I'm stumped.

I'm using the PIC C compiler (CCS)

I have a 16C63 which runs some initialise code
and part of a while
loop and then does a sleep.  The chip is woken
up by either a change in level on the RB0 or
edge on RB6 or RB7.

The code works perfectly on our emulator but
when I burn windowed version it runs and goes to
sleep and then when the wakeup signal is given
there is a delay and then the code runs from the
start again instead of carrying on in the loop.

If i burn the EPROM and power up the code works
perfectly the first time without doing the
second run from start but when I turn the power
off start again it does the second "reboot".

The bare bones code is:

#fuses WDT

main(){
  initialise();
    while(1){
      statements...
      restart_wdt();
      sleep()
      #asm
        NOP
      #endasm
        //go back to sleep if just watchdog wakeup
      while (restart_cause() == WDT_FROM_SLEEP){
        restart_wdt();
        sleep();
        #asm
          NOP
        #endasm
        }
        more statements
    }

The NOPs are because the instruction after SLEEP
is discarded.

Can anybody spot any glaring mistakes?  By
putting in some printf statements I can see that
the code runs to where it goes to sleep but when
the RB0,6 or 7 is "stimulated" the uP runs from
the start and the "more statements" code isn't
executed.








Paul Gaastra                              pgaastra@hort.cri.nz
Technology Development Group, Hort Research
Private Bag 3123            phone +64 7 8584745
Hamilton, NEW ZEALAND         fax +64 7 8584705