Basic example of using Adafruit Featherwing MIDI with a Feather RP2040 board

featherwing_midi.ino

#include <MIDI.h>
#include <HardwareSerial.h>
struct MIDISettings : public midi::DefaultSettings
{
  static const long BaudRate = 31250;
};
MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, MIDI, MIDISettings);

void setup()
{
  MIDI.begin(MIDI_CHANNEL_OMNI); // Listen on any channel
}

void loop()
{
  MIDI.sendNoteOn(42, 127, 1);    // Send a Note (pitch 42, velo 127 on channel 1)
  delay(1000);		            // Wait for a second
  MIDI.sendNoteOff(42, 0, 1);     // Stop the note
  delay(1000);		            // Wait for a second
}