/* NanoSync

MIDI Clock --> Nanoloop 1.x sync

by Sebastian Tomczak
May 2008

*/



// Serial Variables
int baud = 31250;


// MIDI Real Time Bytes
byte midi_start = 0xfa;
byte midi_stop = 0xfc;
byte midi_clock = 0xf8;


// Working Variables and Pins
int nano_flip = 0;
int nano_pin = 2;
int play_flag = 0;
byte data;


// Setup
void setup() {
  Serial.begin(baud);
  pinMode(nano_pin, OUTPUT);
}


// Program
void loop() {
  if(Serial.available() > 0) {
    data = Serial.read();

    if(data == midi_start) {
      play_flag = 1;
    }

    else if(data == midi_stop) {
      play_flag = 0;
      nano_flip = 0;
    }

    else if((data == midi_clock) && (play_flag == 1)) {
      nanoSync();
    }
  }    
}


// Functions
void nanoSync() {
  if(nano_flip == 0) {
    digitalWrite(nano_pin, LOW);
    nano_flip = 1;
  }
  
  else if(nano_flip == 1) {
    digitalWrite(nano_pin, HIGH);
    nano_flip = 0;
  }
}