[sdiy] PIC freakout?

[Dave Kendall]

I had a similar bizarre fault to Paul's recently in a MIDI to CV 
converter, it took many hours to find....

http://electro-music.com/forum/viewtopic.php?t=49950

cheers,
Dave



On Nov 22, 2011, at 17:33, Paul Maddox wrote:

> 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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