 162 ether inc Constants used by functions that run the system s ethernet Revision History 2012 3 3 Josh Fromm Initial Revision equ equ equ equ equ equ equ equ equ equ equ equ PBUF_POOL 0x3 value used to indicate a PBUF_POOI setting PBUF_RAW 0x3 value used to indicate a PBUF_RAW setting RBQP_BUFFER_SIZE OxSEE maximum size of an RBQP buffer RBQP_ALLOC 0x600 space given for an RBQP buffer NUM_RBQP_BUFFERS 0x5 number of RBQP buffers used TRANSFER_SIZE OxSEE maximum number of bytes that can be transferred equ MAC_ADDR_L 0x87654321 lower word of MAC address equ MAC_ADDR_H O0xEA09 higher word of MAC address WRAP _BIT 0x2 bit corresponding to wrap bit in RBQP PMC_PCER_ETHER 0x100000C PCER value to write for ethernet ETHER_PINS OxFFFFFFEO PIOA B pins not us
171. ress is available FALSE if not Local Variables rO value of keypressed r1 address of keypressed Shared Variables keypressed Global Variables None Input None Output None Error Handling None Registers Changed r0 Stack Depth 1 Algorithms None Data Structures None Known Bugs None Limitations None Page 207 Revision Hisotry 2 5 2012 Josh Fromm Outline Created 3 29 2012 Josh Fromm Comments updated global key_available key_available PUSH r1 save used register LDR r1 keypressed LDR _r0 r1 load keypress value in to return register POP r1 restore used register BX LR return getkey Description getkey returns the value of the most recent key press if the key code of the most recent key press is invalid getkey blocks until a valid key code is available Operation getkey loads the value stored in keyvalue and checks if the keypad is in its shifted state If the keypad is shifted getkey adds the shift value onto the key code to yield the Page 208 shifted key code of the pressed key If the keypad is not shifted getkey simply returns the value of keyvalue Before returning a value getkey checks if the value in rO is invalid if it is getkey loops back to the beginning of the function and attempts to get a valid key code Arguments None Return Values rO key
172. return with the passed error code return err receive_data Page 448 Description This function handles receiving data over a TCP connection Operation If there is currently no call in progress the connection is accepted and a ringing packet is sent If there is a call in progress the connection is accepted and the busy packet is sent Arguments arg void not used conn struct tcp_pcb protocol control block for the connection packet struct pbuf pointer to the packet holding the data received err err_t error code for the connection Return Value err_t error status always the passed error code Input None Output None Error Handling If the packet type is unknown the process_error function is called with the error NETERR_UNKNOWN_PACKET Algorithms None Page 449 Data Structures None Shared Variables cur_status changed possibly updated based on actual packets received have_rx_data changed set to TRUE if it is a data packet rx_data changed filled with packet data if it is a data packet Author Glen George Last Modified March 10 2011 of static err_t receive_data void arg struct tcp_pcb conn struct pbuf packet err_t err variables int i general loop index figure out what kind of packet this was switch char packet gt payload 0 Page 450 case A answer packet the other side
173. rom the CPU Clock Logic Clock logic is used to allow a stable phase locked loop running at 150 megahertz The clock logic interacts with the oscillator controller of the CPU JTAG The JTAG block allows debuggers to interface with the CPU Reset Logic Reset logic is used to allow the user to reset the system by holding down the reset switch Page 15 Hardware Manual This section addresses each of the blocks noted in the previous section with gratuitous detail The system s memory map which shows which chip selects are used to control peripherals can be seen in the following image Note that highlighted mappings are those that the VOIP system directly works with ARM Memory Mapping EE52 Josh Fromm Internal Memory Mapping Boot Memory 1MB ROM 1MB SRAM 1MB Address Memory Space oDe USB Host User Interface 1MB Intemal Memories 248 MB Undefined 256 MB User Peripheral Mapping OUEFE FEE aeon 0D System Peripheral Mapping VEFFE EFF 0 posit man 512B 512B Undefined 1518 MB 512B 512B 512B EFFE FFE 256 B woo Internal Peripherals OFEEFEE 256 B 256 B 256 B System Memory Mapping The next image shows the layout of the board with exact model numbers for each component Page 16 ARM Board Layout EES2Z Josh Fromm 8300mil Tm008S 121610 Slon Geer ae Page 17 C
174. rs LDR r0 PMC_PCER enable sscO clock and piob clock LDR r1 PMC_PCER_AUDIO STR r1 r0 LDR rO PIOB_PDR_ disable the pins needed by SSCO LDR r1 SSCO_PINS STR r1 r0 LDR rO PIOB_ASR shift control of those pins to peripheral A STR r1 r0 LDR r0 SSCO_CMR set up clock mode register LDR r1 SSCO_CMR_VAL STR r1 r0 Page 81 LDR rO SSCO_RCMR set up receive clock mode register LDR r1 SSCO_RCMR_VAL STR r1 r0 LDR rO SSCO_RFMR set up receive frame mode register LDR r1 SSCO_RFMR_VAL STR r1 r0 LDR rO SSCO_TCMR set up transmit clock mode register LDR r1 SSCO_TCMR_VAL STR r1 r0 LDR rO SSCO_TFMR set up transmit frame mode register LDR r1 SSCO_TFMR_VAL STR r1 r0 LDR rO AIC_SMR14 set priority for sscO interrupts LDR r1 AIC_SMR14_VAL STR r1 r0 LDR rO AIC_SVR14 cause sscO interrupts to jump to CodecHandler LDR r1 CodecHandler STR r1 r0 Page 82 LDR rO AIC_IECR set up sscO interrupts to trigger AIC interrputs LDR r1 AIC_IECR14_VAL STR r1 r0 LDR rO SSCO_CR enable data to be transmitted and received over sscO LDR r1 SSCO_CR_VAL STR r1 r0 perform a codec reset LDR rO PIOC_PER enable the reset pin LDR r1 PIN_25 STR r1 r0 LDR rO PIOC_OER allow reset pin to output STR r1 r0 LDR rO PIOC_CODR force reset pin low to indicate hardware reset STR r1 r0 now wait for a while to make sure the rese
