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Thread: Bit banging Asynchronous Serial Communication
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face BY : Stephen B Webb email (remove spam text)



> 1)For the Rx algorithm, what is the best was to watch for the Start Byte?
> Is it best to use an interrupt or to keep polling the line for a
> transition.

If you can do it, I would let the interrupt on RB0 do the hard part for
you.  Polling would work, but seems less flexible.

> 2) Once you think the start byte is coming, what is the best way to be
> sure.  ie, do you look for a pulse that is equal to 1/baud rate? or do you
> assume that any transition is the beginning of the Start Byte?


Wait for 1/2 bit period, and sample a few times, if the line is still low,
then it's a start bit...


Advice:  Buy the Serial Pic'n book.

-Steve

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