[sdiy] PIC freakout?

[Paul Maddox]

I'd also check the oscillator/crystal.

I got caught out by one of those recently.... last thing in the world I expected !

Paul

On 22 Nov 2011, at 17:26, Karl Ekdahl wrote:

> Just measured all pins, nothing's connected to GND or V+ (except those that should). I guess it's possible that one of my peripheral ICs has gone bad and is outputting something??
> 
> Karl
> ________________________________
> Från: Eric Brombaugh <ebrombaugh1 at cox.net>
> Till: synth-diy at dropmix.xs4all.nl 
> Skickat: tisdag, 22 november 2011 12:15
> Ämne: Re: [sdiy] PIC freakout?
> 
> On 11/22/2011 10:08 AM, Karl Ekdahl wrote:
>> Hey list
>> 
>> So this pic that i've been using for a few months, with the same code, all of the sudden started freaking out and spitting out garbage after about 1-2 seconds of being on and i have no idea why. I've tried several new pics with the same code, i've even tried minimizing the code (even though it worked just fine before and i didn't change it) to just have some test-stuff left but to no avail. I feel like not all the PICs i tried could have been blown (as it must have happened as soon as i put them in the socket in that case) and since they still program that's a good testament to that too. I've checked the power-lines and they seem fine. I'm using the internal oscillator so no faults there.
>> 
>> Any ideas? Could it be something with the powerlines even tho they look just fine on the scope? I tried hooking up a big cap to stabilize any unwanted oscillations but no change.
> 
> Any changes in the I/O loading? I've seen odd stuff when there's 
> contention on the GPIO logic levels (ie PIC tries to drive a '1' into a 
> grounded pin, etc).
> 
> Eric
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