175. s 3G GG ae Ge i Ge END Page 44 0 gt 0 gt 0 gt 0 gt 0 gt 0 gt 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt 1 gt iji 1 gt 1 gt 1 gt 0 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 0 0 1 1 1 0 1 1 0 0 1 1 0 1 0 1 0 1 1 1 0 0 0 1 0 0 0 1 0 0 0 move to write state 3 move to write state 4 move to write state 5 move to write state 6 move to write state 7 move to write state 8 return to idle state confirm idle state move to state 1 move to state 2 move to read state 3 move to read state 4 move to read state 5 move to read state 6 move to read state 7 move to read state 8 return to idle state confirm idle state Ethernet This subsection will address the Ethernet chip and jack used by the VOIP system The system uses a National Semiconductor DP83848C PHYTER chip to interact with a MagJack SI 50170 F Ethernet Jack The PHYTER chip then communicates with the CPU over the CPU s EMAC controller The schematic for the PHYTER chip and jack titled ARM Ethernet can be found on page 6 of the included schematics Because the EMAC controller is designed specifically to interact with an Ethernet chip there is no specific timing needed The main clock of the Ethernet chip signal MDC is set to be the master cl
176. s different BGE display_addr_hex if remainder is greater than 10 go to special protocol otherwise proceed normally Page 153 LDR rO DISPLAY_WRITE output quotient of division ADD r1 r1 ASCII_ZERO convert value to ascii BL DispBusyCheck block until display is ready STRB r1 r0 output value B display_addr_power_update display_addr_hex LDR rO DISPLAY_WRITE load register that must be written to for output SUB r1 r1 OxA subtract by 10 to find ascii offset from A ADD r1 r1 ASCII_A find ascii value of address character STRB r1 r0 output address B display_addr_power_update now go on to update power of 16 display_addr_power_update MOV r0 r2 set numerator to be current power of 16 LDR r1 Ox10 set denominator to be 16 BL Divide divide to find new power of 16 CMP r1 0x0 if division returned zero then we are done with the function BEQ display_addr_Done MOV r2 r1 otherwise store that value and repeat B display_addr_Main Page 154 display_addr_Done all characters have been displayed pop registers and B return LDR rO Last_Status reset last status LDR r1 0xFF STR r1 r0 POP r0 r1 r2 r3 LR BX LR display_status status_value Description display_status takes a value between 0 and 10 and outputs a corresponding status The list of statuses is fixed and can be seen in DispStringArray Operation To help
177. s sizeof int amp amp key keys i i Page 386 return the appropriate key type return keycodes i Page 387 EERE KEEA EREEREER RE REL ERA LET EE KE EEEE Le Te Te REEE EEE ae eT eee ee ee TE REE j j j j j MEMPROC Memory Processing Functions VolP Telephone Project EE CS 52 JERE EEEE KE EEE KEE KE EREK E E E KAE EE E E E E E E RORE EE EEEE EE E EER EEE KEE EKE EEEE RES EE EEK E This file contains the key processing and general functions for memory operations for the VoIP Telephone Project These functions are called by the main loop of the system The functions included are add_membDigit add a digit to the memory location number clear_memLoc clear the memory location number del_memDigit delete a digit from the memory location number init_memory initialize the memory system recall mem recall the IP address from the current memory location save_mem_ save the current IP address to current memory location start_memLoc start entering a memory location number The local functions included are none Page 388 The global variable definitions included are memloc current memory location saved_IPs array of saved IP memory addresses old_status status of system before a save or recall operation Revision History 6 3 06 Glen George 6 7 06 Glen George library include files none local include files include
178. s ERR_OK Input None Output None Error Handling If there is an error closing the connection the process error function is called with the error NETERR_CLOSE Page 453 Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 10 2011 static err_t busy_sent void arg struct tcp_pcb conn u16_t len variables none the busy packet has been sent close the connection if tcp_close conn ERR_OK error closing the connection report it process_error NETERR_CLOSE nothing else to do return with no error return ERR_OK Page 454 generic_sent Description This function handles the busy packet being successfully sent for states other than busy Operation Used only to help LWIP run smoothly returns immediately Arguments arg void not used conn struct tcp_pcb protocol control block for the connection over which the busy packet was sent len u16_t number of bytes sent ignored Return Value None Input None Output None Error Handling None Page 455 Algorithms None Data Structures None Shared Variables None Author Josh Fromm Last Modified March 16 2012 static err_t generic_sent void arg struct tcp_pcb conn u16_t len variables none return nothing return ERR_OK error_handler Page 45
179. s digits input start_IPEntry Description This function handles the start of entering an IP address It first calls a function to clear the IP address then sets the new system status based on the passed key value and returns that status Arguments cur_status enum status the current system status key_value int value of the input key Return Value enum status the new status Input None Output None Error Handling If there is an unexpected passed key value the error handler is called with the error UNKNOWN_KEYCODE_INIT Page 331 Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified June 6 2006 enum status start_IPEntry enum status cur_status int key_value variables enum status new_status new status to return clear the IP address clr_IP_address figure out the new system status switch key_value Page 332 case KEYCODE_OFFHOOK Off Hook key was seen new status is off hook new_status STAT_OFFHOOK break case KEYCODE _SETIP lt Set IP gt key was seen new status is setting IP address new_status STAT_SETIP break case KEYCODE_SETSUBNET lt Set Subnet gt key was seen new status is setting subnet mask new_status STAT_SETSUBNET break case KEYCODE_SET_GW lt Set Gateway gt key was seen new status is setting gat
