ADC in sleep locking up

andrewg · Posted: Mon Nov 23, 2009 12:46 am

I've already solved this, but thought I'd write about it in case it affected anyone else.

I implemented an ADC conversion during sleep, but the device (12F675) never woke up. Same thing with a 16F877A. It seemed the analog interrupt was not going off.

After several hours, I finally figured out the problem was that the Peripheral Interrupt Enable (PEIE) was not set. In fact, it wasn't being set anywhere.

It's probably a bug in the compiler (v4.095). I would have expected the peripheral interrupts to be enabled as a matter of course, or at least as part of enabling interrupts for a peripheral. In any case, once I manually enabled the PEIE myself, the analog conversion worked perfectly.
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Andrew

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

See this post regarding the PEIE bit:
http://www.ccsinfo.com/forum/viewtopic.php?t=28158&start=8

andrewg · Posted: Mon Nov 23, 2009 3:16 am

Thanks. I like your idea of a new #define for enable/disable_interrupts().
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Andrew