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Hm, I guess I was searching for the wrong keywords. Embarassed

Reading....

Edit: Alright, after a fair amount of reading, I thought I'd found one problem: The PIC was running at 3.3V, as I menti ...

I mentioned some lockups in do include it, the lockup still occurs even if the function never gets called. Simply including it seems to cause problems.

The problem: The PIC chip locks up solid af ...

The spike appeared to be happening at the end of what should have been a logic high (I think that's the proper terminology), being driven there by the DS3231, but as best as I can figure, the PIC trie ...

Some updates:
- The oscilloscope is a [url=http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=14408&lc=EN]Tektronix TDS 210.
As for the probes, they're 1x/10x probes, without any ...

I think that a flickering effect like that can result from very rapid updates to the display. Either add in some kind of a delay, or else have a timer-triggered flag to enable an update, perhaps every ...

Although 10k pullup is possibly a bit high, it should not cause the discussed behaviour. I asked for the pullup, because SDA seems to have a rather slow risetime, that can't be explained with e.g. 20 ...

I edited my post; the FUSES I posted apparently was from a slightly older version of this code.
LVP and DEBUG have in fact been disabled.

And I'm not sure how much I'm really permitted to post of ...

It's SDA, and just one bit of the data that's being sent.
The SCL line looks about like you'd expect - just series of evenly-spaced pulses during the time between i2c_start and i2c_stop.

In this p ...

Definitely do get rid of any delay_ms and printf's inside the interrupt.
Get the data first, maybe send the data to a holding array, and then afterward print out what's inside the array.
At least th ...

Update: Problem solved, apparently. As per recommendations here, I dropped the value of the pullup resistors, and dropped the nofloat_high. Once that was done, the odd 0.48V bumps disappeared, as did ...

bkamen - you're closer to the field than me, I think.
I'm a mechanical engineer by degree; this job has me doing some mechanical design, some light electronic design, and a fair amount of programming ...

Typically no.

if (expr) {
}

and

if (expr)
{
}

are functionally the same.

The braces on separate lines I believe is a more proper etiquette.
Ok, I figured as much.
I just wanted ...

Huh, I didn't notice that I wasn't automatically logged in after activating the account. Oops.
(OP above is mine. )