File content as of revision 14:6c312f8635fe:

#include "mbed.h"
#include "main.h"
#include "sx1272-hal.h"
#include "debug.h"

/* Set this flag to '1' to display debug messages on the console */
#define DEBUG_MESSAGE   1


#define RF_FREQUENCY                                868000000 // Hz
#define TX_OUTPUT_POWER                             14        // 14 dBm

#define LORA_BANDWIDTH                              2         // [0: 125 kHz,
                                                              //  1: 250 kHz,
                                                              //  2: 500 kHz,
                                                              //  3: Reserved]
                                                              
#define LORA_SPREADING_FACTOR                       7         // [SF7..SF12]
#define LORA_CODINGRATE                             1         // [1: 4/5,
                                                              //  2: 4/6,
                                                              //  3: 4/7,
                                                              //  4: 4/8]
                              
#define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT                         5         // Symbols
#define LORA_FIX_LENGTH_PAYLOAD_ON                  false
#define LORA_FHSS_ENABLED                           false
#define LORA_NB_SYMB_HOP                            4
#define LORA_IQ_INVERSION_ON                        false
#define LORA_CRC_ENABLED                            true

#define RX_TIMEOUT_VALUE                            3500000   // in us
#define BUFFER_SIZE                                 32        // Define the payload size here

DigitalOut led(LED1);

/*
 *  Global variables declarations
 */
typedef enum {
    LOWPOWER = 0,
    IDLE,

    RX,
    RX_TIMEOUT,
    RX_ERROR,

    TX,
    TX_TIMEOUT,

    CAD,
    CAD_DONE
} AppStates_t;

volatile AppStates_t State = LOWPOWER;

/*!
 * Radio events function pointer
 */
static RadioEvents_t RadioEvents;

/*
 *  Global variables declarations
 */
SX1272MB2xAS Radio( NULL );

const uint8_t PingMsg[] = "PING";
const uint8_t PongMsg[] = "PONG";

uint16_t BufferSize = BUFFER_SIZE;
uint8_t Buffer[BUFFER_SIZE];

int16_t RssiValue = 0.0;
int8_t SnrValue = 0.0;

int main()
{
    uint8_t i;

    debug( "\n\n\r     iGreenhouse Application \n\n\r" );

    // Initialize Radio driver
    RadioEvents.TxDone = OnTxDone;
    RadioEvents.RxDone = OnRxDone;
    RadioEvents.RxError = OnRxError;
    RadioEvents.TxTimeout = OnTxTimeout;
    RadioEvents.RxTimeout = OnRxTimeout;
    Radio.Init( &RadioEvents );

    // verify the connection with the board
    while( Radio.Read( REG_VERSION ) == 0x00  ) {
        debug( "Radio could not be detected!\n\r", NULL );
        wait( 1 );
    }

    debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1272MB2XAS ) ) , "\n\r > Board Type: SX1272MB2xAS < \n\r" );

    Radio.SetChannel( RF_FREQUENCY );


    debug_if( LORA_FHSS_ENABLED, "\n\n\r             > LORA FHSS Mode < \n\n\r");
    debug_if( !LORA_FHSS_ENABLED, "\n\n\r             > LORA Mode < \n\n\r");

    Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
                       LORA_SPREADING_FACTOR, LORA_CODINGRATE,
                       LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
                       LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
                       LORA_IQ_INVERSION_ON, 2000000 );

    Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
                       LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
                       LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
                       LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
                       LORA_IQ_INVERSION_ON, true );


    debug_if( DEBUG_MESSAGE, "Starting listening loop\r\n" );

    led = 0;

    Radio.Rx( RX_TIMEOUT_VALUE );

    while( 1 ) {
        switch( State ) {
            case RX:
                    if( BufferSize > 0 ) {
                        if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 ) {
                            led = !led;
                            debug( "...Ping\r\n" );
                            // Send the reply to the PING string
                            strcpy( ( char* )Buffer, ( char* )PongMsg );
                            // We fill the buffer with numbers for the payload
                            for( i = 4; i < BufferSize; i++ ) {
                                Buffer[i] = i - 4;
                            }
                            wait_ms( 10 );
                            Radio.Send( Buffer, BufferSize );
                        } else { // valid reception but not a PING as expected
                            // Set device as master and start again
                            isMaster = true;
                            Radio.Rx( RX_TIMEOUT_VALUE );
                        }
                    }
                State = LOWPOWER;
                break;
            case TX:
                led = !led;
                    debug( "Pong...\r\n" );
                Radio.Rx( RX_TIMEOUT_VALUE );
                State = LOWPOWER;
                break;
            case RX_TIMEOUT:
                    Radio.Rx( RX_TIMEOUT_VALUE );
                State = LOWPOWER;
                break;
            case RX_ERROR:
                // We have received a Packet with a CRC error, send reply as if packet was correct
                    // Send the next PONG frame
                    strcpy( ( char* )Buffer, ( char* )PongMsg );
                    for( i = 4; i < BufferSize; i++ ) {
                        Buffer[i] = i - 4;
                    }
                    wait_ms( 10 );
                    Radio.Send( Buffer, BufferSize );
                State = LOWPOWER;
                break;
            case TX_TIMEOUT:
                Radio.Rx( RX_TIMEOUT_VALUE );
                State = LOWPOWER;
                break;
            case LOWPOWER:
                break;
            default:
                State = LOWPOWER;
                break;
        }
    }
}

void OnTxDone( void )
{
    Radio.Sleep( );
    State = TX;
    debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" );
}

void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
{
    Radio.Sleep( );
    BufferSize = size;
    memcpy( Buffer, payload, BufferSize );
    RssiValue = rssi;
    SnrValue = snr;
    State = RX;
    debug_if( DEBUG_MESSAGE, "> OnRxDone\n\r" );
}

void OnTxTimeout( void )
{
    Radio.Sleep( );
    State = TX_TIMEOUT;
    debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" );
}

void OnRxTimeout( void )
{
    Radio.Sleep( );
    Buffer[ BufferSize ] = 0;
    State = RX_TIMEOUT;
    debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
}

void OnRxError( void )
{
    Radio.Sleep( );
    State = RX_ERROR;
    debug_if( DEBUG_MESSAGE, "> OnRxError\n\r" );
}