[Bug] MIDI data not received by keyboard

[samesimilar]

Describe the Bug

I have enabled MIDI in my firmware build, and I can successfully send MIDI from my keyboard over USB to my computer.
I also expect to be able to send MIDI from my computer to the keyboard.

• The keyboard shows up as a MIDI output device on my computer
• I have registered MIDI callbacks for receiving data.
• MIDI_ENABLE = yes in my rules.mk

Observed:
The callback function usb_get_midi never receives MIDI data from the recv_midi_packet function.

Keyboard Used

wilba_tech/rama_works_m50_a

Link to product page (if applicable)

No response

Operating System

macOS 12.5.1

qmk doctor Output

No response

Is AutoHotKey / Karabiner installed

• AutoHotKey (Windows)
• Karabiner (macOS)

Other keyboard-related software installed

No response

Additional Context

I was able to resolve the bug for myself by changing the following line in tmk_core/protocol/lufa/lufa.c from:

ConfigSuccess &= Endpoint_ConfigureEndpoint((MIDI_STREAM_OUT_EPNUM | ENDPOINT_DIR_IN), EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);

to:

ConfigSuccess &= Endpoint_ConfigureEndpoint((MIDI_STREAM_OUT_EPNUM | ENDPOINT_DIR_OUT), EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);

It seems to me that the incorrect ENDPOINT direction was selected in this configuration in the upstream codebase. Changing it makes MIDI input work and I can now process MIDI on the keyboard. But I am not sure if the original configuration was intentional or a bug, so I wanted to share it in case someone else has the same problem as me!

[zvecr]

Already fixed by #18654

[qiji102]

I am currently able to send MIDI information from the keyboard to the computer, but now I want to send data from the computer to the keyboard to control RGB lights. The documentation for MIDI reception in QMK is insufficient, and I would like to know how to implement the code for receiving and processing MIDI data.

[nezumee]

I am currently able to send MIDI information from the keyboard to the computer, but now I want to send data from the computer to the keyboard to control RGB lights.

You can try something like https://github.com/nezumee/qmk_firmware/tree/4x4/keyboards/4x4/keymaps/midi-controller (code is a bit old, hopefully it still works). The code for processing midi events is in midi-feedback.c, setting RGB LEDs is in rgb_matrix_user.inc.