const int SER   = 8; // DATA
const int LATCH = 9; // RCLK or sr1:STCP
const int CLK   = 10;

byte leds = B10101010;

long test_sum(long a, long b) {
  return a + b;
}

void setup() {
  Serial.begin(115200);
  int pins[3] = {
    [0] = SER,
    [1] = LATCH,
    [2] = CLK
  };

  for (int i = 0; i < 3; i++) {
    pinMode(pins[i], OUTPUT);
  }

  unsigned char *p = 0x0100;

  Serial.println(*p);

}

void loop() {
  digitalWrite(LATCH, LOW);
  shiftOut(SER, CLK, MSBFIRST, leds);
  digitalWrite(LATCH, HIGH);
  Serial.println(leds, BIN);
  //leds =~ leds;
  delay(1000);
  long v = test_sum(3, 4);
  leds = (byte)(random(0, 0xFF));
}