MIDI to YMZ294(SPI)

mtys.ino

#include <SPI.h>
#include <MIDI.h> // http://playground.arduino.cc/Main/MIDILibrary

#define SS   10
#define A0    9

int tone1Interval = 0;
int tone2Interval = 0;
int tone3Interval = 0;

MIDI_CREATE_DEFAULT_INSTANCE();

int  m2t[128] = {
8,9,9,10,10,11,12,12,13,14,15,15,16,17,18,19,21,22,23,25,26,28,29,31,
33,35,37,39,41,44,46,49,52,55,58,62,65,69,73,78,82,87,93,98,104,110,117,
124,131,139,147,156,165,175,185,196,208,220,233,247,262,277,294,311,330,
349,370,392,415,440,466,494,523,554,587,622,659,699,740,784,831,880,932,
988,1047,1109,1175,1245,1319,1397,1480,1568,1661,1760,1865,1976,2093,
2218,2349,2489,2637,2794,2960,3136,3322,3520,3729,3951,4186,4435,4699,
4978,5274,5588,5920,6272,6645,7040,7459,7902,8372,8870,9397,9956,10548,
11175,11840,12544,};

void set_register(byte addr, byte data){
  digitalWrite(A0, LOW);
  digitalWrite(SS, LOW);
  SPI.transfer(addr);
  digitalWrite(SS, HIGH);
  delayMicroseconds(50);

  digitalWrite(A0, HIGH);
  digitalWrite(SS, LOW);
  SPI.transfer(data);
  digitalWrite(SS, HIGH);
  delayMicroseconds(50);
}

void reset() {
  set_register(0x00, 0);
  set_register(0x01, 0);
  set_register(0x02, 0);
  set_register(0x03, 0);
  set_register(0x04, 0);
  set_register(0x05, 0);
  set_register(0x06, 0);
  set_register(0x07, 0);
  set_register(0x08, 0);
  set_register(0x09, 0);
  set_register(0x0a, 0);
  set_register(0x0b, 0);
  set_register(0x0c, 0);
  set_register(0x0d, 0);
  
}

void SetFrequency(byte ch, word freq, byte vol) {
  word cal_freqency = 0;
  if (freq != 0) {
    cal_freqency = 125000 / freq;
  }
  cal_freqency &= 0b0000111111111111;
  set_register(0x00 + (ch * 2), cal_freqency & 0xff);
  set_register(0x01 + (ch * 2), (cal_freqency >> 8) & 0xff);
  set_register(0x08 + ch, vol);
}

void setup() {
  pinMode(SS,   OUTPUT);
  pinMode(A0,   OUTPUT);

  SPI.setBitOrder(MSBFIRST);
  SPI.setClockDivider(SPI_CLOCK_DIV4);
  SPI.setDataMode(SPI_MODE2);
  SPI.begin();
  MIDI.begin();
  Serial.begin(115200);
  delay(1000);

  reset();
  
  set_register(0x07, 0b00111000);
  SetFrequency(0, 0, 0);
  SetFrequency(1, 0, 0);
  SetFrequency(2, 0, 0);
}

void loop()
{
  uint8_t code;
  uint8_t ch,data1,data2;
  ch = 1;         //Read channel set;
  if (MIDI.read()) {
    MIDI.setInputChannel(ch);  // Channel
    
    switch(MIDI.getType()) {
      case midi::NoteOn:
        data1 = MIDI.getData1();    // note no
        data2 = MIDI.getData2();    // velocity
        if(data2 == 0){
        } else if(tone1Interval == 0){
          tone1Interval = data1;
          SetFrequency(0, m2t[data1], 15);
        } else if(tone2Interval == 0){
          tone2Interval = data1;
          SetFrequency(1, m2t[data1], 15);
        } else if(tone3Interval == 0){
          tone3Interval = data1;
          SetFrequency(2, m2t[data1], 15);
        }
        break;
      case midi::NoteOff:
        data1 = MIDI.getData1();       // note no
        if(tone1Interval == data1){
          tone1Interval = 0;
          SetFrequency(0, 0, 0);
        }
        if(tone2Interval == data1){
          tone2Interval = 0;
          SetFrequency(1, 0, 0);
        }
        if(tone3Interval == data1){
          tone3Interval = 0;
          SetFrequency(2, 0, 0);
        }
        break;
      case midi::PitchBend:
        data2 = MIDI.getData2();
        if(tone1Interval != 0){
          int tmp = tone1Interval + 19 + data2;
          SetFrequency(0, tmp, 15);
        }
        if(tone2Interval != 0){
          int tmp = tone2Interval + 19 + data2;
          SetFrequency(1, tmp, 15);
        }
        if(tone3Interval != 0){
          int tmp = tone3Interval + 19 + data2;
          SetFrequency(2, tmp, 15);
        }
        break;
      default:
        break;
    }
  }
  
}