Tips & Tricks

[franky47]

If you find clever ways of doing things, in code or in solder, post them here !

[lathoub]

You can use lambda/anonymous functions for the callbacks? Here is how:

MIDI.setHandleNoteOff([](byte channel, byte note, byte velocity) {
  Serial.println("NoteOff")
});

lambda/anonymous functions do not use more (or less) RAM than using regular C-style callbacks. [a] uses the exact same amount of RAM as [b] and do not run faster or slower. The main advantage IMHO is reduces c++ function decoration and thus less verbose.

[a]

#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

void setup()
{
  MIDI.setHandleNoteOn([](byte channel, byte note, byte velocity) {
    Serial.println("NoteOn");
  });
  MIDI.setHandleNoteOff([](byte channel, byte note, byte velocity) {
    Serial.println("NoteOff");
  });

  MIDI.begin(MIDI_CHANNEL_OMNI);
}

void loop()
{
  MIDI.read();
}

[b]

#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

void handleNoteOn(byte channel, byte pitch, byte velocity)
{
  Serial.println("NoteOn");
}

void handleNoteOff(byte channel, byte pitch, byte velocity)
{
  Serial.println("NoteOff");
}

void setup()
{
  MIDI.setHandleNoteOn(handleNoteOn);  // Put only the name of the function
  MIDI.setHandleNoteOff(handleNoteOff);

  MIDI.begin(MIDI_CHANNEL_OMNI);
}

void loop()
{
  MIDI.read();
}