180. s keypressed to TRUE to indicate a key is available for handling If the value read from keypad data indicates the shift key has been pressed KeypadPressHandler sets the shared variable shiftkey to TRUE to indicate future key presses should have the number of keys on the keypad added to their key code to yield the key codes of the shifted keypad Arguments None Return Values None Local Variables rO contains addresses and values r1 contains addresses and values Shared Variables keypressed shiftkey keyvalue Global Variables None Input Keypad presses Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures None Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Outline Created Page 203 3 29 2012 Josh Fromm Comments updated KeypadPressHandler SUB LR LR 4 first correct systems pipeline STMED SPI LR PUSH r0 r1 save all used registers LDR ri1 PIOC_PDSR load current value of pio data pins LDR rO r1 LDR ri KeyRDY determine if current interrupt is due to key press or key release AND rO r1 rO CMP rO KeyRDY if keypress is invalid then keep looping until a valid key code is read BNE KeypadPressHandlerDone keycode _get LDR r1 PIOC_PDSR load current value of pio data pins LDR rO r1 LDR r1 KeyDatAll mask all b
181. s to connect to check if there is already a connection if call_ pcb NULL no connection yet try to start one create the protocol control block for the outgoing connection outgoing tcp_new no argument in callbacks tcp_arg outgoing NULL need a callback for the error handler Page 426 tcp_err outgoing error_handler setup the IP address structure ipaddr addr htonl ip attempt to connect to the remote phone if tcp_connect outgoing amp ipaddr CALL_LISTEN_PORT handle_connection ERR_OK error setting up the connection report it process error NETERR_NOCONNECT else already have a connection that s an error process_error MULTIPLE_CONNECTIONS done setting up the connection return return Page 427 tcp_connection_answer Description This function answers an incoming call whose connection was already established Operation An answer packet is sent over the connection and the connection is setup to receive data Arguments None Return Value None Input None Output None Error Handling If there is an error sending the packet the process error function is called with the error NETERR_SEND Algorithms None Data Structures None Shared Variables call_pcb accessed used to send the answer packet Page 428 cur_status changed updated to reflect the new conne
182. setting up the listener the process error function is called with either a NETERR_NOLISTEN or a NETERR_NOBIND error code depending on the exact error Algorithms None Data Structures None Shared Variables call_pcb changed set to NULL cur_status changed set to CALL_NO_CONNECTION have_rx_data changed set to FALSE listener changed initialized Author Glen George Last Modified March 10 2011 ny Page 421 void tcp_connection_restart variables struct tcp_pcb new_listener new listener on a port check if there is a call in progress if call_ pcb NULL have a call in progress need to close it tcp_abort call_pcb check if currently listening if listener NULL are listening need to close the port tcp_abort listener now there is no connection cur_status CALL_NO_CONNECTION call_pcb NULL and no data available Page 422 have_rx_data FALSE create a protocol control block for listening for an incoming connection listener tcp_new setup to listen on port CALL_LISTEN_PORT using the set IP address if tcp_bind listener IP_ADDR_ANY CALL_LISTEN_PORT ERR_OK bound the port now listen for a connection new_listener tcp_listen listener if have a listener update the pointer old pointer is bad now if new_listener NULL have a listener set it up list
183. smite buffer is needed or not word rxneedbuf whether a new receive buffer is needed or not word end Page 131 PO OOO ECO CEEOL OOO ECO ECECECE ECL OLOL EEE ECEEE ELL EEE ECEEEO CO OCEOC ECE ECEEC OL OLOL OEE ECE EEL LEE EEE EEECELEEECE crt0 s Initialization file for EE52 ARM VoIP phone project It sets up the IRQ vector table initializes the stacks for both the IRQ and System modes sets up the Master Clock all of the chip selects for external memories and will eventually call all of the intialization functions for each hardware block Revision History 2008 02 02 Joseph Schmitz Modified code from Arthur Chang to make it available to the students 2011 01 27 Joseph Schmitz Split from crt0 s to boot s 2011 01 31 Joseph Schmitz Removed unused comments 2012 03 29 Josh Fromm Added code to initialize VOIP system CO OCOEO ECO CEOCOC LOLOL O EOC ECECECOLLEL EEE ECEEEEOLLEECECECEEEO CO COCO ECE CEEOL LOL OE ECE ECE EEL LEE EEE EEEEEEEECE Page 132 include at91rm9200 inc include armvoip inc text arm global low_level_init low_level_init global start _ Start Stack and IRQ Initialization CEC COCO EOE OEE EC OME ECE OE ECEOE ECE EEE CEOE EEE E EEEEE ooo LDR rO TOP_STACK MSR cpsr_c ARM_MODEL_IRQ _BIT F_BIT MOV sp rO SUB rO rO IRQ_STACK_SIZE MSR cpsr_c ARM_MOD
184. st determine if the passed pbuf struct contains too much data Page 173 ADD rO rO 0x8 LDR r3 r0 LDR r8 OxFFFF AND r3 r3 r8 get value of sum of all payloads this value will be saved for later use LDR r2 TRANSFER_SIZE CMP 3 r2 BGT ether_transmit_error if theres too much data indicate an error MOV rO r1 BLE ether_transmit_main otherwise continue normally ether_transmit_main LDR r2 r0 set r2 to be the pointer to the next pbuf packet ADD rO rO WORD_SIZE increment to next word in pbuf structure LDR r6 r0 set r6 to by payload address ADD rO rO WORD_SIZE LDR r7 r0 set r7 to be size of current payload LSR r7 BITSPHW dont care about cumulative size of payloads only interested in size of current payload BL copy copy specified number of bytes to the transmit buffer ADD r5 r5 r7 increment receive buffer to point to the start of where the next payload will be dumped Page 174 CMP r2 NULL if next pointer is null all data has been transferred BEQ transmit_blocking if this is the case then we move to sending out the data MOV rO r2 otherwise set the current pbuf pointer to next B ether_transmit_main then loop back and repeat transmit_blocking LDR rO EMAC_TSR check status of transmit LDR r1 r0 load transmit status value AND ri r1 IDLE_BIT isolate idle bit CMP r1 IDLE_BIT check if that bit is set BNE transmit_blocking if not keep looping
