Application Note 110
Contents
1. Stop PS1 R0 c 0000 Sts 0 View Trace Sec 0 000000 Assemble Debug Window hil stop lt wig WZ Command fei x dScope 251 Windows 1 3e Command Window COPYRIGHT KEIL ELEKTRONIK GmbH 1996 Running in Demo Mode 2K gt Idos ASM ASSIGN BreakDisable BreakEnable BreakKill BreakList TAB INS 4 gt LOADING A CPU DRIVER dScope performs simulation and target debugging by using CPU driver DLLs to provide complete support for each different type of CPU For example the 80251S DLL provides simulation support for the Intel 8x251Sx devices The 82930 DLL provides simulation support for the Intel 82930 device RISM251 DLL and RISM930 DLL provide target debugging support for hardware using the RISM251 and RISM930 monitor programs Using the drop down box in the main menu select RISM930 DLL for the RISM ismg30 dil monitor on the USB evaluation board If the RISM930 DLL driver does not appear p in your menu you may select the RISM251 DLL driver These two drivers are virtually identical Alternatively you may download the latest software from the Keil web site at http www keil com usb or you may contact technical support at 800 648 0251 and request the latest drivers rane Soll Page 3 of 6 Revision date 23 Feb 97 Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT 110 After successfully loading the RISM CPU d2. Command Window using the mouse and enter the following P1 P1 0x81 The Command Window should appear as follows Command iof x gt El gt P1 0zD5 gt P1 0z81 gt Idos ASM ASSIGN BreakDisable BreakEnable BreakKill BreakList 4 TAB INS And the LEDs on the USB evaluation board will change so that only P1 7 and P1 0 are illuminated WHAT TO DO IF IT DOESN T WORK There are very few things to break when you interface to your target using the dScope debugger Most problems are caused by communication failures at the outset When dScope cannot initially communicate with the target system the following dialog box appears TARGET SYSTEM MOT FOU I Picar check the settings and pour target synke m Heuednabe 300 Tiii Make certain that the correct COM port and baudrate are specified and click Try Again Page 5 of 6 Revision date 23 Feb 97 Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT 110 Refer to Verifying Serial Port Operation above for a more in depth discussion of how to test the PC to USB board interface Many of the problems should be ironed out manually before attempting to use the dScope debugger Note that no errors should be generated when dScope successfully initializes the USB evaluation board using RISM If you consistently get either of the following error messages there is a problem communicating with RISM xxx Seri
3. Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT_ 110 OVERVIEW This application note discusses how to solve the problems you may encounter when you interface the Keil dScope debugger to the Intel USB Evaluation Board using RISM Typically these problems are not software related They are related to proper configuration or connection of the serial ports This application note does not discuss how to create programs for the evaluation board For more information on creating USB programs refer to Keil Application Note 109 CONFIGURING THE USB EVALUATION BOARD The USB evaluation board from Intel includes an 8x930Ax microcontroller with built in USB protocol circuitry This board must be properly configured before anything else will work Make sure you configure the board exactly as specified in the 8xC93x Eval Board Users Guide and in the 8X930xx Adapter Board User s Guide CONNECTING YOUR PC TO THE USB EVALUATION BOARD Interfacing to RISM running on the USB evaluation board should be fairly straight forward The following sections explain the various features and caveats you should take into consideration CHOOSING A SERIAL PORT There are two serial ports on the USB evaluation board One is driven by the external UART The other is driven by the on chip UART The external 16550 UART uses the serial port connector at J2 to External UART connect to your PC This is the same chip used in t
4. al I O time out xxx Serial transmission failed Req 4 Act 0 Since there have been several iterations of RISM and several iterations of our interface DLLs make sure you have the latest version of our tools You may download the latest software from the Keil web site at http www keil com usb or you may contact technical support at 800 648 025 1 and request the latest drivers CONCLUSION There are a number of considerations when connecting the USB evaluation board to your PC s COM ports Most problems are due to improper RS 232 port configuration incorrect port selection and speed conflicting PC interrupts and laptop power down circuitry Itis our opinion that RS 232 will continue to be the most trouble shot interface in the world That is until USB replaces the COM port on the PC Copyright 1997 Keil Software Inc All rights reserved In the USA In Europe Keil Software Inc Keil Elektronik GmbH 16990 Dallas Parkway Suite 120 Bretonischer Ring 15 Dallas TX 75248 1903 D 85630 Grasbrunn b Munchen USA Germany Sales 800 348 8051 Phone 49 089 45 60 40 0 Phone 972 735 8052 FAX 49 089 46 81 62 FAX 972 735 8055 E mail sales us keil com Internet htto www keil com E mail sales intl keil com support us keil com support intl keil com Page 6 of 6 Revision date 23 Feb 97
5. am that is running using the stop button CPU Parameters Dialog Box The MCS 251 Parameters dialog box shows you settings in the configuration bytes of the 8x930Ax Binary mode indicates that the 8x930Ax decodes opcodes for 251 binary mode Source mode indicates that the 8x930Ax decodes opcodes for 251 source mode Framesize 2 indicates that 2 bytes are saved on the stack when an interrupt occurs low 2 bytes of the program counter Framesize 4 indicates that 4 bytes are saved 24 bits of the program counter and PSW1 Refer to the SX930Ax Universal Serial Bus Microcontroller User s Manual for more information about source and binary mode and interrupt frame sizes Page 4 of 6 Revision date 23 Feb 97 Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT 110 Parallel Ports dScope makes it easy to view the I O ports of the 8x930Ax using the esto Parallel Ports dialog box Using this dialog box you can see the state of E ez Frp trpe each bit in each port mln PrE EIE Pa eF prere be bo F NOTE Pe fe fe fe fw ie fo Be Fe You cannot change the port bits from this dialog You may however qe change them from the Command Window VERIFYING THE DSCOPE TO RISM INTERFACE The following example shows you a simple way to confirm that dScope and RISM are communicating You can display and alter the contents of memory on the USB evaluation board using dScope s Command Window Select the
