Using the Pmod JSTK with Arduino Uno

/************************************************************************
*
* Test of the Pmod 
*
*************************************************************************
* Description: Pmod_JSTK
* X and Y values will be shown in serial monitor in a table
* and LEDs LD1 and LD2 will light on when
* BTN1 and BTN2 are pushed.
*
*
* Material
* 1. Arduino Uno
* 2. Pmod JSTK
*
************************************************************************/

#define CS 10 // affectation of CS pin
#include <SPI.h> // Include library
int i;
byte recu[6]; // store data from module
int X;
int Y;
int led=128;
void setup()
{
 Serial.begin(9600); // initialization of the serial communication
 SPI.begin(); // initialization of SPI port
 SPI.setDataMode(SPI_MODE0); // configuration SPI link in mode 0
 SPI.setClockDivider(SPI_CLOCK_DIV16); // configuration of clock at 1MHz
 pinMode(10, OUTPUT);
}

void loop()
{
 digitalWrite(CS, LOW); // activation of CS line
 delayMicroseconds(15); // see doc: wait 15μs after activation of CS line
 for (i=0;i<5;i=i+1)
    {
    recu[i] = SPI.transfer(led); // Send 5 data to get data from module (LEDs are off)
    delayMicroseconds(10); // see doc: wait 10μs after each send
    }
digitalWrite(CS, HIGH); // deactivation of CS line
X = recu[0]; // X has a 10-bit format
X |= (recu[1] << 8);
Y = recu[2]; // Y has a 10-bit format
Y |= (recu[3] << 8);
for (i=0;i<5;i=i+1) // write in serial monitor
   {
   Serial.print("i");
   Serial.print(i);
   Serial.print("=");
   Serial.print(recu[i]);
   Serial.print('\t'); // tabulation
   }
Serial.print("X=");
Serial.print(X);
Serial.print('\t'); // tabulation
Serial.print("Y=");
Serial.println(Y);
delay(10);
switch (recu[4])
{
case 2: // BTN1 working
 led=129;
 break;
case 4: // BTN2 working
 led=130;
 break;
case 6: // BTN1 and BTN2 working
 led=131;
 break;
default:
 led=128;
break;
 }
}