MIDI Test Code on Arduino and STM32 Blue Pill

This code turns the onboard PC13 LED of the STM32 Blue Pill on when a MIDI NoteOn message is received and turns the LED off when a MIDI Noteoff message is received. It’s my preferred way to confirm that a MIDI circuit is working. It relies on the Arduino MIDI Library.

#include <MIDI.h>

#define LED PC13 // LED pin on Arduino Uno

MIDI_CREATE_DEFAULT_INSTANCE();

void doSomeStuffWithNoteOn(byte channel, byte pitch, byte velocity);
void NoteOff(byte channel, byte note, byte velocity);

void setup()
{
  pinMode(LED, OUTPUT);
  MIDI.begin();
  MIDI.setHandleNoteOn(doSomeStuffWithNoteOn);
  MIDI.setHandleNoteOff(NoteOff);
}

void loop()
{

  MIDI.read();
}

void doSomeStuffWithNoteOn(byte channel, byte pitch, byte velocity)
{
  // note on code goes here
  digitalWrite(PC13, LOW);
}

void NoteOff(byte channel, byte note, byte velocity)
{
  // note off code goes here
  digitalWrite(PC13, HIGH);
}