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Configuration bits problem

 
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Lucky Chris



Joined: 04 Dec 2006
Posts: 1

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Configuration bits problem
PostPosted: Tue Dec 05, 2006 11:54 am     Reply with quote
Hi,

I am using a PIC12F509 for a small project, and I encountered a problem during I/O testing with a simple program.

The compiler seems to overwrite my configuration bits (#fuses INTRC, NOMCLR, etc.) with the ones in MPLAB IDE Configure->Configuration bits. If I change the #fuses, nothing changes, unless I change it in MPLAB IDE.

Code:
#if defined(__PCB__)
#include <12F509.h>

#fuses INTRC
#fuses NOWDT
#fuses NOMCLR // NOMCLR -> No master clear, RE3 enabled as I/O
#use delay(clock=8000000)

void main (void)
{
   int toggle = 0;
   SET_TRIS_B(0x00);
   while(TRUE)
   {
      if (toggle == 0)
      {
         toggle = 1;
      }
      else
      {
         toggle = 0;
      }
      output_bit(PIN_B1,toggle);
      delay_ms(100);
   }   
}


I've worked with PIC18F4431 before and never seen something like that.

Your ideas will be really apreciated,

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Dec 05, 2006 1:08 pm     Reply with quote
I tested your program with PCB vs. 3.249 and I saw the same problem.
This was with MPLAB vs. 7.20.

I was able to fix it by going into the Project/Build Options menu in
MPLAB, and changing the Debug File type to "Expanded COD format".

It was originally set for "COFF format" and that's the problem. MPLAB
apparently can't read the Config bit settings in that mode. It's probably
a bug. PCM and PCH don't have this problem in vs. 3.249.
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