int ROW_LT = 8; //PB0
int ROW_CLK = 9; //PB1
int ROW_IN = 10; //PB2
int COL_LT = 7; //PD7
int COL_CLK = 6; //PD6
int COL_IN = 5; //PD5

byte img[32];
bool updated;

void rowSelect(short input) {
  byte firstHalf = (byte) ((input >> 8) & 255);
  byte secondHalf = (byte) (input & 255);
  shiftOut(COL_IN, COL_CLK, MSBFIRST, secondHalf);
  shiftOut(COL_IN, COL_CLK, MSBFIRST, firstHalf);
}

void colSelect(short input) {
  byte firstHalf = (byte) ((input >> 8) & 255);
  byte secondHalf = (byte) (input & 255);
  shiftOut(ROW_IN, ROW_CLK, MSBFIRST, secondHalf);
  shiftOut(ROW_IN, ROW_CLK, MSBFIRST, firstHalf);
}

void dispOff() {
  digitalWrite(ROW_LT, 0);
  digitalWrite(COL_LT, 0);
}

void dispOn() {
  digitalWrite(ROW_LT, 1);
  digitalWrite(COL_LT, 1);
}

void setup() {
  pinMode(ROW_LT, OUTPUT);
  pinMode(ROW_CLK, OUTPUT);
  pinMode(ROW_IN, OUTPUT);
  pinMode(COL_LT, OUTPUT);
  pinMode(COL_CLK, OUTPUT);
  pinMode(COL_IN, OUTPUT);
  dispOff();
  rowSelect(0);
  colSelect(0);
}

uint64_t start_time;

void loop() {
  start_time = millis();

  while(millis() - start_time < 500){
    for(int i = 0; i < 16; i++){
      dispOff();
      rowSelect(1 << i);
      if (i % 2){
        colSelect(0b1010101010101010);
      }
      else{
        colSelect(0b0101010101010101);
      }
      dispOn();
    }
  }

    start_time = millis();

  while(millis() - start_time < 500){
    for(int i = 0; i < 16; i++){
      dispOff();
      rowSelect(1 << i);
      if (i % 2){
        colSelect(0b0101010101010101);
      }
      else{
        colSelect(0b1010101010101010);
      }
      dispOn();
    }
  }
}