F re e s c a le S e m ic o n d u c to r, I n c . ..
Contents
1. Mayeg auusssip siy uj euo pasamod siu Zr aduni joauucosiq Ld 30 9 LL Suid useavjaq aduni PaUUOISIP 9 ZA Ul 10421050 PAUUED ZHN POES 6 e auo o 5 ayp jouyas Aue apop J0JUoJA 403 e3oN zr uo aduni 329uu0 d JO suid ussAjaq AJeduin e j33auuo2 apoy 404 30N ad gN 30010 360 YOLISNNOD 8 107241 ifo Iul XL of ox 950 le es r eo lene A EM 100 2233 10071334 t ITE TOW OF ab aiii 82 S110 2 0 Nv2 0 8 6 indo leuas cECSH 3 3m adu t I any SSA E ib E anra Dh sop ll l 1071950 adu 10 a uoneiauac 32019 10 154 za 1 dfiS ANIOd 1531 Pdl AL Y 03 vido Nn 10 e se joe NIT SU si AO 8I24 J X z Nn iray 3 Suid uaaaaq i ayy er aq uo aduni yoauuoa Agua apo 404 P Ld tow oe ai Sasi egz UseAAjaq uo aduni pauuoo 7 ayp NOY fua apoyy 4 404 an 4eduinf2. extern void LIN ISR SCI Receive ESCI receive ISR extern void LIN ISR SCI Error ESCI error ISR Ff extern void TimerB Timer Module B Overflow ISR extern void TimerB0 Timer Module B Channel 0 ISR extern void BREAK Command SWI ISR endif defined HCO8EY16 RK KIRK KKK KK KKK IK IK KKK Ck kk Ae IR AAAI A IRR Kk KC IIR AA kk kc kk kk ke ke ke NODE STARTUP By default compiler startup routine is called User is able to replace this by any other routine IR RK KAA IR ARR IR IRR Kk dif defined HICROSSOS8 define Node Startup Startup extern void Startup HiCross compiler startup routine declaration dendif defined HICROSSO8 RK RK KKK kk Ck CK Ck kk IR KK Ck kk IA IR KAR Kk CK kk Kk Ck kk A k Kk ck ke kk ke ko ke ke ke ke ke INTERRUPT VECTORS TABLE User is able to add another ISR into this table instead NULL pointer FRR AIR e AE RR AIR ARIK RAIA OK Ck Kk kk IR IIR Kk dif defined NULL define NULL 0 dendif defined NULL undef LIN VECTF dif defined HICROSSOS8 define LIN VECTF void const pragma CONST SEG VECTORS DATA vectors segment declaration void const vectab dendif defined HICROSSO8 if defined HCO8EY16 LIN Sample Application for the MC68HC908EY16 Evaluation Board 19 For More Information On This Product Go to www freescale com Freescale Sem
3. sample ide EYLEDemo LEDemo mcp into Codewarrior window 4 Connected to the Cyclone via its 16 way cable pin1 marked red to the corner of the evaluation board and switch the board on Run the debugger by clicking on either green arrow Error messages relating to the limitations of the Codewarrior license may appear they will not reoccur as long as the rest of this procedure is followed and the debugger is kept open If any compilation or linking is required it will happen before the debugger starts up 5 In Component pull down menu select Set target and then HC08 and P amp E Target Interface Press OK 6 If prompted by a window headed Attempting to contact target and pass security select Target Hardware Type class V and click on contact target with these settings This window may also prompt for any monitor mode security issues 7 Check PEDebug pull down menu for device EY 16 and mode In circuit debug programming and if required change to these settings 8 In PEDebug pull down menu select load and file slave abs in bin directory This will overwrite the code in FLASH with that contained in slave abs select yes when prompted for permission to overwrite FLASH 9 Run program by clicking on green GO arrow 10 Code should now run If the source code has not been changed then the LED LIN monitor described in this application note will now be running and LED DA flash
4. At 9 8304 MHz it is appropriate for monitor mode entry and is also the same frequency as the Cyclone Multilink clock By initially using this frequency to develop the application no software changes are required between software debug and stand alone running of the LIN node If a different target frequency is required then care should be taken when the switch is made The file slave cfg appendix IIc shows the required settings to configure the LIN drivers for a 9600 baud rate using 9 8304MHz and 8 0 MHz oscillator frequencies Interrupts are enabled so that the LIN drivers once initialised by LIN init can function properly The main while loop uses the Time Base Module TBM to facilitate a 244Hz repetition rate based on an 8MHz crystal Once every 4 1ms the TBM overflow flag is set and the main loop is executed The flag is cleared and a counter used to flash an LED D4 at 244 256 Hz to indicate that the board is running correctly LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc Initialize CONFIG ports TBM and LIN drivers Enable interrupts lt gt Y Clear timebase Interrupt Flag Increment tick counter Y Tick LED on Tick LED off it v Check LIN bus status Activity LED on Activity LED off Check mess
