I always setup a dummy interrupt routine and test for watchdog timeout
in my code with just a NOP. That way you can put a breakpoint on the NOP
and quickly find out if anything unexpected is going on.
Roger

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Mark Gojkovic
Sent: 04 July 2003 04:44
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: What am I doing wrong with this code?

Hi,

I am having problems with the PIC ceasing to work after a certain number
of instructions has been used up. I have no idea what's causing this so
I hope that I can get some help.

I am trying to make a small "alarm" box that will dial a pre-
programmed phone number when a switch is closed. The dialing is done
using a Mitel MT8880 DTMF transceiver and the number storage is done
via two switches (ie click*click*click*ENTER) should store 3 as a
digit in the phone number. Nothing too complex.

The problem I am having (and have been having for over 2 weeks now)
is that any time I would add some "code-intense" routines the PIC
would stop working when programmed. To see where the problem occurs I
started with a piece of working code. Then I started adding NOPs
until it crapped out. The PIC doesn't just stop working but it stays
in routines it shouldn't stay in, and skips others that it must go
to, etc.

The only difference between the two attached code listings is an
additional
NOP in the non-working program. I have no idea why this is happening
since I am not even using half of the PIC16F84's program memory. I
have used PICs before and nothing like this has ever happened.
Additionally, anyone I've asked had no idea what the problem is.

Code listings:

http://www.contemporarycustoms.com/images/not_working.txt

http://www.contemporarycustoms.com/images/working.txt

I tried the same code (with some minor processor-specific changes) on
a PIC16F876 and a PIC16F628 with identical results. I am using MPLAB
(v. 5.00.16) and PicStart Plus running in WindowsXP.

Any help would be appreciated while I still have hair left to pull
out. :-)

Mark

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