185. stabilize the display display status only outputs to the display if the passed status isn t currently being displayed this is done by checking the value stored in Last_Status If that value is the same as the passed value display_status returns Otherwise display status takes the base address of DispStringArray and adds on the passed value times 16 to find the start address of the correct status display_status then iterates through the ascii characters Page 155 and displays them until a null is encountered Arguments Value of status to display Return Values None Local Variables rO contains addresses and control words r1 contains addresses and control words r2 contains addresses and control words r3 contains addresses and control words Shared Variables Last_Status Global Variables None Input None Output Displays a status on the top row of the display module Error Handling None Registers Changed None Stack Depth 5 Algorithms None Data Structures DispStringArray Known Bugs None Page 156 Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision 2 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated global display_status display_ status PUSH r0 r1 r2 r3 LR save used registers MOV r2 rO save input LDR rO Last_ Status then determi
186. stablish a call have_rx_data changed set to FALSE Author Glen George Last Modified March 10 2011 static err_t handle_connection void arg struct tcp_pcb conn err_t err variables none Page 443 have a connection this is the calling protocol control block call_ pcb conn setup the callbacks no argument in callbacks tcp_arg conn NULL need a callback for the error handler tcp_err conn error_handler and setup the data processing callback tcp_recv conn receive_data the status is now that we are trying to establish a call cur_status CALL_CONNECTING no data yet have_rx_data FALSE return the passed error code return err Page 444 accept_connection Description Operation Arguments Return Value This function handles accepting a connection If there is currently no call in progress the connection is accepted and a ringing packet is sent If there is a call in progress the connection is accepted and the busy packet is sent arg void not used conn struct tcp_pcb protocol control block for the connection err err_t error code for the connection err_t error status always the passed error code Input None Output Page 445 None Error Handling If there is an error sending the busy or ringing packet the process_error function is called wi
187. status if cur_status prev_status status has changed update the status display display_status xlat_stat cur_status always remember the current status for next loop iteration prev_status cur_status see if we need to generate a TCP timer event timeout elapsed_time only worry about generating timer event if using LwIP ifndef NO_LWIP if timeout gt TCP_TIMEOUT have a timeout tell the TCP code tcp_tmr have taken care of a timeout interval now timeout TCP_TIMEOUT endif Page 378 check if need to process a packet if ether_rx_available there is ethernet data available try to process it only process it if using IwIP code ifndef NO_LWIP ethernetif_input endif done with main never should get here return O return O key_lookup Page 379 Description This function gets a key from the keypad and translates the raw keycode to an enumerated keycode for the main loop The keycode precedence is a function of the passed argument If the argument is true numeric keys have precedence This allows the numeric keys to have more than one meaning Operation The function calls getkey and then converts the returned raw keycode to an enumerated keycode for the main loop by using one of two translation tables Which table to use is determined by the passed argument Arguments numeric
188. t 1 3 shift it down to an 8 bit value current_byte gt gt 8 3 IP_digit_cnt 1 3 remove the last digit just divide by 10 current_byte 10 compute the new IP address value mask off old bits for the current byte IP_address amp OxFFOOOOOOL gt gt 8 IP_digit_cnt 1 3 bring in the new value for the byte IP_address current_byte lt lt 8 3 IP_digit_cnt 1 3 update the digit count there s one less digit now IP_digit_cnt Page 343 update the calling IP address set_calling_IP IP_address display the new IP address display_IP IP_address else no digits to delete call the error handler process_error IP_ADDRESS_UNDERFLOW all done deleting the digit return the passed status return cur_status set_IP Page 344 Description This function handles setting the IP address to the address entered thus far The status is always returned as idle Operation The TCP IP stack functions are setup with the current value of the IP address and then the connection is restarted Arguments cur_status enum status the current system status ignored key_value int value of the key that was input ignored Return Value enum status the new status always STAT_IDLE Input None Output None Error Handling If there is an error getting the named i
189. t Modified June 3 2006 ny Page 254 unsigned long int get_calling IP variables none just return the value of calling _IP return calling_IP get_calling name Description This function returns the name of the other end of the call Operation The value of the shared variable calling name is returned Page 255 Arguments None Return Value const char the name of the other end of the call either who is calling or who was called Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables calling name accessed value to return Author Glen George Last Modified March 8 2011 const char get_calling_name variables none Page 256 just return a pointer to calling name return calling name set_calling_IP Description This function sets the IP address of the other end of the call Operation The shared variable calling IP is set to the passed value Arguments ip unsigned long int the new value of the IP address of the other end of the call either who is calling or who was called Page 257 Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables calling_IP changed changed to passed value Author Glen George Last Modified June 3 2