5. AN2432 D Appendix 1 Codewarrior LIN project cloning Appendix Codewarrior LIN project cloning The easiest way to generate an MC68HC908EY 16 LIN Codewarrior project is to clone the example application included on the CD This automatically ensures that the compiling linking and building process is configured correctly An appropriate procedure is shown below 1 10 11 In the directory linO8E Y sample make an additional copy of the folder EYLEDemo and give it an appropriate name e g LINnode Delete the LEDemo c source file from the new folder MinO8EY sample LINnode and add the application source file s In the directory linO8EY sample ide make an additional copy of the folder EYLEDemo and give it the same name as that used in step 1 Rename the file inO8EY sample ide LINnode LEDemo mcp to LINnode mcp Launch Codewarrior close any open projects and drag in the file MinO8EY sample ideLINnode LINnode mcp Remove LEDemo c from the project by selecting the file in files folder and deleting it using the Edit pull down menu Add the required source file s to the project by selecting Add Files from the project pull down menu Browse for the file s select and click on Typically the single file inO8EY sample LINnode LINnode c is required If the added file appears in an inappropriate position in the list of project files it can be dragged into the source folder U
6. LIN VECTF LIN_ISR_Timer0O OxFFF6 TIMER A channel 0 endif defined MASTER dif defined SLAVE LIN VECTF NULL OxFFF6 TIMER A channel 0 endif defined SLAVE LIN VECTF NULL OxFFF8 CMIREQ LIN VECTF NULL OxFFFA RQ LIN VECTF BREAK Command OxFFFC SWI xy LIN VECTF NULL OxFFFC SWI LIN VECTF Node Startup xFFFE RESET fendif defined HCO8EY16 dif defined HICROSSOS8 pragma CONST SEG DEFAULT endif defined HICROSS08 endif defined HC08 20 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Appendix lic slave cfg LIN configuration file Appendix llc slave cfg LIN configuration file ifndef LINCFG H define LINCFG H RK RIK KK KK Kk Ck Kk kk IK IK KKK Ck Kk KC IR KAA Kk KC KK kk Kk CK CK kk Kk Ck kk A k kk ko ke kk I ke ke ek E Copyright C 2001 Functions LIN Driver static configuration file for LIN08 Slave sample with Freescale API Notes FRR RR e E RIK A IIR A RIK RR AIR Kk RRR Kk k Kk k kk kk kk ke kk Ck k k ke kk k kk k ke ke ke e e ek if defined HC08 This definition configures the LIN bus baud rate This value shall be set according to target MCU SCI register usage HCO8EY16 the 8 bit value will be masked by 0x37 and put into SCBR register uh Selects 960
7. com LIN Sample Application for the MC68HC908EY16 Evaluation Board For More information On This Product Figure 1 MC68HC908EY16 evaluation board c Freescale Semiconductor Inc AN2432 D Software The LIN LED monitor uses the Freescale Metrowerks LIN drivers to handle the LIN I O protocol Access to the drivers is via the API described the LINO8 Driver User s Manual reference 2 This manual is included on the CD accompanying the evaluation board An example of the use of this API is the function call LIN GetMsg 0x20 Data buf This is all that is required to get the data from the LIN message with an ID of 20 and put it into the array Data buf This use of the LIN drivers results in the very simple application software listed in section 7 In order to respond to a master request command frame ID Ox3C the user code has to include the function LIN Command This is for instance how the master would request all slave nodes to go into their low power standby or sleep mode In this application sleep mode is entered when there is no bus activity and this function is just a dummy while 1 The main software flow chart is shown in figure 2 Once the variables have been declared the CONFIG and I O registers are initialised The CONFIG 1 value of 0x01 disables the COP while the CONFIG2 value of 0x29 configures the MCU to use the crystal oscillator In this configuration the external canned oscillator can also be used
8. evaluation board LED use D4 port D5 port D6 port D7 port D8 port bit bit bit bit bit flashes 8 1Hz to show code is running indicates any LIN bus activity shows presence of ID 30 message shows presence of ID 20 message indicates bit 7 of byte 3 of message 20 PpPPUU RRO RK KKK KK KK CK CK kk Kk Ck Freescale reserves the right to make changes without further notice to any product herein to improve reliability function or design Freescale does not assume any liability arising out of the application or use of any product circuit or software described herein neither does it convey any license under its patent rights nor the rights of others Freescale products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support life or for any other application in which the failure of the Freescale product could create a situation where personal injury or death may occur Should Buyer purchase or use Freescale products for any such unintended or unauthorized application Buyer shall indemnify and hold Freescale and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indi
