add host midi example (IDFGH-11428)

[Wunderbaeumchen99817]

This new example implements midi functionality with the ESP acting as a usb-host device.

It connects to the connected usb-midi-controller & prints the received signals in the serial monitor.

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[chipweinberger]

+1, this is very useful!

typo: aciton_close_dev

[chipweinberger]

@Wunderbaeumchen99817 , if they don't merge this, you should make a repo called "ESP32 Usb Midi Example".

It would be great for people to google and find it.

[chaabanihoussem]

Hi, how does this works?
so I flashed esp32s3 board and then I couldn't see it as a midi on ubuntu.

what I'm actually trying to do is to build a device that acts as a MIDI host when it's attached to a MIDI device and as MIDI device when it's attached to a MIDI host. The problem I'm trying to solve is that the esp32s3 flashed with MIDI device example now appears when attached to windows/macos/android but doesn't appear when attached to music instrument (korg keyboard).

Any idea will help
Thanks

[roma-jam]

@chaabanihoussem,

In current PR there is a simple MIDI host. So if you are flash it and then attach it to the Ubuntu host - it is not going to work, as you connected two hosts together.

For MIDI device example, which does not appear - which example did you try?

[chaabanihoussem]

@roma-jam thank you getting back

I tried the tusb_midi under examples/peripherals/usb/device and that works fine when connected to a host.

I'm now trying to connect the esp32s3 to a MIDI device and send MIDI cmds to it as
tud_midi_stream_write(cable_num, note_off, 3);
does in the midi device example.

Is there a way the host can send midi cmds to the device?
maybe something like tuh_midi_stream_write(cable_num, note_off, 3); ?

Thanks

[roma-jam]

@chaabanihoussem,

Unfortunately, we don't have MIDI class support.
All supported classes could be found here: https://github.com/espressif/esp-usb/tree/master/host/class

Right at the moment we don't have a plan to implement MIDI host class device, thus if you need MIDI class implementation, it is possible to design it using the class drivers as a reference by the link I have mentioned before.