// Driving 8x8 matrix by 2x 74hc595
// https://forum.arduino.cc/t/driving-8x8-matrix-by-2x-74hc595-code-explained/1402939
//The dot-matrix will display 0 to F circularly

const int latchPin = 8;//Pin connected to ST_CP of 74HC595
const int clockPin = 12;//Pin connected to SH_CP of 74HC595
const int dataPin = 11; //Pin connected to DS of 74HC595
int data[] = { // 17 elements
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //" ",0/
  0xFF, 0xC1, 0xBE, 0xBE, 0xBE, 0xC1, 0xFF, 0xFF, //*"0",1/
  0xFF, 0xDF, 0xDF, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, //*"1",2/
  0xFF, 0xDC, 0xBC, 0xBA, 0xB6, 0xCE, 0xFF, 0xFF, //*"2",3/
  0xFF, 0xDD, 0xBE, 0xB6, 0xB6, 0xC9, 0xFF, 0xFF, //*"3",4/
  0xFB, 0xF3, 0xEB, 0xDB, 0x80, 0xFB, 0xFF, 0xFF, //*"4",5/
  0xFF, 0x8D, 0xAE, 0xAE, 0xAE, 0xB1, 0xFF, 0xFF, //*"5",6/
  0xFF, 0xC1, 0x96, 0xB6, 0xB6, 0xD9, 0xFF, 0xFF, //*"6",7/
  0xFF, 0xBF, 0xBC, 0xB3, 0xAF, 0x9F, 0xFF, 0xFF, //*"7",8/
  0xFF, 0xC9, 0xB6, 0xB6, 0xB6, 0xC9, 0xFF, 0xFF, //*"8",9/
  0xFF, 0xCD, 0xB6, 0xB6, 0xB4, 0xC1, 0xFF, 0xFF, //*"9",10/
  0xFC, 0xF3, 0xCB, 0x9B, 0xEB, 0xF3, 0xFC, 0xFF, //*"A",11/
  0xFF, 0x80, 0xB6, 0xB6, 0xB6, 0xB6, 0xC9, 0xFF, //*"B",12/
  0xFF, 0xE3, 0xDD, 0xBE, 0xBE, 0xBE, 0xBE, 0xDD, //*"C",13/
  0xFF, 0x80, 0xBE, 0xBE, 0xBE, 0xBE, 0xDD, 0xE3, //*"D",14/
  0xFF, 0x80, 0xB6, 0xB6, 0xB6, 0xB6, 0xBE, 0xFF, //*"E",15/
  0xFF, 0x80, 0xB7, 0xB7, 0xB7, 0xB7, 0xBF, 0xFF, //*"F",16/
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //*" ",17/
};

void setup () {
  //set pins to output
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
}

void loop() {
  for (int n = 0; n < 136; n++) // 17*8=136
  {
    for (int t = 0; t < 10; t ++) //Show repeated 10 times
    {
      int dat = 0x01;
      for (int num = n; num < 8 + n; num++)
      {
        shiftOut(dataPin, clockPin, MSBFIRST, ~data[num]); //control ROW of dot matrix
        shiftOut(dataPin, clockPin, MSBFIRST, ~dat); //control COL of dot matrix
        //return the latch pin high to signal chip that it
        //no longer needs to listen for information
        digitalWrite(latchPin, HIGH); //pull the latchPin to save the data
        //delay(1); //wait for a microsecond
        digitalWrite(latchPin, LOW); //ground latchPin and hold low for as long as you are transmitting
        dat = dat << 1;
        delay(1); //wait for a microsecond
      }
    }
  }
}