9. message ID file This page is intentionally left blank LIN Sample Application for the MC68HC908EY16 Evaluation Board 23 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc How to Reach Us Home Page www freescale com E mail support freescale com USA Europe or Locations Not Listed Freescale Semiconductor Technical Information Center CH370 1300 N Alma School Road Chandler Arizona 85224 1 800 521 6274 or 1 480 768 2130 support freescale com Europe Middle East and Africa Freescale Halbleiter Deutschland GmbH Technical Information Center Schatzbogen 7 81829 Muenchen Germany 44 1296 380 456 English 46 8 52200080 English 49 89 92103 559 German 33 1 69 35 48 48 French support freescale com Japan Freescale Semiconductor Japan Ltd Headquarters ARCO Tower 15F 1 8 1 Shimo Meguro Meguro ku Tokyo 153 0064 Japan 0120 191014 or 81 3 5437 9125 support japan freescale com Asia Pacific Freescale Semiconductor Hong Kong Ltd Technical Information Center 2 Dai King Street Tai Po Industrial Estate Tai Po N T Hong Kong 800 2666 8080 support asia freescale com For Literature Requests Only Freescale Semiconductor Literature Distribution Center P O Box 5405 Denver Colorado 80217 1 800 441 2447 or 303 675 2140 Fax 303 675 2150 LDCForFreescaleSemiconductor hibbertgroup com Information in this document is provided solely to
10. the evaluation board The display capability using only the 5 onboard LEDs is consequently more limited The LIN bus is a low cost single wire serial bus ideally suited for use in many industrial and automotive applications A typical application is in a car door While a higher bandwidth CAN Controller Area Network bus is often used to transfer data to and from the door within the door a LIN bus with its limited data rate of 20 000 baud is adequate to distribute the information to and from the keypad mirror window and lock modules Each LIN node requires only 3 wires there is one LIN data line the other two connections being the positive and negative supplies T 2 freescale Freescale Semiconductor Inc 2004 All rights reserved semiconductor For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D The software for this LIN monitor is listed in appendix 1 It is simplified by the use of software drivers reference 2 that deal with the serial LIN protocol These drivers use the MC68HC908EY 16 s SCI module to interface with the LIN physical interface MC33399 and allow the application code to use simple Application Program Interface API function calls to read status information and data from the LIN messages This application note as well as describing the LED LIN monitor outlines how the drivers can be used to develop other LIN applications Use of the
11. their original slave names The simplest option is to retain these names as they are but they can be changed if desired S ave sx is the S19 record file required to program the flash of an MC68HC908EY 16 13 Close Codewarrior When relaunched the newly created project will be available for simulation and or dubugging under open recent in the file pull down menu Appendix lla Include file register definitions for the MC68HC908EY16 RK KKK KK kk Ck KK kk kk Ck CK Ck KC Kk kk kk ko Kk k I ke ke k k k k HCO8EY16 H Register definitions for the 908EY16 P Topping 24 01 02 FRR AIR AR k k RRR k k k k k k k RIA RR kkk I ke ke ke ee e e define PTA volatile unsigned char 0x0000 define PTB volatile unsigned char 0x0001 define PTC volatile unsigned char 0x0002 define PTD volatile unsigned char 0x0003 define PTE volatile unsigned char 0x0008 define DDRA volatile unsigned char 0x0004 define DDRB volatile unsigned char 0x0005 define DDRC volatile unsigned char 0x0006 define DDRD volatile unsigned char 0x0007 define DDRE volatile unsigned char 0x000A define CONFIG1 volatile unsigned char 0 001 define CONFIG2 volatile unsigned char 0 001 define TBCR volatile unsigned char 0x001C define TBSC volatile unsigned char 0x002B define TBCNTH volatile unsigned char 0x002C define TBCNTL volatile unsig
12. 0 baud rate if using a 9 8304MHz crystal define LIN BAUDRATE 0x04u Selects 9600 baud rate if using a 8MHz crystal define LIN BAUDRATE 0x30u This definition sets the number of user defined time clocks LIN IdleClock service calls recognized as no bus activity condition This number shall not be greater than OxFFFF ri define IDLETIMEOUT 500u endif defined HC08 endif define LINCFG LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com 21 Freescale Semiconductor Inc AN2432 D Appendix 1 slave id LIN message ID file ifndef LINMSGID_H define LINMSGID_H RK RIK KKK KK RIK IR IK A A E A A e IR AAR IR IRR IR IIR AR IA IR I ke ke ke Copyright C 2001 Functions Message Identifier configuration for LINO8 Slave sample with Freescale API Notes define LIN MSG 20 LIN RECEIVE define LIN MSG 21 LIN RECEIVE define LIN MSG 30 LIN RECEIVE this string is not necessary just as an example define LIN MSG 20 LEN 4 standard length define LIN MSG 21 LEN 4 standard length define LIN MSG 30 LEN 8 standard length endif defined LINMSGID H 22 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Appendix Ild slave id LIN