190. t works LDR r1 WAIT_TIME set up counter for wait loop Page 83 LDR r 0x0 when counter is zero wait loop can end ssc0_init_loop ADD rO rO 0x1 increment counter by 1 CMP rO r1 if counter is zero wait loop is over BNE sscO_init_loop otherwise keep waiting LDR rO PIOC_SODR_ set reset pin back to end reset LDR r1 PIN_25 STR r1 r0 POP r0 r1 restore registers and return BX LR call_start rx_buffer_addr Description call_start initializes the shared variables used by audio functions and also starts sscO interrupts so that audio can be input and output Operation Sets shared variables to their in initial value and writes to the SSCO interrupt enable register to trigger interrupts on frame sync signals Page 84 Arguments rO address of first receive buffer Return Values None Local Variables rO contains addresses and control words r1 contains addresses and control words Shared Variables rxbuff1 txaudiocount rxaudiocount txneedbuf rxneedbuf Global Variables None Input None Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures rxbuff1 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created Page 85 3 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fro
191. ter to determine if enough time has passed for the display to accept another command The function will hold until the display is ready Operation DispBusyCheck reads from the display modules status register and checks the status of the bit indicating whether the display is ready for another command If the display is ready the function returns if the display is not ready the function loops back and repeats the checking process Arguments None Return Values None Page 159 Local Variables rO contains addresses and control words r1 contains addresses and control words Shared Variables None Global Variables None Input Status vale from display module Output None Error Handling None Registers Changed None Stack Depth 2 Algorithms None Data Structures DispStringArray Known Bugs None Limitations None Revision Hisotry 2 5 2012 Josh Fromm Initial Revision 2 7 2012 Josh Fromm Updated to function better 3 29 2012 Josh Fromm Comments updated DispBusyCheck Page 160 DispBusyCheck PUSH rO r1 save used registers DispBusyLoop LDR r1 DISP_CS_ load the value stored in the status register of display LDRB rO r1 AND rO rO DISPLAY_RDY_BIT extract the status bit CMP rO DISPLAY_RDY check if display is ready BNE DispBusyLoop if not repeat loop POP r0 r1 otherwise restore
192. th the error NETERR_SEND Algorithms None Data Structures None Shared Variables call_pcb changed checked if NULL and set to the incoming connection if so cur_status changed changed to CALL_CONNECTING if are trying to establish a connection Author Glen George Last Modified March 10 2011 af static err_t accept_connection void arg struct tcp_pcb conn err_t err variables none accept the incoming connection Page 446 tcp_accepted conn no argument in callbacks tcp_arg conn NULL need a callback for the error handler tcp_err conn error_handler is there already a call in progress if call_pcb NULL no call in progress remember the incoming connection call_pcb conn set the calling IP number set_calling_IP ntohl conn gt remote_ip addr tcp_sent conn generic_sent send a ringing packet if tcp_write conn R 1 1 ERR_OK error sending the packet report it process _error NETERR_SEND and the status is now that we are trying to connect cur_status CALL_CONNECTING Page 447 else already have a call in progress send back a busy signal need callback for data sent tcp_sent conn busy_sent send the busy packet if tcp_write conn B 1 1 ERR_OK error sending the packet report it process_error NETERR_SEND nothing else to do
193. tial revision 6 8 06 Glen George Added error value UNKNOWN_ETHER_NAME 3 10 11 Glen George Added a number of error values related to TCP communication Page 301 ifndef __ERROR_H__ define _ ERROR H__ library include files none local include files none constants none structures unions and typedefs error types Page 302 enum error_type UNKNOWN_KEYCODE_INIT unknown keycode in memory or IP initialization IP_ADDRESS_OVERFLOW overflow in entered IP address IP_ADDRESS_UNDERFLOW underflow in entered IP address MEMORY_ADDRESS_OVERFLOW overflow in entered memory location MEMORY_ADDRESS_UNDERFLOW underflow in entered memory location BAD_MEMORY_ADDRESS bad memory address on save recall UNKNOWN_ETHER_NAME unknown ethernet interface name UNKNOWN_TCP_STATUS unknown TCP status returned MULTIPLE_CONNECTIONS multiple connections attempted NETERR_NOLISTEN can t setup listener NETERR_NOBIND can t bind the port NETERR_SEND error sending a packet NETERR_CLOSE error closing a connection NETERR_NOCONNECT error setting up a connection NETERR_UNKNOWN_PACKET unknown packet type received NETERR_GENERAL general networking error function declarations Page 303 void process _error enum error_type process an error endif Page 304
194. tion CodecHandler processes an SSCO receive first then transmits data however input and output function essentially the same way CodecHandler first checks whether the receive or transmit buffer is full or empty respectively If so Page 116 CodecHandler switches the active buffer to the back up buffer and indicates a new buffer is needed If there is no active buffer received data is dropped or a 0 is transmitted If data does not need to be dropped CodecHandler inputs and outputs data normally and increments counters indicating how how many bytes in the current buffer have been input or output Arguments None O O O Q Return Values None Local Variables rO varies by process often used as address storage r1 varies by process often used as control word or data r2 values loaded from addresses Shared Variables rxaudiocount txaudiocount rxneedbuf txneedbuf txbuff1 txbuff2 rxbuff1 rxbuff2 Global Variables None Input Audio data from codec moved to buffer Output Outputs audio data from buffer to codec Error Handling None Registers Changed None Stack Depth 2 Page 117 Algorithms None Data Structures buffers located at rxbuff1 rxbuff2 txbuff1 txbuff2 Known Bugs None Limitations None Revision Hisotry 2 28 2012 Josh Fromm Outline Created 3 7 2012 Josh Fromm Updated to function better 3 2
