This library implements the USB-MIDI transport layer for the FortySevenEffects Arduino MIDI Library and uses the underlying Arduino MIDIUSB library (so only devices working with MIDIUSB, will work here).

Alternative library: see also Adafruit's TinyUSB Library for Arduino for ESP32, mbed_rp2040, ArduinoCore-samd and Pico

This library depends on the Arduino MIDI Library and Arduino's MIDIUSB.

When installing this library from the Arduino IDE, both will be downloaded and installed in the same directory as this library. (Thanks to the depends clause in library.properties)

When manually installing this library, you have to manually download Arduino MIDI Library and MIDIUSB from github and install it in the same directory as this library - without these additional installs, this library will not be able to compile.

#include <USB-MIDI.h>
...
USBMIDI_CREATE_DEFAULT_INSTANCE();
...
void setup()
{
   MIDI.begin(1);
...
void loop()
{
   MIDI.read();

will create a instance named MIDI (transport instance named __usbMIDI) and is by default connected to cable number 0 - and listens to incoming MIDI on channel 1.

#include <USB-MIDI.h>
...
USBMIDI_CREATE_INSTANCE(4);

will create a instance named MIDI (transport instance named __usbMIDI) and is connected to cable number 4.

#include <USB-MIDI.h>
...
USBMIDI_NAMESPACE::usbMidiTransport usbMIDI2(5);
MIDI_NAMESPACE::MidiInterface<USBMIDI_NAMESPACE::usbMidiTransport> MIDI2((USBMIDI_NAMESPACE::usbMidiTransport&)usbMIDI2);

will create a instance named usbMIDI2 (and underlaying MIDI object MIDI2) and is by default connected to cable number 5.

• Arduino Leonardo
• Teensy 4.1 (incl MIDI, MIDIx4 and MIDIx16)

• Arduino NANO 33 BLE
• nRF52832 Bluefruit Feather

The library does not add additional buffers and is extremely efficient and has a small memory footprint.

The libraries below the same calling mechanism (API), making it easy to interchange the transport layer.

• Arduino AppleMIDI Transport
• Arduino ipMIDI Transport
• Arduino BLE-MIDI Transport