13. Freescale Semiconductor Application Note AN2432 D Rev 0 12 2002 LIN Sample Application for the MC68HC908E Y16 Evaluation Board by Peter Topping Applications Engineering Freescale East Kilbride Introduction The MC68HC908EY16 LIN evaluation board was designed to facilitate the development of LIN Local Interconnect Network reference 1 slave nodes and includes features to ease system development and debug These features include access to most of the pins on the MC68HC908EY 16 MCU an RS232 08 monitor interface and a connector to allow the use of a P amp E Cyclone or Multilink interface Any of these interfaces can be used in conjunction with Metrowerks Codewarrior to constitute a low cost development system allowing the development of MC68HC908EY16 applications including FLASH programming and software debugging While any kind of application is possible the board is primarily intended for LIN applications and includes an MC33399 LIN interface chip reference 4 The CD accompanying the board includes LIN software drivers which handle the LIN protocol using the EY 16 s SCI pins This allows very easy development of LIN slave nodes This application note presents a simple LIN monitor using the MC68HC908EY 16 LIN evaluation board AN2343 reference 8 includes a more sophisticated LIN monitor that displays data using an LCD module external to the PCB The monitor described here does not require any hardware in addition to
14. a4 jeuuoasip 4 NA S 2 ayp ypas Aua apoj 0Ju0JA 40 J 9JON Wild wy 20 z T AGAR SSA aan t TORUN on MOO 418 4 SSA dans Old vw 2 20 4 rere NOLINGHSNd MS c8 L 1 13539 4 T a6 wid Ox pee a 2a 70H1N02 z 250 ANIOd 1531 mST WRIT l Anong say ey ml on 51001 018 dfs 1250 T T ee 7350 L L 4 l ld 2 ww Te Hy D 91438069H ANIOd 1531 9 aa JOU ANIOd 1531 am eaiald _________ m cw vt oxy 0094 ww ee 1 Ed eel 3 Y 0 L I Le L9 l ld z Bats 0HOvL O014 FT 1250219 SSA a 12 0 214 tsa nid ISOWtOLd 5 H ls a HE SOW Sid Flan BRNO ree 0510214 8c 20V HORU281d IL RUDI T SOWOHIAL9ALd P 2 7 Heed 9 Hape BON MSS 90 L3 eee pavibald 6 69 1095 Ais SSA i 4 ep t oor tte woos ts dfs nu 1 13535 i Mayeg eui 128uuoasip suoneinBiuoa Jepeau uj NIT ei Ayoaup euo a amp 7 ayy uogoeuuos q uea pieoq stu ONINHYAA puaga SSA A ho 5001 PAPHBBEECON eu xL DAN fs M91 FE 8 HNI i m zn avo T h asepayu E dfi Jeats Aug 4 tdl ircuit diagram Go to www freescale
15. age 20 figure 3 Check message 30 figure 4 Figure 2 Main Software Flow Chart AN2432 D Software LIN Sample Application for the MC68HC908EY16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D The LIN driver functions LIN_IdleClock and LIN DriverStatus are then used to determine whether or not there is any activity on the LIN bus LIN IdleClock checks whether or not there is any bus activity If not it increments a counter whose value is compared with LIN IDLETIMEOUT LIN IDLETIMEOUT is defined as 500 in slave cfh If this number is exceeded the function LIN DriverStatus ceases to return a 1 LIN STATUS RUN indicating that the bus has been idle for in this case about 2 seconds If a master node is connected to provide LIN activity then the LED D5 will indicate its presence and that the MC33399 LIN physical interface is functioning correctly LIN_MsgStatus 0x20 is then used to check for the presence of a message with an ID of 20 The flow chart is shown in figure 3 In this case the timeout is determined by the application software and not by the LIN drivers The counter value chosen 250 means that the LED will go out if there is no message with this ID for a period of about a second An ID of 20 was used for the keypad in AN2205 Car door keypad using LIN reference 6 If this
16. and the addition of a link at J2 and between pins 11 and 13 of the Cyclone Multilink connector P4 LIN Sample Application for the MC68HC908EY 16 Evaluation Board 5 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D The board also incorporates a 9 8304MHZ canned oscillator module which is required to run monitor mode using the RS232 PC interface This module is fitted using a socket so that it does not need to be fitted if it is not required Cyclone and Multilink interfaces incorporate their own clock source and thus do not require the oscillator module There are pull up resistors on the IRQ and Reset pins Reset also has a pull down button and IRQ has a link that allows the connection of a zener stabilised 9 volts supply to enable entry into monitor mode which facilitates debugging and in circuit programming of the on chip FLASH memory The board includes 5 LEDs driven directly by MCU port pins These LEDs are used in the monitor code to show that the application is running and to provide some information on LIN bus activity 6 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com AN2432 D LIN evaluation board hardware Freescale Semiconductor Inc TIYA VSSA SSA Td3HA anro VSSA anyo asso Tg Hi3HA voda l l