195. tion is done Handle_Tx first output next halfword in buffer LDR rO txbuff1 load base address of current buffer LDR r2 r0 address of buffer loaded LDR rO txaudiocount determine which halfword in the buffer should be output LDR r1 r0 Page 122 ADD r2 r2 r1 base address of buffer shifted by the number of bytes already read from tx buffer LDRH 10 r2 load the next halfword to output LSL rO VOLUME_CON_BITS set volume control ADD rO rO VOLUME_CON_VAL LDR r1 SSCO_THR STRH roO r1 output next half word in buffer LDR rO txaudiocount update number of bytes read from buffer LDR r1 r0 ADD r1 r1 0x2 STR r1 r0 function is now done CodecHandlerDone LDR rO SSCO_SR read sscO status register to reset it LDR r1 r0 LDR rO AIC_EOICR signal end of interrupt LDR r1 TRUE Page 123 STR r1 r0 POP r0 r1 r2 restore registers and return LDMFD SP PC update_tx new_buffer_addr Description update_tx checks whether a new buffer of outgoing audio data is needed A buffer is needed when one or both of the stored buffers has been emptied of audio data If this is the case the function accepts the passed buffer address and returns true If no buffer is needed the function returns false Operation update_tx simply checks the statuses of shared variables to determine whether a new buffer is needed then updates shared variables to in
196. tions of the software interacts with each other and the hardware For more detailed explanations of how software works see the software section at the end of this manual It should be noted that the system uses code developed by the Swedish Institue of Computer Science for a majority of ethernet interaction The code is called IwIP IwIP is only briefly covered in this software manual Page 54 Major Code Blocks with Hardware Page 55 Explanation of File Purposes e Boot s Boot s is the code stored on the system s EEPROM When the system restarts either through power up or the reset switch boot s is executed Boot s sets up the chip selects for ROM and SRAM sets up the main clock 20 megahertz instead of the default slow clock 32 kilohertz and copies the contents of the ROM onto SRAM e Crt0 s Crt0 s is the system s next layer of initialization code Crt0 s is run after boot s moves the system s entire body of code to SRAM Crt0 s sets up all chip selects establishes the master clock of the system to be 75 megahertz calls the initialization functions of the display keypad and audio code located in display s keypad s and audio s respectively When finished crtO s branches to the code s main loop e Mainloop c Mainloop c runs the system after initialization The main loop interacts directly with all peripheral files of the system Mainloop c checks if keypad presses are available and handles key codes t
197. to initialize it first save the magic value saved_IPs 0 MAGIC_IP now set all other IPs to O for i 1 i lt MEMORY_SIZE i saved_I Ps i 0 done with memory initialization return return start_memLoc Page 392 Description This function handles the start of entering a memory location number It first clears the current memory location then sets the new system status based on the passed key value and returns that status Arguments cur_status enum status the current system status key_value int value of the input key Return Value enum status the new status Input None Output None Error Handling If there is an unexpected passed key value the error handler is called with the error UNKNOWN_KEYCODE_INIT Algorithms None Data Structures None Shared Variables memloc changed set to 0 Author Glen George Last Modified June 7 2006 Page 393 enum status start_memLoc enum status cur_status int key_value variables none clear the memory location memloc 0 and display it display_memory_addr memloc save the current status so can go back to it after saving restoring old_status cur_status figure out the new system status switch key_value case KEYCODE_MEMSAVE lt Memory Save gt key was seen Page 394 new status is saving an IP to memory
198. trol register equ NCS1CON 0x00003085 Value to write to chip select one control register equ NCS2CON 0x000340AA Value to write to chip select two control register equ NCS3CON 0x74034098 Value to write to chip select three control registers General Constants equ LOW_BYTE_MASK OxFF constant used to mask all bits except low byte equ LOW_BIT_MASK 0x1 constant used to mask all bits except low bit equ TRUE OxFF constant used to indicate true equ FALSE 0x0 constant used to indicate false equ NULL 0x00 ASCII value for NULL equ SRAM_ SIZE 0x20000 memory space in SRAM equ ROM_START 0x10000000 first address of ROM Page 64 equ SRAM_START 0x20000000 first address of SRAM equ DRAM_START 0x40000000 first address of DRAM equ WAIT_TIME 0x1000 number of cycles for a wait loop equ PA4 VAL 0x10 value to write to a control register that corresponds to peripheral 4 equ PMC_SCER_PA4 0x201 value to write to PMC SCER to enable PCK1 equ PMC_PCER_PIOA 0x4 value to write to PMC_PCER to enable PIOA clocks equ PMC_PCER_AUDIO 0x4008 value used to provide clocks to peripherals used in audio functions equPCK1 VAL OxE value to write to set programmable clock 1 to be 1 4th of the master clock Page 65 PO COCO ECO CECE LOL OEE ECECEE OL OLOL OEE ECEEE ELLE ECECECEEEO CO CEO ECE CEE ECL LOO EEC ECE EEL LEE ECECEEEEEOE at91rm9200 inc General control register address de
