Josh Koffman wrote:

>Ok, since I can't seem to find anyone that's really done exactly what I
>want to do, I seem to be forging new ground. Unfortunately, I'm not that
>great at it, so I have a few questions. I plan on using one of the
>little IR modules to decode the actual IR signal and give me a ttl out.
>The question now is, what's the best way to deal with it?  I'd like to
>stay away from just polling, because the PIC will be doing a bunch of
>other things, and I don't want to run the risk of missing IR pulses.
>
missing IR pulses?  Most modules produce TTL at about 1200 baud MAX!
(think about how many macine cycles happen during 1 "pulse" at 1200 baud.)

> I could use the external interrupt, so that every time there is a pulse
>I'd check a TMR. The problem I see there is that I have to set the
>interrupt to trigger on rising edge or falling edge, I can't do both. I
>don't want to mess with portB interrupt on change. I was thinking I
>could use the CCP module, but I don't really know how. I guess it would
>trigger when it receives a pulse from the IR module, then captures the
>value in the TMR. Then I could check the value of that against what my
>high and low timings should be, and go from there. Again I think I run
>into the rising/falling edge thing though. I'm really confused here. I'm
>sure that there is a solution somewhere, I just can't quite figure it
>out.
>
>If you have any ideas or suggestions, they will be appreciated!
>
>Thanks,
>
>Josh
>--
>A common mistake that people make when trying to design something
>completely foolproof is to underestimate the ingenuity of complete
>fools.
>        -Douglas Adams
>
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>
>

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  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
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