17. ch TBCR 0x00 divide by 32768 244Hz TBCR 0x02 8MHz amp switch TBM on asm CLI enable interrupts LIN Init initialise LIN drivers while 1 if TBCR amp 0x80 is TBM flag set TBCR 0x08 yes clear it count increment tick counter if count amp 0x80 check MS bit of count tuf PTD 0x01 tick LED off else PTD amp 0x01 tick LED on LIN_IdleClock check for bus activity if LIN DriverStatus amp LIN STATUS IDLE bus idle for 500 tries PTD 0x02 yes activity LED off PTB 0x20 MC33399 enable low else amp 0x02 no bus activity LED on 14 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Software listing ROK KKK KK KK KKK KK IK KKK IA IR KARI IRR IR IIR AR IA II A I IK ID 20 FRR AAA e E A KCkCkC Kk kk IRR RK AA IR AAA IR IRR RII RAR k k k k k k k k k k k k k kk k if LIN_MsgStatus 0x20 LIN_OK new ID20 message if no 20 251 no already over 250 _20 no increment else no_20 0 yes new 20 received if no 20 250 any 20s in last second PTA 0x60 no ID20 LEDs off else PTA amp 0x20 yes ID20 LED on LIN GetMsg 0x20 Data buf and ge
18. eate a situation where personal injury or death may occur Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application Buyer shall indemnify and hold Freescale Semiconductor and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part 2 freescale semiconductor AN2432 D For More Information On This Product Go to www freescale com
19. enable system and software implementers to use Freescale Semiconductor products There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document Freescale Semiconductor reserves the right to make changes without further notice to any products herein Freescale Semiconductor makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or incidental damages Typical parameters which may be provided in Freescale Semiconductor data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts Freescale Semiconductor does not convey any license under its patent rights nor the rights of others Freescale Semiconductor products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the Freescale Semiconductor product could cr
20. evaluation board without additional hardware The evaluation board is supplied with the LEDemo application programmed into FLASH memory It will function as described in this application note by simply applying 8 12 volts to the battery B1 or LIN P2 connector This assumes that three jumpers are fitted J2 J1 IRQ IRQ HIGH and P4 pin11 pin13 The main use of the board is however to facilitate the development of LIN applications and for this a programming and development environment needs to be added The most sophisticated high level language programming and development environment is Metrowerks Codewarrior A limited version of Codewarrior is available on the WEB www metrowerks com and also on the CD supplied with the evaluation board This version is limited to 1K of code but a free 4K license upgrade is available from license Downloading and installation may require full admin access to the PC Accept the suggested paths and defaults e g do not select FlexLM option For FLASH programming and assembly code development P amp E s PROGO8SZ and ICS software is suitable These are available free from www pemicro com There are 3 main ways of connecting the evaluation board to the development environment The simplest in hardware terms is to use the board in monitor mode using an RS232 connection to a PC port All that is required is an 8 12 volt supply at B1 or P2 and a 9
21. f Figure 3 Message 20 Flow Chart LIN Sample Application for the MC68HC908EY16 Evaluation Board 11 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D LIN message with ID 30 received since last read Has this happened 250 times Increment error counter Y Y v Reset error counter Is error counter less than 250 Message 30 LED on Message 30 LED off Read message 30 Figure 4 Message 30 Flow Chart References LIN Protocol Specification Version 1 2 17 November 2000 LINO8 Driver User s Manual rev 1 1 13 March 2001 MC68HC908EY16A Advance Information MC33399 data sheet AN2203 LIN demo 2000 AN2205 Car door keypad using LIN November 2001 AN2264 LIN node temperature display June 2002 AN2343 HC908EY 16 LIN Monitor September 2002 Soros DC OMIT er a ul i 12 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Software listing Software listing ROK KKK KKK KK KK kCkCk IK KKK IA IR KAR IR IRR IR IIR AR IA IA I ke ke ek Copyright c 2002 908EY16 LED LIN demo Originator P Topping x Date 5th December 2002 Revision 1 0 Function Demonstration of LIN functionality using only the five LEDS on the EY16 LIN