199. ue of the key that was input ignored Return Value enum status the new status always STAT_IDLE Input None Output None Error Handling If there is an error getting the named interface given by ETHER_INTF the error handler is called with the error UNKNOWN_ETHER_NAME Algorithms None Data Structures None Page 348 Shared Variables None Author Glen George Last Modified March 10 2011 enum status set_gateway enum status cur_status int key_value variables ifndef NO_LWIP empty function if there is no LWIP code struct netif net_intf network interface to access struct ip_addr gw the new gateway address create the gateway address in network order gw addr htonl get_calling_IP now get the network interface for our device net_intf netif_find ETHER_INTF check if got an interface Page 349 if net_intf NULL got the interface set the gateway address netif_set_gw net_intf amp gw else no interface report the error process error UNKNOWN_ETHER_NAME endif need to restart the connection tcp_connection_restart done so return with idle as the status return STAT_IDLE set_subnet Page 350 Description This function handles setting the subnet mask to the address entered thus far The status is always returned as idle Operation The function calls the TCP
200. until it is LDR r0 TRUE once transmit is done indicate success BEQ transmit_ether_data function can now output transmit_ether_data LDR rO EMAC_TAR LDR r1 Transfer_Buff STR r1 r0 Page 175 LDR rO EMAC_TCR_ set length to be transmitted to total length of all pbuf payloads STR r3 r0 B ether_transmit_done now function is finished ether_transmit_error LDR rO FALSE indicate an error ocurred Bether_transmit_done function can return ether_transmit_done restore used registers and return POP r1 r2 r3 r4 r5 r6 r7 r8 LR restore used registers and return BX LR ether_rx_available Description ether_rx_available returns the current status of ether_rx_flag If a buffer is available the function calls ether_ISR to determine which buffer should be serviced next by ether_receive Arguments None Page 176 Return Values rO TRUE if theres a filled receive buffer FALSE otherwise r3 address of filled RBQP chunk Local Variables rO variable storage r1 various things r2 addresses r3 counter r4 value storage Shared Variables ether_rx_flag Global Variables None Input None Output None Error Handling None Registers Changed rO r3 Stack Depth 0 Algorithms None Data Structures RBQP Known Bugs None Limitations None Page 177 Revision Hisotry
201. up the interface host name if LWIP_NETIF_HOSTNAME etx gt hostname lwip endif Page 312 no state etx gt state NULL set the interface name etx gt name 0 e etx gt name 1 t use etharp_output to do output saves a function call etx gt output etharp_output etx gt linkoutput ethernetif_output set MAC hardware address length etx gt hwaddr_len ETHARP_HWADDR LEN and set MAC hardware address itself etx gt hwaddr 0 MAC_ADDR_L amp OxFF etx gt hwaddr 1 MAC_ADDR_L gt gt 8 amp OxFF etx gt hwaddr 2 MAC_ADDR_L gt gt 16 amp OxFF etx gt hwaddr 3 MAC_ADDR_L gt gt 24 amp OxFF etx gt hwaddr 4 MAC_ADDR_H amp OXxFF etx gt hwaddr 5 MAC_ADDR_H gt gt 8 amp OxFF Page 313 set the maximum transfer unit etx gt mtu 1500 device capabilities can broadcast can do ARP and there is an active link etx gt flags NETIF_FLAG_ BROADCAST NETIF_FLAG_ETHARP NETIF_FLAG_LINK_UP initialize the hardware err lether_init return whether or not there was an error if err had an error return ERR_IF return ERR_IF else no error return ERR_OK return ERR_OK Page 314 ethernetif_input Description This function gets input from the passed network interface and processes it Only ARP and IP packets are processed For eff
202. urned if the shared variable call_pcb is not NULL and FALSE is returned if it is NULL Arguments None Return Value char TRUE is returned if there is a valid TCP connection and FALSE is returned otherwise Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables call_pcb accessed checked for NULL Page 414 Author Glen George Last Modified March 10 2011 char have_tcp_connection variables none check if the connection is closed check_for_close there is a connection if call_pcb is not NULL return call_pcb NULL Page 415 tcp_connection_status Description This function returns the current status of the TCP connection Operation First the connection is checked to see if it has been closed Then the value of the shared variable cur_status is returned Arguments None Return Value enum tcp_conn_status current status of the TCP connection Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables cur_status accessed value to return Page 416 Author Glen George Last Modified March 10 2011 enum tcp_conn_status tcp_connection_status variables none check if the connection has been closed check_for_close and just return the value of cur_status
203. void networking system initialization endif Page 323 REEREET ERLE EEL LESA RE REL TRALEE TRS KE EEEE CEL SCE TA REEE EEE EEE EE REARS CEE ERE ES INTERFAC H Interface Definitions Include File ia VoIP Telephone Project hi EE CS 52 2 EERE ELEEEEE EA RERE ELE RARERELEALAL EREET EEREE EERTE REESE ERLE EAE ERE RE EEE A This file contains the constants for interfacing between the C code and the assembly code hardware This is a sample interface file to allow test compilation and linking of the code Revision History 6 3 06 Glen George Initial revision 6 7 06 Glen George Added ETHER_INTF definition 3 8 11 Glen George Added MAC_ADDR_H and MAC_ADDR LL definitions Page 324 ifndef __INTERFAC_H__ define _INTERFAC_H__ library include files none local include files none define define define define define define define define DRAM_START 0x40000000 MEMORY_SIZE 32 SAMPLE_RATE 8000 MAC_ADDR_H OxEA09 MAC_ADDR_L 0x87654321 ETHER_INTF etO KEY_O 13 KEY_1 0 Page 325 define define define define define define define define define define define define define define define define define define define define define define define KEY_2 1 KEY_3 2 KEY_4 4 KEY_5 5 KEY_6 6 KEY_7 8 KEY_8 9
