On Sun, Sep 29, 2002 at 04:32:25PM -0500, Nick Veys wrote:
> Hi all, planning on doing a little serial i/o and want to get a good
> idea before writing code that may end up worthless due to a false
> assumption. :)

OK.

>
> I plan on using the 16F876's USART in Asynch mode to talk to a HAM TNC,
> 9600 baud 8N1.  Looking through the datasheet, I see the TRMT bit is set
> once a transmission is complete, is it safe to assume I can being a new
> transmission once that bit is set?  I've used the SPI ports quite often,
> and there is a transmit flag there which I use for the same purpose and
> have no problems, but I'm wondering if since these commands might be
> coming in too fast to be buffered by the slow TNC on the other end, if a
> wait would be warranted after the transmission...
>
> I'm hoping I can just keep firing away on the port but I'd like some
> words of wisdom just in case.

I have a better idea. Take a good read of Fr. Thomas McGahee's PICUART
turorial. It's a highly annotated PIC assembly source file that doubles as
the best PIC UART tutorial around and as a drop in working program that'll
get your USART right as rain.

I cannot recommend the code or the comments highly enough.

I have a copy of Fr. Tom's latest version online. Download here:

http://www.finitesite.com/d3jsys/picuart.zip

BAJ

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