98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
#include <MIDI.h>
|
|
#include "noteList.h"
|
|
#include "pitches.h"
|
|
|
|
MIDI_CREATE_DEFAULT_INSTANCE();
|
|
|
|
#ifdef ARDUINO_SAM_DUE // Due has no tone function (yet), overriden to prevent build errors.
|
|
#define tone(...)
|
|
#define noTone(...)
|
|
#endif
|
|
|
|
// This example shows how to make a simple synth out of an Arduino, using the
|
|
// tone() function. It also outputs a gate signal for controlling external
|
|
// analog synth components (like envelopes).
|
|
|
|
static const unsigned sGatePin = 13;
|
|
static const unsigned sAudioOutPin = 10;
|
|
static const unsigned sMaxNumNotes = 16;
|
|
MidiNoteList<sMaxNumNotes> midiNotes;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
inline void handleGateChanged(bool inGateActive)
|
|
{
|
|
digitalWrite(sGatePin, inGateActive ? HIGH : LOW);
|
|
}
|
|
|
|
inline void pulseGate()
|
|
{
|
|
handleGateChanged(false);
|
|
delay(1);
|
|
handleGateChanged(true);
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
void handleNotesChanged(bool isFirstNote = false)
|
|
{
|
|
if (midiNotes.empty())
|
|
{
|
|
handleGateChanged(false);
|
|
noTone(sAudioOutPin); // Remove to keep oscillator running during envelope release.
|
|
}
|
|
else
|
|
{
|
|
// Possible playing modes:
|
|
// Mono Low: use midiNotes.getLow
|
|
// Mono High: use midiNotes.getHigh
|
|
// Mono Last: use midiNotes.getLast
|
|
|
|
byte currentNote = 0;
|
|
if (midiNotes.getLast(currentNote))
|
|
{
|
|
tone(sAudioOutPin, sNotePitches[currentNote]);
|
|
|
|
if (isFirstNote)
|
|
{
|
|
handleGateChanged(true);
|
|
}
|
|
else
|
|
{
|
|
pulseGate(); // Retrigger envelopes. Remove for legato effect.
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
void handleNoteOn(byte inChannel, byte inNote, byte inVelocity)
|
|
{
|
|
const bool firstNote = midiNotes.empty();
|
|
midiNotes.add(MidiNote(inNote, inVelocity));
|
|
handleNotesChanged(firstNote);
|
|
}
|
|
|
|
void handleNoteOff(byte inChannel, byte inNote, byte inVelocity)
|
|
{
|
|
midiNotes.remove(inNote);
|
|
handleNotesChanged();
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
void setup()
|
|
{
|
|
pinMode(sGatePin, OUTPUT);
|
|
pinMode(sAudioOutPin, OUTPUT);
|
|
MIDI.setHandleNoteOn(handleNoteOn);
|
|
MIDI.setHandleNoteOff(handleNoteOff);
|
|
MIDI.begin();
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
MIDI.read();
|
|
}
|