#include <SPI.h>

//  SPI Pins 
int SS = 12 ; // Active Low Slave Select
int SCLK = 11 ; // SPI Clock Signal
int DATA = 10 ; // SPI Data Line (Master Out Slave In)
int led = 13;

// received  value
byte received[] = {0, 0};

void setup() 
{
  // Define D12 , D11 , D10 as Input (SS' CLK MOSI) for software SPI
  pinMode(SS,INPUT);
  pinMode(SCLK,INPUT);
  pinMode(DATA,INPUT);
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW ) ;
}

void loop() 
{    
           
 // Master have selected me and initiated SPI communication
  if( digitalRead(SS) == LOW )
  {  
      listen();
      
      // If the received byte is hexadecimal 0xEEFF, the LED at pin 13 should go on.
         if ((received[0] == byte(0xEE)) && (received[1] == byte(0xFF))) {  
             digitalWrite(led, HIGH);
            
           }
         else if ((received[0] == byte(0x10)) && (received[1] == byte(0x01)))
                  digitalWrite(led, LOW);
         
  }
  
}

void listen()
{
  byte temp;
  int i = 0, j = 0;
    temp = 0;
    for( i = 0 ; i < 2 ; i++)
  {

    // the clock did not start yet so wait
    while( (digitalRead(SCLK) == HIGH) ) ;
    for(j = 0 ; j < 8 ; j++)
    {
      temp <<= 1; temp &= 0xFE;

      //Clock is low , wait
      while( digitalRead(SCLK) == LOW) ;

      // clock is High : read data 
      if(digitalRead(DATA) == HIGH) temp |= 0x01;
      while(  digitalRead(SCLK) == HIGH && digitalRead(SS) == LOW ) ;
    }
    received[i] = temp;
   } 
           
}