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