USART Bit Time Error

[Darrel Taylor]

Then, I re-added my TMR0 interrupt routine, using DT_INTS 18. It ticks every 60 uS and does about 4 uS of PBP work before returning.

A lot of times, the handlers don't use any "heavy duty" PBP commands. Often just counting, setting a flag or something similar. If it's only using 4us, this may be one of those times.

If none of the PBP system registers are used, you can just change the handlers TYPE to ASM, and leave it as PBP statements, instead of having to convert it to ASM. This eliminates that overhead, (which is pretty large).

I'd like to see the handlers to verify it though.
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[JEC]

Thanks, DT, for the suggestions.

Update: I re-spun the code entirely. Got rid of the interrupts altogether and set up everything to poll the needed register flags.

UART2 works perfectly to capture the MIDI data - all of it - and the numbers generated by Mister-E's baud rate calculator are spot-on.

My main loop is massaging UART2's data and re-transmitting at a different baud rate through EAURT1.

Thanks to all for the input. At some point I may re-visit this program and try using interrupts...