Sporadic Interrupts

[Bryan]

My program uses external interrupts which are triggered by pushbuttons to toggle states. My particular application is designed to run longterm so it will be on for days, weeks, or even months. The problem I have been noticing is that sometimes I will toggle states but then after a few hours it will toggle itself back to the initial state automatically, almost as if the PIC is resetting (When I want it to remain in the toggled state permanently until the button is pressed again). I don't have a WDT or any other reset functions set up, so I'm not sure why this would be happening. Is there any chance it could be getting noise from somewhere and triggering the interrupt instead of resetting? My circuit is all in a breadboard with jumper wires going everywhere right now in a jumbled mess so that idea isn't far-fetched. Any ideas? Here is my setup code:

[valemike]

So you're wondering if you're actually resetting or noise is causing the PIC to think there are button presses, and bringing you back to your initial state?

If you are conveniently hooked up to Hyperterminal, you can do a printf in one of your first instructions in main():

[kender]

If you think that noise is a problem, you can add a pull-down resistor to you interrupt line and/or put a 0.1uF cap from interrupt line to ground. The latter, though, will increase the rise time of your interuupt signal.

Nick

[Humberto]