File content as of revision 0:b1276e0d29a3:

#include "mbed.h"
#include "nRF24L01P.h"
RawSerial pc(PA_2, PA_3,9600 );

 
nRF24L01P my_nrf24l01p(D11, D12, D13, D10, D9,D8);    // mosi, miso, sck, csn, ce, irq
//nRF24L01P my_nrf24l01p(p5, p6, p7, p8, p9, p10);    // mosi, miso, sck, csn, ce, irq

//DigitalOut myled1(LED1);
//DigitalOut myled2(D3);

int main() {

// The nRF24L01+ supports transfers from 1 to 32 bytes, but Sparkfun's
//  "Nordic Serial Interface Board" (http://www.sparkfun.com/products/9019)
//  only handles 4 byte transfers in the ATMega code.
#define TRANSFER_SIZE   4

    char txData[TRANSFER_SIZE], rxData[TRANSFER_SIZE];
    int txDataCnt = 0;
    int rxDataCnt = 0;
int i=0;
    my_nrf24l01p.powerUp();
    my_nrf24l01p.setRfFrequency(NRF24L01P_MIN_RF_FREQUENCY);//2400-2525
    my_nrf24l01p.setRfOutputPower(NRF24L01P_TX_PWR_ZERO_DB);//mAX 0  -6 -12 -18
    my_nrf24l01p.setAirDataRate(NRF24L01P_DATARATE_250_KBPS);//250k,1000,2000K
    // Display the (default) setup of the nRF24L01+ chip
    pc.printf( "nRF24L01+ Frequency    : %d MHz\r\n",  my_nrf24l01p.getRfFrequency() );
    pc.printf( "nRF24L01+ Output power : %d dBm\r\n",  my_nrf24l01p.getRfOutputPower() );
    pc.printf( "nRF24L01+ Data Rate    : %d kbps\r\n", my_nrf24l01p.getAirDataRate() );
    pc.printf( "nRF24L01+ TX Address   : 0x%010llX\r\n", my_nrf24l01p.getTxAddress() );
    pc.printf( "nRF24L01+ RX Address   : 0x%010llX\r\n", my_nrf24l01p.getRxAddress() );

    pc.printf( "Type keys to test transfers:\r\n  (transfers are grouped into %d characters)\r\n", TRANSFER_SIZE );
    my_nrf24l01p.setTransferSize( TRANSFER_SIZE );//mAX 4

    my_nrf24l01p.setReceiveMode();
    my_nrf24l01p.enable();

    while (1) {

        // If we've received anything over the host serial link...
        if ( pc.readable() ) {

            // ...add it to the transmit buffer
            txData[txDataCnt++] = pc.getc();

            // If the transmit buffer is full
            if ( txDataCnt >= sizeof( txData ) ) {

                // Send the transmitbuffer via the nRF24L01+
                my_nrf24l01p.write( NRF24L01P_PIPE_P0, txData, txDataCnt );

                txDataCnt = 0;
            }

            // Toggle LED1 (to help debug Host -> nRF24L01+ communication)
  //          myled1 = !myled1;
        }
   txData[0]='A';    
   txData[1]='B';
   txData[2]='C';    
   txData[3]='0' + (i++ & 0x0f);    
#if   defined ( TARGET_NUCLEO_L053R8 )
 my_nrf24l01p.write( NRF24L01P_PIPE_P0, txData, 4 );
#endif 
        // If we've received anything in the nRF24L01+...
        if ( my_nrf24l01p.readable() ) {

            // ...read the data into the receive buffer
            rxDataCnt = my_nrf24l01p.read( NRF24L01P_PIPE_P0, rxData, sizeof( rxData ) );

            // Display the receive buffer contents via the host serial link
            for ( int i = 0; rxDataCnt > 0; rxDataCnt--, i++ ) {

                pc.putc( rxData[i] );
            }

            // Toggle LED2 (to help debug nRF24L01+ -> Host communication)
    //        myled1 = !myled1;
        }
    }
}