>
>
>> Thanks for all of your help! I see now that my mistake was
>> interpreting "empty" as meaning "cleared."
>>
>> Is there any reason to wait to write until TRMT is set as opposed to
>> TXIF?
>
> You would normally wait for TXIF. You would only use TRMT if you needed t=
o
> know that all the data had gone out the wire, perhaps before turning
> around
> a line driver or something.

I usually watch TXIF, but have watched TRMT for transmitting DMX-512 where
I need to know that last byte went out before sending a break (this on
PICs where the UART does not know how to do a break, so I do it with
external hardware). It would be nice if there were an interrupt on TRMT,
but I got around it by using a timer interrupt.

Harold


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