[sdiy] MIDI Inter-message gap

[David J. Hughes]

Hi Colin,

on 28/1/08 15:43, Colin f at colin at colinfraser.com wrote:

> The P3 uses a high-priority interrupt to empty the transmit buffer, so the
> bytes come out 'nut to butt' (nice expression).
> If you are having trouble sending exactly the same data bytes with no gap,
> is it possible your MIDI baud rate may be too high ?

That's something worth checking.

> That could explain a receiving UART coping with bytes sent with a gap
> between them, but not back to back - it might not have time to capture the
> leading edge of a follwing start bit as it is still expecting to be in stop
> bit of the previous byte.

Yes, that seems reasonable.

> Or the fall time of the MIDI data line may be too slow ?
> I'd compare the two serial output streams on a dual channel scope.

Again, a good suggestion.

I should say that this isn't a problem with the vast majority of the synths
I've tested the sequencer against.

This Kenton Pro2000 is the first instrument I've come across that just
doesn't work.

Thanks for the suggestions.

David

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