22. he board also incorporates an RS232 serial port using an LT1181 interface chip The port with a standard 9 way D connector allows easy connection to the serial port of a PC to facilitate FLASH programming and software debugging using Metrowerks e g Codewarrior or P amp E e g ICS and PROGOS utilities If the MCU is de soldered there is sufficient space around its footprint to fit a target header for the MMDS MMEVS development system if this is preferred The MC33399 includes an internal 30kohm LIN pull up so this does not need to be fitted on the PCB if itis being used as a slave The capability to add a 1kohm master pull up is however incorporated The LIN bus is accessible via a 3 pin header that includes Vgar 12 volts and ground connections This 12 volt connection and the optional 1kohm pull up are reverse polarity protected Although the MC68HC908EY 16 has an on chip oscillator an 8MHz crystal is included on the board This can be used for applications which need the accuracy of a crystal and also allows easier development of those which will eventually use the on chip oscillator The intention is that an application can be fully written and debugged using an accurate clock prior to modifying it to incorporate any oscillator trimming of the internal clock that may be required This will always be necessary for LIN applications which use the internal oscillator Use of the crystal requires removal of the 9 8304MHz oscillator module
23. iconductor Inc AN2432 D RR RIK KK KK KK KKK IK IKK RIA AR RAR IR AR k k k k k k k k k k k k k k kk k I ke ke ke k ek Le HCO8EY16 JE These vectors are appropriate for the following MC68HC908EY16 7 mask sets OL38H 1L38H OL31N and 1L31N E le These mask sets had a fault in their interrupt vector table and AY Pis hence in the interrupt priorities T For the vector address in the corrected mask set 2L31N see the MC68HC908EY16 technical data sheet A Ee RK RIK KK KK KKK IK I KR RIA AR RAR IR A A k k A k k k k RA IR k k k k k k kk k k ke ke ke k k LIN_VECTF NULL OxFFDC Timebase E LIN VECTF NULL OxFFDE SPI transmit LIN VECTF NULL OxFFEO SPI receive LIN VECTF NULL OxFFE2 ADC LIN_VECTF NULL OxFFE4 Keyboard if LIN_VECTF LIN_ISR_SCI_Error OxFFEG ESCI error if defined MASTER used for Master node only LIN VECTF LIN ISR SCI Transmit OxFFE8 ESCI transmit x endif defined MASTER if defined SLAVE LIN VECTF NULL OxFFE8 ESCI transmit endif defined SLAVE LIN VECTF LIN ISR SCI Receive OxFFEA ESCI receive LIN_VECTF NULL OXFFEC TIMER B overflow LIN VECTF NULL OXFFEE TIMER B channel 1 LIN VECTF NULL OxFFFO TIMER B channel 0 LIN VECTF NULL OxFFF2 TIMER A overflow LIN VECTF NULL OxFFF4 TIMER A channel 1 if defined MASTER used for Master node only
24. ing at 1HZ To obtain full functionality a LIN master 4 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D LIN evaluation board hardware e g the VCT Volcano Communications Technologies LINspector should be added 11 To develop new LIN applications the source code file LEDemo c should be removed from the project and replaced with the new application source file s This and a procedure for creating a completely new Codewarrior project are described in detail in appendix Creation of a new project allows development of a different application with its own LIN characteristics message IDs etc without interfering with the supplied demonstration application The third and most sophisticated development possibility is to use an MMDS or MMEVS with an MC68HC908EY 16 EM module M68EMLO8EY To use this option the MCU should be removed from the board and replaced with the appropriate target header and cable to interface with the MMDS MMEVS Codewarrior is also suitable for use with this hardware set up LIN evaluation board hardware The schematic of the MC68HC908EY16 LIN evaluation board is shown in figure 1 Apart from the MCU itself two chips are required to facilitate a simple LIN node These are the LIN interface in this case the MC33399 and a 5 volt regulator The regulator used on the PCB is a 3 pin 7805 T
