Host: MIDI 2.0

Example source: examples/host/midi2_host

A minimal USB host example that receives MIDI from a connected USB-MIDI device and prints it over the debug UART, using the USB-MIDI 2.0 host driver (UMP).

What it does

• Enumerates USB-MIDI devices (CFG_TUH_MIDI2) and, on mount, prints the negotiated protocol (MIDI 1.0 / MIDI 2.0) and the number of RX/TX cables.

• Receives Universal MIDI Packets (UMP) and prints each one, decoding common Channel Voice messages — Note On/Off, Control Change, Program Change, Channel Pressure, Pitch Bend — for both MIDI 2.0 and MIDI 1.0 message types, and falling back to a raw hex dump for anything else.

Requirements

The board must support USB host mode (provide VBUS to the connected device); some boards need an external USB-A port / host adapter.

Configuration

Notable tusb_config.h settings:

#define CFG_TUH_ENABLED             1
#define CFG_TUH_HUB                 1
#define CFG_TUH_DEVICE_MAX          (3*CFG_TUH_HUB + 1)
#define CFG_TUH_MIDI2               CFG_TUH_DEVICE_MAX
#define CFG_TUH_MIDI2_RX_BUFSIZE    512
#define CFG_TUH_MIDI2_TX_BUFSIZE    512

Building

CMake:

mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .

Make:

make BOARD=raspberry_pi_pico all

How to use

Plug a USB-MIDI device (keyboard, controller, or interface) into the board’s USB host port. On attach the debug UART prints the mount/descriptor info; then playing notes or moving controls on the device prints the decoded MIDI messages.