/* 
LSDJ Sync Tank
by Sebastian Tomczak
April 2008
*/

byte data = 0;
int switch_pin = 12;
byte portd_on_byte = B11111100;
byte portb_on_byte = B00101111;
byte portc_on_byte = B00111100;


void setup() {
  Serial.begin(31250);
  DDRB = DDRB | B00101111;
  DDRD = DDRD | B11111100;
  DDRC = DDRC | B00111100;
  
  PORTB = B00111111;
  PORTD = B10111100;
  PORTC = B00111100;
  
  pinMode(switch_pin, INPUT); 
  delay(500);
}

void loop () {
  while(digitalRead(switch_pin) == 0) {
  midiSync();
  }
  
  while(digitalRead(switch_pin) == 1) {
  analogSync();
  }
}

void midiSync() {
  if(Serial.available() > 0) {
    data = Serial.read();
    if(data == 0xf8) {
      lsdjClock();
    }
  }
}

void analogSync() {
  lsdjClock();
  delay((analogRead(0) / 26) + 11 );
  delayMicroseconds((analogRead(1) + 1) * 4);
}

void lsdjClock () {
  for (int i=0; i < 8; i++){
    PORTD = B00000000;
    PORTB = B00000000;
    PORTC = B00000000;  
    
    PORTD = portd_on_byte;
    PORTB = portb_on_byte;
    PORTC = portc_on_byte;  
  }
}