25. ior project are described in detail in appendix Creation of a new project allows development of a different application with its own LIN characteristics message IDs etc without interfering with the supplied demonstration application LIN Sample Application for the MC68HC908EY16 Evaluation Board 3 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Use of the evaluation board with Cyclone Multilink and MMDS MMEVS A second method of using the monitor mode development environment is to connect via the 16 pin P4 connector This is configured for a Cyclone or Multilink interface Operation is very similar to that described above the advantage being that the users PCB does not need to incorporate an RS232 interface or a 9 8304MHz clock source The high voltage for IRQ and the appropriate levels on pins A1 B3 and B4 are also supplied by the interface so no monitor mode hardware is required on the target hardware as long as these pins are allowed to go to the required levels Link J1 must be connected between 1 IRQ HIGH and pin 2 IRQ All other links and the 9 8304MHz canned oscillator module should be removed The following procedure should be used 1 Copy folder LinO8EY from CD to an appropriate place on local hard drive 2 Launch Codewarrior Programs Metrowerks CodeWarrior CW08_V2 1 CodeWarrior IDE 3 From folder LinO8EY drag file
26. message is present then the D7 LED is illuminated If present the message is read and D8 indicates the state of the most significant bit in the 4th byte This is the bit used for the child lock switch in the keypad application D6 is similarly used to indicate the presence of a second message with an ID of 30 figure 4 Clearly this is an arbitrary choice of message IDs and only a single bit of data can be displayed but it does indicate the full functionality of the LIN bus For example if the wrong baud rate is used the bus activity LED will still come on but LEDs D6 D7 and D8 will not 1 In an application in which the regulator can be controlled e g by using an LT1121 instead of an MC78L05 the enable pin of the MC33399 could be taken low to put the node into sleep mode by switching off the regulator and powering down the MCU The code to do this is included in the listing as a comment 10 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Software LIN message with ID 20 received since last read Has this happened 250 times Increment error counter Reset error counter Is error counter less than 250 Message 20 LED on Message 20 LED off Read message 20 Is MS bit of byte 4 of message high Data LED on Data LED of
27. ned char 0x002D define TBMODH volatile unsigned char 0x002E define TBMODL volatile unsigned char 0x002F define TBSCO volatile unsigned char 0x0030 define TBCHOH volatile unsigned char 0x0031 define TBCHOL volatile unsigned char 0x0032 define TBSCl volatile unsigned char 0x0033 define volatile unsigned char 0x0034 define TBCHIL volatile unsigned char 0x0035 define ICGCR volatile unsigned char 0x0036 define ICGMR volatile unsigned char 0x0037 define ICGTR volatile unsigned char 0x0038 define VECTF void const Vector table function specifier 18 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Appendix 116 vector c Appendix llb vector c define VECTOR C RR KKK KKK KK KK IKK IKK KK AIR IK KAR Kk Ck KK kk Kk Ck CK kk Kk Ck kk IR koe ke ke ek E Copyright C 2001 Functions Vectors table for LINO8 Drivers with Freescale Description Vector table and node s startup for HCO08 The users can add their own vectors into the table E but they should not replace LIN Drivers vectors Notes TKK KAR A KK A e A e AIK RRA Kk KC k k k Kk Ck k k k k k k k k Ck kk k k k ke kk Ck kk k kk k ke ke kk ke ke ke e if defined HC08 for HC08 if defined HCOBEY16
28. pin straight through cable to a PC running appropriate software Use of the P amp E tools is very straightforward In order to get into monitor mode at 9600 baud all that is required is the installation of the 9 8304MHz canned oscillator module and the addition of a link between pins 2 IRQ and 3 VTST of J1 This provides 9 volts to the IRQ pin No other links should be installed The board supplies pull ups and pull downs to provide the appropriate levels on pins A1 B3 and B4 for entry into monitor mode 2 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D Use of the evaluation board without additional hardware To develop LIN applications in Metrowerk s Codewarrior is an appropriate development environment To use Codewarrior with this simple hardware set up use the following procedure 1 11 Copy folder LinOBEY from CD to an appropriate place on local hard drive Launch Codewarrior from Start menu Programs Metrowerks CodeWarrior CWO08 V2 1 CodeWarrior IDE Copy paste a shortcut for future use From folder LinO8EY drag file sample ide EYLEDemo LEDemo mcp into Codewarrior window Switch on the board and run the debugger by clicking on the green arrow Error messages relating to the limitations of the Codewarrior license may appear they will not reoccur as long as the
29. rectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that Freescale was negligent regarding the design or manufacture of the part Freescale and the Freescale logo are registered trademarks of Freescale Ltd FRR AIR e E AR AIR A I AR A KR A A IR AAR IR IRR IA IIR ROK KIRK KKK KK KK IK IK KAA IR AAR IR IRR IA IIR AA IA IR I RK te We Header file includes and globals eK AIR e E AKA Ck A AIR AAR Kk KC Kk Ck Kk include HCO8EY16 h include lt linapi h gt unsigned char Data_buf 8 unsigned char count 0 unsigned char no_20 0 LIN Sample Application for the MC68HC908EY 16 Evaluation Board 13 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D unsigned char no_30 0 ROR KKK KK KK KK KKK KR IK KK KR IIR AAAI IRR IR IIR AA IA IA I ke ke ek Function name Main AR RR A e e AE A RAIA IA AAA IR IRR k k k k k k k AA k k k k k k k k k ke ke ke ke I void main void CONFIG1 0x01 disable COP y CONFIG2 0x29 ext clk fast timebase PTB 0x20 MC33399 enable high Ka DDRA 0x7C A4 5 amp 6 out for LEDs DDRB 0xE7 B5 out for 33399 enable DDRC 0x83 enable MCLK C2 DDRD 0x03 DO amp D1 out for LEDs while ICGCR 0x13 switch to ext clock ICGCR 0x12 and wait for swit
30. rest of this procedure is followed and the debugger is kept open If any compilation or linking is required it will happen before the debugger starts up In Component pull down menu select Set target and then HC08 and P amp E Target Interface Press OK If prompted by a window headed Attempting to contact target and pass security select Target Hardware class 1 and click on contact target with these settings This window may also prompt for any monitor mode security issues Check PEDebug pull down menu for device EY16 and mode In circuit debug programming and if required change to these settings In PEDebug pull down menu select load and file slave abs in bin directory This will overwrite the code in FLASH with that contained in slave abs select yes when prompted for permission to overwrite FLASH Run program by clicking on green GO arrow Code should now run If the source code has not been changed then the LED LIN monitor described in this application note will now be running and LED D4 flashing at 1HZ To obtain full functionality a LIN master e g the VCT Volcano Communications Technologies LINspector should be added To develop new LIN applications the source code file LEDemo c should be removed from the project and replaced with the new application source file s This and a procedure for creating a completely new Codewarr
31. se the LINOS slave settings leftmost icon to select target access paths Remove path Project EYLEDdemo to ensure that it isn t inadvertently accessed The path Project LINnode is required but should already have been added automatically If any additional include files are required they should be added to folder MinO8EYwnc Include files can optionally be added to the project as described above for source files The file hc08ey16 prm will have been copied to MinO8E Y sample ide LINnode hc08ey16 prm and this file should be inspected and edited or replaced as necessary Sometimes no modification will be necessary In cloned projects compiler macros are set up to use s ave cfg in place of lincfg h and slave id in place of linmsgid h see reference 2 slave cfg and slave id will have been copied into MinO8E Y sample LINnode and should be inspected and edited if changes are required In particular slave id should be modified to specify the appropriate IDs and s ave cfg should be modified to enter the appropriate values for the baud rate and the bus timeout The s ave cfg LIN Sample Application for the MC68HC908EY 16 Evaluation Board 17 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D and s ave id files used in LEDemo are shown in appendix II 12 Many files within the project for instance the output files slave abs and slave sx will have retained
32. t data if Data_buf 3 amp 0x80 check MS bit last byte PTA amp 0x40 bit high LED on else 0 40 bit low LED off RK RK KK KKK KK KK IKK IK KK A A IR AAA IR IRR IR IIR AR IA I I ke ke ke ke X ID 30 FERRI AR AR RRR A IA RK KR AA IR AAAI IA ko k k k if LIN MsgStatus 0x30 LIN OK new ID30 message if no 30 lt 251 no already over 250 _30 no increment else no_30 0 yes new 30 received LIN Sample Application for the MC68HC908EY16 Evaluation Board 15 For More Information On This Product Go to www freescale com Freescale Semiconductor Inc AN2432 D if no 30 gt 250 data in last second 0x10 no ID30 LEDs off else PTA amp 0x10 yes ID30 LED on LIN GetMsg 0x30 Data buf read data not used X ROR KKK KKK kk Ck Kk kk IKK Ck Ck kk Ck AA IIR KAKI IRR Kk CK CK kk Kk KC kk A k Kk kk kk ke kk ke ke ke Function LIN Command Description User call back Called by the driver after transmission or reception of the Master Request Command Frame ID 0x3C KR AIR e E RRR IRA IRR RAR IR AAAI IRR Kk CK CK k k void LIN Command 1 1 16 LIN Sample Application for the MC68HC908EY 16 Evaluation Board For More Information On This Product Go to www freescale com Freescale Semiconductor Inc
Download Pdf Manuals
Related Search