MOZZI USBMIDI Synth

/*  Example of a sound being triggered by MIDI input.

    Demonstrates playing notes with Mozzi in response to MIDI input,
    using  Arduino MIDI library v4.2
    (https://github.com/FortySevenEffects/arduino_midi_library/releases/tag/4.2)

    Circuit:
      MIDI input circuit as per http://arduino.cc/en/Tutorial/Midi
      Note: midi input on rx pin, not tx as in the illustration on the above page.
      Midi has to be disconnected from rx for sketch to upload.
      Audio output on digital pin 9 on a Uno or similar.

        Mozzi documentation/API
        https://sensorium.github.io/Mozzi/doc/html/index.html

        Mozzi help/discussion/announcements:
    https://groups.google.com/forum/#!forum/mozzi-users

    Tim Barrass 2013-14, CC by-nc-sa.
*/

#include <MIDIUSB.h>
#include <MozziGuts.h>
#include <Oscil.h> // oscillator template
#include <tables/sin2048_int8.h> // sine table for oscillator
#include <mozzi_midi.h>
#include <ADSR.h>
#include <Phasor.h>



// use #define for CONTROL_RATE, not a constant
#define CONTROL_RATE 128 // Hz, powers of 2 are most reliable

// audio sinewave oscillator
//Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin(SIN2048_DATA);
//Oscil <2048, CONTROL_RATE> kVib(SIN2048_DATA);
Phasor <AUDIO_RATE> aPhasor1;
Phasor <AUDIO_RATE> aPhasor2;

// envelope generator
ADSR <CONTROL_RATE, AUDIO_RATE> envelope;

#define LED 13 // shows if MIDI is being recieved

void controlChange(byte channel, byte vv, byte velocity) {

}

void noteOn(byte channel, byte pitch, byte velocity) {
//aSin.setFreq(mtof(float(pitch)));
aPhasor1.setFreq(mtof(float(pitch)));
//aPhasor2.setFreq(mtof(float(pitch+.2)));
  envelope.noteOn();
  digitalWrite(LED,HIGH);
}

void noteOff(byte channel, byte pitch, byte velocity) {
  envelope.noteOff();
  digitalWrite(LED,LOW);
}


void setup() {
  pinMode(10,OUTPUT);
  digitalWrite(10,LOW);
  pinMode(LED, OUTPUT);

  // Connect the HandleNoteOn function to the library, so it is called upon reception of a NoteOn.
  //MIDI.setHandleNoteOn(HandleNoteOn);  // Put only the name of the function
  //MIDI.setHandleNoteOff(HandleNoteOff);  // Put only the name of the function
  // Initiate MIDI communications, listen to all channels (not needed with Teensy usbMIDI)
  //MIDI.begin(MIDI_CHANNEL_OMNI);

  envelope.setADLevels(255,70);
  envelope.setTimes(10,50,50,200); // 1000 is so the note will sustain 1 seconds unless a noteOff comes

  //aSin.setFreq(440); // default frequency
  float freq = 55.f;
  aPhasor1.setFreq(freq);
  //aPhasor2.setFreq(freq+0.2f);
  //kVib.setFreq(6.5f);
  startMozzi(CONTROL_RATE);
}


void updateControl(){
  midiEventPacket_t rx = MidiUSB.read();
  switch (rx.header) {
    case 0:
      break; //No pending events

    case 0x9:
      noteOn(rx.byte1 & 0xF,rx.byte2,rx.byte3);
      break;

    case 0x8:
      noteOff(rx.byte1 & 0xF,rx.byte2,rx.byte3);
      break;

    case 0xB:
      controlChange(rx.byte1 & 0xF,rx.byte2,rx.byte3);
      break;
    default:
    break;
  }

  envelope.update();
}


int updateAudio(){
  char asig1 = (char)(aPhasor1.next()>>24);
  //char asig2 = (char)(aPhasor2.next()>>24);
  return ((int)(envelope.next() * asig1)/2);
  //return (int) (envelope.next() * aSin.next())>>8;
}


void loop() {
  audioHook(); // required here
}