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PCH functions setjmp and longjmp

 
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Kieran



Joined: 28 Nov 2003
Posts: 39
Location: Essex UK

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PCH functions setjmp and longjmp
PostPosted: Mon Mar 22, 2004 12:04 pm     Reply with quote
I have used these functions successfully with a PIC16F876 but when using them with a PIC18F452 the programme crashes and resets via the watchdog when I execute the longjmp. Crying or Very sad

Code:
#include <setjmp.h>

jmp_buf myenv;

// in main

  do
     {
     restart_WDT();
     setjmp(myenv);  // Back to here


// in a function

   do
      {
      key = fetch_key();  // wait for key press
      if (key == 'C')  // abort key ?
         {
         err = 0;
         longjmp(myenv,1);  // should jump to main but crashes
         }
      }
   while (key != 'E');


Compiler version 3.184

Anyone got these to work on a PIC18Fxxx ?

Thanks
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Tue Mar 23, 2004 12:33 am     Reply with quote
Are you kicking the watchdog in the fetch_key() function? If not, that may cause the program to reset.
It's hard to say what the problem is. Post your full code (incluing the setjmp.h file) so we can take a look at it.
Kieran



Joined: 28 Nov 2003
Posts: 39
Location: Essex UK

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PostPosted: Tue Mar 23, 2004 9:29 am     Reply with quote
The fetch_key() function includes a delay_ms function with watchdog.
The code for the full project is long, I am trying a stripped down version (which works!). So I will try to reintroduce the bug then post it.
Kieran



Joined: 28 Nov 2003
Posts: 39
Location: Essex UK

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PostPosted: Wed Mar 24, 2004 5:08 am     Reply with quote
After further testing I have given up with the longjmp approach. It worked sometimes, no time to debug further.
Thanks
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