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How can I SEND midi commands from within Simulink?

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Hi, how can I send MIDI commands from simulink simulation to a MIDI device?
I have no problem doing this in matlab to the target device but I can't seem to figure out how to properly call the commands for midisend, midimsg, etc. from simulink at all.
I basically want functionality that is reverse of the simulink block called "Midi Control" (this existing block reads in signals from external midi devices into Simulink. I want to SEND midi messages based on what happens in a simulink simulation).
Thanks,
Joel

Accepted Answer

Charlie DeVane
Charlie DeVane on 7 Jan 2020
Hi Joel,
You can use either the Interpreted MATLAB Function block or the MATLAB Function block to call the MATLAB MIDI functions. I have attached a simple example model using both blocks to send a counter value to move sliders on my BCF2000. The Interpreted MATLAB Function requires a MATLAB file separate from the model, whereas the MATLAB Function block has the advantage of incorporating this code directly into the model.
The Interpreted MATLAB Function block calls the following function (place it in the same folder with the model).
function sendMidiMsg(cval)
persistent md
if isempty(md)
md = mididevice('BCF2000');
end
channel = 1;
control = 82;
midisend(md, 'ControlChange', channel, control, cval);
end
The code inside the MATLAB Function block is similar, but requires coder.extrinsic (because the MIDI functions don't support codegen) and uses a different control number (to control a different slider on the BCF2000).
function sendMidiMsg(cval)
coder.extrinsic('mididevice', 'midisend');
persistent md
if isempty(md)
md = mididevice('BCF2000');
end
channel = 1;
control = 81;
midisend(md, 'ControlChange', channel, control, cval);
end
hth,
Charlie
  3 Comments
Charlie DeVane
Charlie DeVane on 24 Aug 2020
The MIDI instrument receiving your messages is using a piano patch. Send "ProgramChange" messages with different patch numbers to get different sounds.
The sound you get from a given patch number depends on the specific MIDI instrument. If it conforms to the "General MIDI v1 spec", you'll get the sounds described at https://www.midi.org/specifications-old/item/gm-level-1-sound-set.
This question is really about MIDI, and not about MATLAB or Simulink. I recommend the tutorials and other information linked at https://www.midi.org/specifications for authoritative answers.

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More Answers (1)

Mark McBroom
Mark McBroom on 4 Jan 2020
The audio toolbox comes with Simulink blocks for midi send/receive.
Otherwise you will have to create custom block via:
  1. custom s-function
  2. MATLAB Function Block with coder.extrinsic() for midi functions
  3. MATLAB Function block with coder.ceval() to external midi APIs
  3 Comments
Joel Gouker
Joel Gouker on 6 Jan 2020
Hi Mark. Yes. I need to send MIDI commands often. The MIDI values/control commands are being generated by the Simulink Model during the simulation - these MIDI commands need to be sent approximately every 10-60 seconds to the external MIDI device.

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