#include <wiringPi.h>
#include <stdio.h>
#define LATCH_PIN 2
#define CLOCK_PIN 0
#define DATA_PIN 3
const int zeroes[] =   {0, 0, 0, 0, 0, 0, 0, 0};
const int ones[] =     {1, 1, 1, 1, 1, 1, 1, 1};
const int checker1[] = {0, 1, 0, 1, 0, 1, 0, 1};
const int checker2[] = {1, 0, 1, 0, 1, 0, 1, 0};
void dWrite(int i, int j){
  delay(10);
  digitalWrite(i, j);
}
void ssend() {
  dWrite (LATCH_PIN, HIGH);
  dWrite (LATCH_PIN, LOW);
}
void write(int mode){
  printf("Writing: (%d)\n", mode);
  dWrite(DATA_PIN, mode);
  dWrite(CLOCK_PIN, HIGH);
  dWrite(CLOCK_PIN, LOW);
  dWrite(DATA_PIN, LOW);
}
void writeLine(const int modes[8]) {
  for(int i = 0; i < 8; i++) {
    write(modes[i]);
    //write(1);
  }
}
void cclear() {
  writeLine(zeroes);
  ssend();
}
int main (void) {
  wiringPiSetup ();
  pinMode (DATA_PIN, OUTPUT);
  pinMode (CLOCK_PIN, OUTPUT);
  pinMode (LATCH_PIN, OUTPUT);
  for (;;) {
    writeLine(checker1);
    ssend();
    writeLine(checker2);
    ssend();
  }
  return 0 ;
}