Date: Wed, 29 May 2019 22:58:09 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Marcel Bonnet <marcelbonnet@gmail.com> Cc: FreeBSD multimedia <freebsd-multimedia@freebsd.org>, multimedia@freebsd.org Subject: Re: [jack_umidi] baud rate when writing MIDI messages from USB to jack_umidi Message-ID: <b994d84b-3da2-a8bf-bd72-44add15d0857@selasky.org> In-Reply-To: <CAPe0dBmLHavci2q2sCVc9zPRXprLjtoujXM8GOheFk8Ns2kfJQ@mail.gmail.com> References: <CAPe0dBmmLU8_umJYK9kRwukbc_GeHwuYfJLawP6=nB3gHyJMfA@mail.gmail.com> <3dc15748-39c2-49fe-f423-46d42a4b58d4@selasky.org> <CAPe0dBmLHavci2q2sCVc9zPRXprLjtoujXM8GOheFk8Ns2kfJQ@mail.gmail.com>
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On 2019-05-29 16:52, Marcel Bonnet wrote: > On Wed, 29 May 2019 at 11:27, Hans Petter Selasky <hps@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, > I've never tested jack_umidi like this :-) Maybe you'll need to patch it to set the baud rate. --HPS
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