// The 74HC595 uses a type of serial connection called SPI
// (Serial Peripheral Interface) that requires three pins:
int datapin = 5; 
int clockpin = 6;
int latchpin = 7;
// We'll also declare a global variable for the data we're
// sending to the shift register:
byte data = 0;

//Pins connected to 74HC165
const int dataPinIn = 2;   /* Q7 */
const int clockPinIn = 3;  /* CP */
const int latchPinIn = 4;  /* PL */

const int numBits = 8;   /* Set to 8 * number of shift registers */


void setup() {

  Serial.begin(115200);


   //74HC595 Set the three SPI pins to be outputs:
  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);  
  pinMode(latchpin, OUTPUT);

  //74HC165
  pinMode(dataPinIn, INPUT);
  pinMode(clockPinIn, OUTPUT);
  pinMode(latchPinIn, OUTPUT);
}

void shiftWrite(int desiredPin, boolean desiredState){

// This function lets you make the shift register outputs
// HIGH or LOW in exactly the same way that you use digitalWrite().

  bitWrite(data,desiredPin,desiredState); //Change desired bit to 0 or 1 in "data"

  // Now we'll actually send that data to the shift register.
  // The shiftOut() function does all the hard work of
  // manipulating the data and clock pins to move the data
  // into the shift register:

  shiftOut(datapin, clockpin, MSBFIRST, data); //Send "data" to the shift register

  //Toggle the latchPin to make "data" appear at the outputs
  digitalWrite(latchpin, HIGH); 
  digitalWrite(latchpin, LOW); 
}

byte shiftRead(uint8_t i){
  //set the shift register in the Sampling state
  //reads the inputs from pins D0…D7 and stores them
  digitalWrite(latchPinIn, LOW);
  digitalWrite(latchPinIn , HIGH);
      
  digitalWrite(clockPinIn,HIGH);
  byte incoming = shiftIn(dataPinIn, clockPinIn, MSBFIRST);
  return bitRead(incoming, i);
}

void loop() {
  
  //turn on each led in loop
  for(int i=0; i< 8; i++){
    
    //turn on the led i (595 OUTPUT)
    data = 0; //reset data
    shiftWrite(i, 1); 

    for(int j=0; j<8; j++){
      Serial.print(shiftRead(j));

    }
    Serial.println();


    delay(500);

  }

}