#define LATCH_BIT 0 //white
#define CLOCK_BIT 1 //yellow
#define DATA_BIT 2
#define LATCH_PIN A0
#define CLOCK_PIN A1
#define DATA_PIN A2

#define FIXED_TIME 0
void initPins();

void sendButtons();
void setup()
{
    initPins();
    disableTimers();
    noInterrupts();
}

#define readLatch() ((PINC & (1 << LATCH_BIT)) ? HIGH : LOW )
#define readClock() ((PINC & (1 << CLOCK_BIT)) ? HIGH : LOW )
#define sendButtonState(btns) PORTC = (PORTC & (~(1<<DATA_BIT))) | ((btns & 1) << DATA_BIT); btns = (btns >> 1)

#define waitForClockCycle()  while(readClock() == HIGH);while(readClock() == LOW)

void loop()
{
  if(readLatch() != HIGH) {
      return;
  }

  unsigned int pind = B11111100;
  unsigned int pinb = B00111011;
  //unsigned int left = B00000010;
  //unsigned int right = B00000001;
  unsigned int buttonsLow = pind >> 2;
  unsigned int buttonsHigh = pinb & B00111111;

  while( readLatch() == HIGH);


    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsLow);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    sendButtonState(buttonsHigh);
    waitForClockCycle();
    PORTC |= (1<<DATA_BIT);

}

void initPins() {
    pinMode(LATCH_PIN, INPUT);
    pinMode(CLOCK_PIN, INPUT);
    pinMode(DATA_PIN, OUTPUT);
    digitalWrite(DATA_PIN, LOW);

}

void disableTimers() {
    TCCR0A = 0;
    TCCR0B = 0;
    TCCR1A = 0;
    TCCR1B = 0;
    TCCR2A = 0;
    TCCR2B = 0;

}