204. wip stats h include ipv4 lwip ip h include Iwip err h Page 306 include Iwip tcp h include Iwip raw h local include files include voipdefs h include ethernet h include interfac h locally global variables static struct netif et0 the network interface init_ethernet Description This function takes care of all of the initialization for the ethernet interface It first sets up the IwIP code Then it initializes the ethernet hardware Page 307 Operation The IwIP library is initialized Then the network interface is initialized with default addresses And finally the hardware is setup Arguments None Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables etO the network interface for the system Author Glen George Last Modified June 9 2009 void init_networking Page 308 variables struct ip_addr gateway default gateway struct ip_addr netmask default network mask struct ip_addr default_addr default IP address setup the IwIP library mem_init memp_init pbuf_init netif_init etharp_init stats_init stats_init mem_init memp_init pbuf_init netif_init ip_init etharp_init raw_init Page 309 setup the default gateway net mask and IP a
205. x70 PIO Peripheral A Select PIOC_BSR PIOCBase 0x74 PIO Peripheral B Select PIOC_SODR PIOCBase 0x30 PIO Set Output Data PIOC_ISR PIOCBase 0x4C PIO interrupt status register Advanced Interrupt Ccontroller Definitions equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ equ Page 70 AlCBase AIC_SMR1 AIC_SVR1 AIC_SMR4 AIC_SVR4 AIC_SMR14 AIC_SVR14 AIC_SMR17 AIC_SVR17 AIC_SMR18 AIC_SVR18 AIC_SMR24 AIC_SVR24 AIC_SMR25 AIC_SVR25 AIC_SMR26 AIC_SVR26 AIC_ISR AIC_IMR AIC_IPR OxFFFFFOOO base address AlCBase 0x4 AlCBase 0x84 AlCBase 0x10 AlCBase 0x90 AlCBase 0x38 AlCBase OxB8 AlCBase 0x44 AlCBase OxC4 AlCBase 0x48 AlCBase OxC8 AlCBase 0x60 AlCBase OxE0O AlCBase 0x64 AlCBase OxE4 AlCBase 0x68 AlCBase OxE8 AlCBase 0x108 AlCBase 0x110 AlCBase 0x10C system source mode system source vector PIO C Source Mode PIO C Source Vector SSCO Source Mode 14 SSCO Source Vector 14 TCO Source Mode 17 TCO Source Vector 17 TC1 Source Mode 18 TC1 Source Vector 18 EMAC Source Mode 24 EMAC Source Vector 24 IRQO Source Mode 25 IRQO Source Vector 25 IRQ1 Source Mode 26 IRQ1 Source Vector 26 Interrupt Status Interrupt Mask Interrupt Pending equ AIC_IECR AlCBase 0x120 Interrupt Enable Command equ AIC_IDCR AICBase
206. x_buffer Page 277 all done processing the call for now return return Ve disconnect_call Description This function ends a call Operation The TCP connection is closed and the audio I O is halted Arguments None Return Value None Input None Output None Error Handling None Page 278 Algorithms None Data Structures None Shared Variables None Author Glen George Last Modified March 9 2011 void disconnect_call variables none close the TCP connection tcp_connection_close and halt the call call_halt Page 279 done ending the call return return ring and busy tone generators ring _fill Description This function fills the passed buffer of the passed size with a ring tone A ring tone is a 500 Hz signal modulated by a 20 Hz signal at 13 dBm The tone is on for 2 seconds and off for 4 seconds Operation A static shared variable is used to keep track of the position in the waveform pattern when the function is called The function computes the the waveform pattern and writes it to the buffer Page 280 Arguments p short int pointer to buffer to be filled with data size int size of the passed buffer Return Value None Input None Output None Error Handling None Algorithms None Data Structures None Shared Variables ring_busy_timer ch
207. y AIC_IECR14_VAL 0x4000 value to write to enable sscO interrupts on the AIC General Audio Definitions equ equ equ equ equ Page 77 AUDIO _BUFLEN 0x200 length of buffers in bytes SSCO_PINS OxF bits corresponding to PIOB pins used by SSCO PIN_25 0x2000000 bit corresponding to PIOC25 VOLUME_CON_BITS 0x3 bits taken up by volume control in audio data output to codec VOLUME_CON_VAL 0x3 value ranging between 0 and 7 that determines volume of audio data processed by the systems codec PCO OCOEO ECO CECO LOL OEE ECECECE OL ELOL EEE EEE EE LLEECELECEEE CO OCOECO ECE CECE LLL O EOE EEE ECL OLOL EEE EEE ELEEECE audio s Initialization event handling and basic functions of VOIP audio Table of Contents 1 sscO_init Function called to initialize the registers needed for SSC to __ to function 2 call_start Initializes SSCO interrupts so that audio data can be input and output 3 call_halt Ends SSCO interrupts so that no audio dataisinputor output 4 CodecHandler Called during every frame sync interrupt Inputs and filled or empty audio buffers 5 update_tx Checks whether a new buffer of audio data to transmit is needed outputs a half word of audio data The function also handles swapping of 6 update_rx Checks if a new buffer to store incoming audio data is needed Revision History
208. y global variable definitions included are none Revision History 6 3 06 Glen George Initial revision 6 7 06 Glen George Added initialization of the rx tx buffers Page 366 6 7 06 Glen George Added displaying incoming call IP address 6 7 06 Glen George Improved processing of memory recall 6 9 09 Glen George Added support for LWIP 3 4 11 Glen George Added static to key_lookup declaration to avoid compiler errors warnings 3 8 11 Glen George Changed TCP timer to run at a fixed rate instead of a fixed interval library include files ifndef NO_LWIP don t include files if not using LWIP include Iwip tcp h endif local include files include interfac h include voipdefs h include keyproc h include callutil h include buffers h include tcpconn h Page 367 ifndef NO_LWIP don t include files if not using LWIP include ethernet h endif local function declarations static enum keycode key_lookup int translate key values into keycodes main Description This procedure is the main program loop for the VoIP Telephone Recorder Operation The function loops getting keys from the keypad processing those keys as is appropriate It also handles updating the display and setting up the buffers for audio input and output The loop is table driven Page 368 Arguments None Return Value int return code always 0 never returns

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