6. ck to see if the COM port you selected is shared with an internal modem Remember that COM ports and internal modems may not share interrupts E Make sure the serial cable is good You should use a 9 pin male to 9 pin female that is wired straight through pin to pin E Laptop users should make sure to disable power down features of the serial ports If power down is enabled and if you don t use the serial port for a while your laptop may power the COM ports down and you may lose your connection with the USB evaluation board Page 2 of 6 Revision date 23 Feb 97 Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT_110 E Since the RISM communications protocol does not include a checksum or CRC byte the connection between the USB board and the PC must be error free Any line glitches will cause problems and will probably be interpreted as RISM commands INTERFACING TO RISM USING DSCOPE Once you have verified proper connection between your PC and the USB evaluation board you are ready to use the dScope debugger When dScope is invoked the following screen appears dScope OO x File View Setup Help alo 4 4c bse el Commands Gol GoTilCurs StepOut Steplnto StepOver Stop R0 00000000 gga eh AE at Register Window VR1i6 0090 0000 Go GoTilCurs WR20 00 0000 Steplnto WYR24 0000 0000 VR28 0000 0000 StepOver DPTR 0001 0000 SP 0000 0007 StepOut Sy RO
7. erminal program with your PC to verify proper connection with the USB evaluation board The following steps show what to do 1 Connect a COM port from your PC to the appropriate serial port connector on the USB board 2 Start your terminal program and set the serial port parameters to one of the following E External UART 19 200 baud 8 bits 1 stop bit no parity E On Chip UART 9 600 baud 8 bits 1 stop bit no parity r Apply power to the USB evaluation board The LEDs on the board should cycle P1 0 P1 1 P1 2 and so on You should end up with P1 0 P1 2 P1 4 P1 6 and P1 7 illuminated If all LEDs are illuminated something is holding the board in RESET RISM uses DTR to start and stop running a program You may need to enable hardware handshaking in your terminal program to the let the board run e As you type characters in your terminal program you should see the LEDs on the USB evaluation board change to reflect the ASCII value You should also see the next character echoed to your terminal For example if you type 1 you will see 2 echoed TROUBLESHOOTING THE SERIAL PORT After following the above steps you should be able to communicate with the USB evaluation board If not the following suggestions may help E Make sure you have selected the correct COM port E Make sure that the UARCT DIP switch is on if you use the external UART on the USB evaluation board This switch must be off to use the on chip UART E Che
8. he PC for Parameter Specification serial communications and it should work well with any PC We Baud Rate 19 200 recommend using the external UART for the following reasons Serial Jack J2 Label UART E When you debug using the external UART the on chip UART of the 8x930Ax is available for your target program You may need the on chip UART to interface a serial device to USB E The baud rate of the external UART depends on the programmed divisor and the clock rate of an external oscillator It does not change when the 8x930Ax goes into power down mode The on chip UART uses the serial port connector at J1 to On Chip UART connect to your PC Your target application may not use the Parameter Specification on chip UART when you debug using RISM We do not Baud Rate 9 600 recommend using the on chip UART for debugging Serial Jack J1 E RISM can only use the on chip UART at 9600 baud Label SERIAL I O Downloading software takes longer due to the slower baud rate Page 1 of 6 Revision date 23 Feb 97 Keil Software Inc Application Note Solving RISM USB and dScope Communication Problems APNT_ 110 Timer2 is used as the baud rate generator and is not available for your target programs The baud rate of the on chip UART changes when the 8x930Ax goes into power down This will probably change in future revisions of the chip but for now it plays serious havoc with the debugger VERIFYING SERIAL PORT OPERATION You may use a t
9. river and negotiating with the USB evaluation board the Command Window appears as follows Command Ae E RISM251 Driver for dScope 1 6 for maximum performance and features install Keil Monitor 251 into your target system gt Idos ASM ASSIGN BreakDisable BreakEnable BreakKill BreakList 4 TAB INS THE PERIPHERALS MENU When dScope successfully loads the RISM CPU driver the Peripherals menu is es added to the main dScope menu This menu gives you access to dialog boxes that Jans display many of the on chip peripherals including the I O ports the Interrupt SFRs i the timer counters and the serial port In addition dialogs are available that display 2 CPU parameters programmed in the configuration bytes and that let you edit the configuration information used by dScope to communicate with RISM Configuration Dialog Box The Configuration dialog box lets you change the parameters used Port settings to communicate with RISM Unless special circumstances exist Pot com z App you should leave these parameters set as shown The Port will be Hasan Previous _ the COM port to use to communicate with RISM The Baudrate ee Target configuration fdata will be 19 200 if you use the USB evaluation board external ae UART and 9 600 if you use the USB evaluation board on chip A a creer I code UART When selected Enable serial break lets you halt a progr
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