Flamingo/FM/FM.ino

#include <MozziGuts.h>
#include <mozzi_midi.h>
#include <Oscil.h> // oscillator 
#include <tables/cos2048_int8.h> // table for Oscils to play
#include <Smooth.h>
#include <AutoMap.h> // maps unpredictable inputs to a range
#include <MIDIUSB.h>
#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

#define CONTROL_RATE 64
#define MIDI_CHANNEL 3

bool gate = 0;
 
// desired carrier frequency max and min, for AutoMap
const int MIN_CARRIER_FREQ = 22;
const int MAX_CARRIER_FREQ = 440;

const int MIN = 10;
const int MAX = 1;

const int MIN_2 = 1;
const int MAX_2 = 15;

// desired intensity max and min, for AutoMap, note they're inverted for reverse dynamics
const int MIN_INTENSITY = 700;
const int MAX_INTENSITY = 10;

// desired mod speed max and min, for AutoMap, note they're inverted for reverse dynamics
const int MIN_MOD_SPEED = 10000;
const int MAX_MOD_SPEED = 1;

AutoMap kMapCarrierFreq(0,1023,MIN_CARRIER_FREQ,MAX_CARRIER_FREQ);
AutoMap kMapIntensity(0,1023,MIN_INTENSITY,MAX_INTENSITY);
AutoMap kMapModSpeed(0,1023,MIN_MOD_SPEED,MAX_MOD_SPEED);
AutoMap mapThis(0,1023,MIN,MAX);
AutoMap mapThisToo(0,1023,MIN_2,MAX_2);

//Mapping the knob pins
const int CONTROLL1 = 0;
const int CONTROLL2 = 1;
const int CONTROLL3 = 2;
const int CONTROLL4 = 3;

Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aCarrier(COS2048_DATA);
Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aModulator(COS2048_DATA);
Oscil<COS2048_NUM_CELLS, CONTROL_RATE> kIntensityMod(COS2048_DATA);

int mod_ratio = 5; // brightness (harmonics)
long fm_intensity; // carries control info from updateControl to updateAudio

// smoothing for intensity to remove clicks on transitions
float smoothness = 0.95f;
Smooth <long> aSmoothIntensity(smoothness);

int carrier_freq = 440;

void noteOn(byte channel, byte note, byte velocity) {
  if (channel == MIDI_CHANNEL) {
    carrier_freq = mtof((int) note);
    gate = 1;
  }
}

void noteOff(byte channel, byte note, byte velocity) {
  if (channel == MIDI_CHANNEL) {
    gate = 0;
  }
}

void setup(){
  pinMode(LED_BUILTIN_TX,INPUT); //switch rx and tx leds of, so they don't blink on midi
  pinMode(LED_BUILTIN_RX,INPUT);

  startMozzi();

  MIDI.setHandleNoteOn(noteOn);
  MIDI.setHandleNoteOff(noteOff);
  MIDI.begin(MIDI_CHANNEL);  
}

void updateControl(){
  midiEventPacket_t rx;
  do {
    rx = MidiUSB.read();
    if (rx.header == 0x09) {
      noteOn(rx.byte1 - 143, rx.byte2, rx.byte3); //need to figure out what's with this 143 and 127 on noteoff
    } else if (rx.header == 0x08) {
      noteOff(rx.byte1 - 127, rx.byte2, rx.byte3);
    }
  } while (rx.header != 0);
    
   int freqVal = mozziAnalogRead(CONTROLL3); // value is 0-1023
   int FRQ = mapThis(freqVal);
   
   int knob2 = mozziAnalogRead(CONTROLL4); // value is 0-1023
   int knob2Val = mapThis(knob2);
  
  //calculate the modulation frequency to stay in ratio
  int mod_freq = carrier_freq * mod_ratio * FRQ;
  
  // set the FM oscillator frequencies
  aCarrier.setFreq(carrier_freq); 
  aModulator.setFreq(mod_freq);
  
  // read the light dependent resistor on the width Analog input pin
  int Knob1value= mozziAnalogRead(CONTROLL1); // value is 0-1023


  int Knob1calibrated = kMapIntensity(Knob1value);

  
 // calculate the fm_intensity
  fm_intensity = ((long)Knob1calibrated * knob2Val * (kIntensityMod.next()+128))>>8; // shift back to range after 8 bit multiply

  
  // read the light dependent resistor on the speed Analog input pin
  int Knob2value= mozziAnalogRead(CONTROLL2); // value is 0-1023

  
  // use a float here for low frequencies
  float mod_speed = (float)kMapModSpeed(Knob2value)/1000;

  kIntensityMod.setFreq(mod_speed);

  MIDI.read();
}


int updateAudio(){
  long modulation = aSmoothIntensity.next(fm_intensity) * aModulator.next();
  if (gate == 1) {
    return aCarrier.phMod(modulation);//(int)(envelope.next() * aCarrier.phMod(modulation))>>8;
  }
}

void loop(){
  audioHook();
}