John Walshe wrote:
>
> Hi Alan,Mike,
>     Unfortunately I'm already using the HW uart to talk to something else.
> My problem here was with a s/w uart running at 9600
> John

The trouble with software UARTs (bit banged I assume) is that you always
have to be ready to receive a byte 'before' it gets there. If you are
too late then you miss it, or half of it and thus mess up the rest of
your data stream.

You may not afford to have interrupts enabled, because while that is
executing, the receive code may be denied the chance to recognise a
valid start bit. Same with WDT timeouts.

If you are expecting to receive more than one byte, buffer the incoming
data stream then act on it after receiving it all.

Of course, if you have an interrupt enabled (RB0INT for example) to
catch the start bit, then that may make things easier.

Perhaps backtrack a little and only test that your RX routine is
actually grabbing the bytes - echo them back maybe.


--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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