[jack_umidi] baud rate when writing MIDI messages from USB to jack_umidi

[Marcel Bonnet]

On Wed, 29 May 2019 at 11:27, Hans Petter Selasky <hps at selasky.org> wrote:

> On 2019-05-29 16:15, Marcel Bonnet wrote:
> > Hello.
> >
> > I'm making a MIDI controller with Arduino UNO and I though somebody could
> > help me on clarify if I should set a specific baud rate when writing MIDI
> > messages from Arduino (from USB port) that are target to jack_umidi.
> >
> > I realize that whem I'm writing chars (debug messages) they are
> interpreted
> > as random MIDI notes. But when I turn debug off and write something like:
> >
> >        Serial.write(0x90);
> >        Serial.write(0x30);
> >        Serial.write(0x7F);
> >        Serial.flush();
> >
> > no MIDI message is received (I used jack_midi_dump to check, it is
> empty) .
> >
> > So I'm not asking about Arduino itself, but maybe it is something related
> > to the baud rate?
> >
>
> The USB protocol use a classification byte. Every USB MIDI command is
> always 4-bytes long.
>
> Regular MIDI is using 64000 baud I think.
>
> --HPS
>
>
Thanks a lot HPS!

BTW, I looked at
http://www.gweep.net/~prefect/eng/reference/protocol/midispec.html : it
states 31250 baud for MIDI.

I'm opening the arduino USB device as:
$ jack_umidi -S -B -C /dev/cuaU0

In this case, 9600 baud is too slow? Should I set to 31250 next time?

Thanks in advance,

-- 
Marcel Bonnet