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write_program_memory doesn't work on dsPIC33EP [solved]

 
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laser_scientist



Joined: 26 Jun 2013
Posts: 7

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write_program_memory doesn't work on dsPIC33EP [solved]
PostPosted: Wed Sep 25, 2013 12:37 pm     Reply with quote
Hello,

I am trying to use the write_program_memory() function on a dsPIC33EPMU806, and can't seem to get it to work. I have a simple program for testing (below). I've tried changing the buffer allocation size, the byte count for the write, the stack allocation. Regardless of settings, I get the following error:

Trap due to unimplemented RAM or PSV memory access, occurred from instruction at 0x0002b0

I've looked, and this is inside the CCS write_program_memory() routine.

The read_program_memory() function seems to work.

Code:

#include <33EP256MU806.h>
// #build (stack=1024)

#use delay(crystal=8Mhz, clock=120Mhz)

#define BUF_DECLSIZE 1024
#define BUF_READSIZE 384

char buffer[BUF_DECLSIZE];

void main(void)
{
   int32 addr_r, addr_w;
   int16 count;

   addr_r = 0x00000200;
   addr_w = 0x00001000;
   count = BUF_READSIZE;

   read_program_memory(addr_r, buffer, count);
   write_program_memory(addr_w, buffer, count);

   while (1);
}


I'm using version 5.011 of the compiler.

Has anyone else experienced this problem?

Thanks,
Dan
laser_scientist



Joined: 26 Jun 2013
Posts: 7

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Problem is in MPLAB
PostPosted: Wed Sep 25, 2013 2:02 pm     Reply with quote
Found the problem. Apparently MPLAB SIM doesn't implement TBLWTx commands properly. I was trying to simulate the program before testing in hardware. The hardware worked. The simulation didn't...
Ttelmah



Joined: 11 Mar 2010
Posts: 19366

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PostPosted: Thu Sep 26, 2013 12:35 am     Reply with quote
As a 'comment', longer term, you should reserve the area you are going to write 'to' with an #ORG, otherwise the compiler may (when the code gets more complex), accidentally start putting things there.

Best Wishes
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