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Can't view modified program memory using MPLAB

 
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JerryR



Joined: 07 Feb 2008
Posts: 167

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Can't view modified program memory using MPLAB
PostPosted: Fri Oct 01, 2010 12:01 pm     Reply with quote
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!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Oct 02, 2010 12:32 pm     Reply with quote
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.
JerryR



Joined: 07 Feb 2008
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PostPosted: Mon Oct 04, 2010 6:10 am     Reply with quote
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");

Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Oct 04, 2010 9:15 am     Reply with quote
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
JerryR



Joined: 07 Feb 2008
Posts: 167

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PostPosted: Mon Oct 04, 2010 10:04 am     Reply with quote
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!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Oct 04, 2010 1:55 pm     Reply with quote
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.
JerryR



Joined: 07 Feb 2008
Posts: 167

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Program memory read (SOLVED)
PostPosted: Mon Oct 04, 2010 2:36 pm     Reply with quote
Simple fix. Have to DEBUGGER > READ to update program memory display.
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