Arduino Mirf receiver

#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>

struct radio_packet
{
  uint8_t buttons1;
  uint8_t buttons2;
  uint8_t leftX;
  uint8_t leftY;
  uint8_t rightX;
  uint8_t rightY;
}radioData;

uint8_t rx_address[5] = {0xE7, 0xE7, 0xE7, 0xE7, 0xE7};
uint8_t tx_address[5] = {0xD7, 0xD7, 0xD7, 0xD7, 0xD7};


void setup() {
  Serial.begin(115200);

  Serial.println("Setup radio...");

  // put your setup code here, to run once:
  Mirf.spi = &MirfHardwareSpi;

  Mirf.cePin = 5; // PD5 = 5 (was 8)
  Mirf.csnPin = 17; // PC3 = 17 (was 7)

  Mirf.init();
  Mirf.payload = sizeof(radio_packet);
  Mirf.channel = 2;
  Mirf.config(); //powers up RX by default

  Mirf.configRegister(EN_AA, (1 << ENAA_P0)| (1 << ENAA_P1));
  Mirf.configRegister(RF_SETUP, 0b1111); // 2 MBps rather than 2Mps (for reasons of signal

  Mirf.setRADDR(rx_address);

  Mirf.configRegister(SETUP_RETR, 0b0000 | 0b1111); // MAX auto re-transmit time, max 15 retries (MAX)

  Mirf.setTADDR(tx_address);
}

void flushTx(void)
{
    Mirf.csnLow();                    // Pull down chip select
    Mirf.spi->transfer( FLUSH_TX );     // Write cmd to flush tx fifo
    Mirf.csnHi();                    // Pull up chip select
}

void loop() {
  static long mytimer=0;
  static uint8_t index=0,sending=0; // start not sending
  uint16_t packet=0;
  long mytime=millis();
  struct radio_packet old_packet;

  while(1)
  {
  if (Mirf.dataReady())
  {
     Mirf.getData((uint8_t*) &radioData); // transfer all data (payload = 1 in this case)

     if (radioData.buttons1!=old_packet.buttons1) Serial.println("Buttons 1 changed!");
     if (radioData.buttons2!=old_packet.buttons2) Serial.println("Buttons 2 changed!");

     old_packet=radioData;
     /*Serial.println("****************************************");
     Serial.println(radioData.buttons1,BIN);
     Serial.println(radioData.buttons2,BIN);
     Serial.print(radioData.leftX);Serial.print(","); Serial.print(radioData.leftY);Serial.print(",");
     Serial.print(radioData.rightX);Serial.print(","); Serial.println(radioData.rightY);*/
     packet++;
  }
  if (millis()-mytime>=1000)
  {
    Serial.print("Packets per second:"); Serial.println(packet);
      packet=0;
      mytime=millis();
  }
  }

}