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JerryR
Joined: 07 Feb 2008
Posts: 164
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| Can't view modified program memory using MPLAB |
 Posted: Fri Oct 01, 2010 12:01 pm |
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I executed a small section of code to read, then write, and, finally, read back a small block of data in Program Memory on a 18F2580. The data is read back as expected from program memory, but I can't seem to be able to view it in MPLAB (View-Program Memory). When viewing the addresses which should have been modified, I read FFs.
What am I missing?
Thanks! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Oct 02, 2010 12:32 pm |
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This may be a question for the Microchip MPLAB forum. But for help on
this type of question, you need to tell us your test environment. Are you
testing this in MPLAB simulator ? Or are you testing it with the ICD2 (etc)
on a hardware board, while running the ICD2 as a debugger ?
You need to post an extremely short but compilable test program.
And also post the compiler version and MPLAB version. |
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JerryR
Joined: 07 Feb 2008
Posts: 164
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| Posted: Mon Oct 04, 2010 6:10 am |
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Hello PCM:
Yes, Microchip's forum might be the best place to go, however I'm using CCS PCWH v3.249 and a snippet of your code for the test. Therefore, I'm assuming this forum might be the place to go.
More information:
Using version 8.53 MPLab
PCWH: version 3.249
Debugger: Microchip Real ICE
Microcontroller: PIC18F2580
Test code called from MAIN. Runs successfully as it prints out stored 3,3,3,3,1,1,1,1 correctly after demonstrating it has successfully erased program memory to "FF".
Problem is that after code has run to breakpoint at bottom of code, change is not apparent in View > Program Memory at addresses around 0x4200.
Any suggestions?
Thanks!
Test code (look familiar?):
| Code: |
void Mem_Write(void)
{
int8 i;
int8 write_data[8] = {3,3,3,3,1,1,1,1};
int8 read_data[8] = {0,0,0,0,0,0,0,0};
#define ROM_ADDR 0x4200
printf("Flash write size = %u\n\r", getenv("FLASH_WRITE_SIZE"));
printf("\n\r");
// Erase flash memory.
erase_program_eeprom(ROM_ADDR);
// Read flash memory.
read_program_memory(ROM_ADDR, read_data, sizeof(read_data));
// Display it, to show it's erased.
printf("Flash memory after being erased: ");
for(i = 0; i < sizeof(read_data); i++)
printf("%X ", read_data[i]);
printf("\n\r");
printf("\n\r");
}
// Now write 8 bytes.
write_program_memory(ROM_ADDR, write_data, sizeof(write_data));
// Read them back.
read_program_memory(ROM_ADDR, read_data, sizeof(read_data));
// Display data read from Flash memory.
printf("Flash memory after being written: ");
for(i = 0; i < sizeof(read_data); i++)
printf("%X ", read_data[i]);
printf("\n\r");
printf("\n\r");
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Ttelmah
Joined: 11 Mar 2010
Posts: 19348
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| Posted: Mon Oct 04, 2010 9:15 am |
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Er.
What you have posted, will never execute the lines after the fourth printf. There is a terminating '}', so the code beyond here will never be run, leaving the memory erased....
Best Wishes |
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JerryR
Joined: 07 Feb 2008
Posts: 164
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| Posted: Mon Oct 04, 2010 10:04 am |
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Hi: Thanks for your response. No the code works as planned, I didn't copy the final "}". The code as executed produces the intended results, I just can't view the modified program memory locations in MPLAB. MP Lab reports those modified locations as all "FF".
Any ideas?
Thanks! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Oct 04, 2010 1:55 pm |
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Test it with a different programmer/debugger such as ICD2. If it works,
then it's a problem with Real Ice, or MPLAB & Real Ice, or their configuration. |
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JerryR
Joined: 07 Feb 2008
Posts: 164
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| Program memory read (SOLVED) |
| Posted: Mon Oct 04, 2010 2:36 pm |
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| Simple fix. Have to DEBUGGER > READ to update program memory display. |
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