/* Required to use SPI. */
#include <SPI.h>

/* Libraries to talk to the NRF2401 */
#include "nRF24L01.h"
#include "RF24.h"

/* Sets up the RF24 library a different way
   for the Arduino Mega 2560. */
#if defined(__AVR_ATmega2560__)
  RF24 radio(53,48);
#else
  RF24 radio(9,10);
#endif

/* Defines the structure of the data 
   that will be transmitted. */
struct data {
  byte start;
  byte left;
  byte right;
  byte finish;
};

/* Give a friendly name to the struct */
typedef struct data Packet;

/* Create an instance of the struct. */
Packet myData =  {0, 0, 0, 0};

/* Easy way to set the left and right values. */
void setThrottleData(byte left, byte right){
  myData.left = left;
  myData.right = right;
}

void setup(){
  /* Sets up the NRF library */
  radio.begin();
  
  /* MUST BE OPPOSITE THE RECEIVER!!! */
  radio.openWritingPipe(0xF0F0F0F0E1LL);
  radio.openReadingPipe(1,0xF0F0F0F0D2LL);
  
  /* Set the radio up to transmit. */
  radio.stopListening();
}

/* Hold the test values to send to the receiver. */
byte left = 0x00;
byte right = 0x00;

void loop(){
  /* Increment and decrement for tests */
  setThrottleData(left++,right--);
  
  /* Send the entire packet */
  if(radio.write(&myData, sizeof(Packet)) == false){
    Serial.println("Error sending packet");
  }
}