Grant,

Did you ever publish your Bass Pedal project? Sounds interesting.

I think Dimitri's problem is related to Interrupt Handling but i don't see what the problem would be from the source Dimitri provided. This might mean it's from an indirect mechanism ...

Dimitri,

Guess i would 1st see if interrupts of any kind occuring. If a port pin toggled for each RX Byte and you filter any MIDI Clock and active sensing msg traffic, you could correlate the 3 bytes of a NOTE ON/OFF or CC cmd with port signalling and what was displayed by MIDI OX.

Not seeing this toggling you wouldn't know if the Serial Port Param Init was the problem or if Interrupts Init/Handling was the problem.

So i guess i would write a small program that would read and copy a Port Bit to the RI flag and see if toggling then occured. If not then Interupt Init/Service is the problem, if the toggling occurs then i'd go after the Serial Parameterization and format compatibility electrically and programatically.

If i saw the toggling i'd write the interrupt to echo back to MIDIOX to see that they are correct.

All this being achieved, one would think things were ok.

I do understand how frustrating something this simple can be, but the old rule of breaking it into smallest constituent parts should solve the problem.

regards,
p