//defining pins for eeprom
int CLOCK =13;
int DATA_OUT =12;
int DATA_IN = 11;
int CHIP_SEL =10;

void setup(){
  pinMode(CLOCK ,OUTPUT);
  pinMode(DATA_OUT ,OUTPUT);
  pinMode(DATA_IN ,INPUT);
  pinMode(CHIP_SEL ,OUTPUT);
  digitalWrite(CHIP_SEL ,LOW);
  Serial.begin(9600);
}
void sendSer(String s){
  digitalWrite(CHIP_SEL,HIGH);
  int len = s.length();

  for (int i=0;i<len;i++){
    char c = s.charAt(i);
    if (c=='0')
      digitalWrite(DATA_OUT, LOW);
    else
      digitalWrite(DATA_OUT, HIGH);
    digitalWrite(CLOCK,HIGH);
    digitalWrite(CLOCK,LOW);
  }
    //needs little delay to work
    delay(10);
}
void recvSer(String s){
  digitalWrite(CHIP_SEL,HIGH);
  int len = s.length();
  for (int i=0;i<len;i++){
    char c = digitalRead(DATA_IN);
    Serial.print(c==LOW ? "0" : "1");
    digitalWrite(CLOCK,HIGH);
    digitalWrite(CLOCK,LOW);
  }
}

void loop(){

  digitalWrite(CHIP_SEL, HIGH);
  sendSer("00000100"); //sending EWEN instruction
  sendSer("1100000"); //
  digitalWrite(CHIP_SEL,LOW);

  digitalWrite(CHIP_SEL, HIGH);
  sendSer("00000101"); //sending WRITE instruction
  sendSer("0000001"); //sending Address
  sendSer("10001101"); //sending data
  digitalWrite(CHIP_SEL,LOW);

  digitalWrite(CHIP_SEL, HIGH);
  sendSer("00000110"); //sending READ instruction
  sendSer("0000001"); //sending Address

  //dummy zero that is sent at start of read
  digitalWrite(CLOCK,HIGH);
  digitalWrite(CLOCK,LOW);

  //receiving data... zeros is just to specify count.
  //no meaning in them... output is to serial
  recvSer("00000000");
  digitalWrite(CHIP_SEL,LOW);

  while(1);
}