Host: MIDI Receive

Example source: examples/host/midi_rx

A USB host example that receives MIDI from a connected USB-MIDI device and prints the incoming bytes over the debug UART.

What it does

• Enumerates USB-MIDI devices (CFG_TUH_MIDI) and, on mount, prints the interface index, device address, and the number of RX/TX cables.

• On each received MIDI packet, reads the stream and prints the cable number followed by the raw MIDI bytes as hex.

• Blinks the board LED once per second.

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_MIDI                CFG_TUH_DEVICE_MAX

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 info; then playing notes or moving controls prints lines like Cable 0 rx: 90 3C 7F with the raw MIDI bytes.