/*!
 * \file      main.c
 *
 * \brief     Radio sensitivity test
 *
 * \remark    When LED1 stops blinking LoRa packets aren't received any more and
 *            the sensitivity level has been reached.
 *            By reading the RF generator output power we can estimate the board
 *            sensitivity
 *
 * \copyright Revised BSD License, see section \ref LICENSE.
 *
 * \code
 *                ______                              _
 *               / _____)             _              | |
 *              ( (____  _____ ____ _| |_ _____  ____| |__
 *               \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 *               _____) ) ____| | | || |_| ____( (___| | | |
 *              (______/|_____)_|_|_| \__)_____)\____)_| |_|
 *              (C)2013-2017 Semtech
 *
 * \endcode
 *
 * \author    Miguel Luis ( Semtech )
 *
 * \author    Gregory Cristian ( Semtech )
 */
#include "board.h"
#include "gpio.h"
#include "timer.h"
#include "radio.h"

#if defined( REGION_AS923 )

#define RF_FREQUENCY                                923000000 // Hz

#elif defined( REGION_AU915 )

#define RF_FREQUENCY                                915000000 // Hz

#elif defined( REGION_CN470 )

#define RF_FREQUENCY                                470000000 // Hz

#elif defined( REGION_CN779 )

#define RF_FREQUENCY                                779000000 // Hz

#elif defined( REGION_EU433 )

#define RF_FREQUENCY                                433000000 // Hz

#elif defined( REGION_EU868 )

#define RF_FREQUENCY                                868000000 // Hz

#elif defined( REGION_KR920 )

#define RF_FREQUENCY                                920000000 // Hz

#elif defined( REGION_IN865 )

#define RF_FREQUENCY                                865000000 // Hz

#elif defined( REGION_US915 )

#define RF_FREQUENCY                                915000000 // Hz

#elif defined( REGION_RU864 )

#define RF_FREQUENCY                                864000000 // Hz

#else
    #error "Please define a frequency band in the compiler options."
#endif

#if defined( USE_MODEM_LORA )

#define LORA_BANDWIDTH                              0         // [0: 125 kHz,
                                                              //  1: 250 kHz,
                                                              //  2: 500 kHz,
                                                              //  3: Reserved]
#define LORA_SPREADING_FACTOR                       10        // [SF7..SF12]
#define LORA_CODINGRATE                             1         // [1: 4/5,
                                                              //  2: 4/6,
                                                              //  3: 4/7,
                                                              //  4: 4/8]
#define LORA_SYMBOL_TIMEOUT                         5         // Symbols
#define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
#define LORA_FIX_LENGTH_PAYLOAD_ON                  false
#define LORA_IQ_INVERSION_ON                        false

#elif defined( USE_MODEM_FSK )

#define FSK_DATARATE                                50000     // bps
#define FSK_BANDWIDTH                               50000     // Hz
#define FSK_AFC_BANDWIDTH                           83333     // Hz
#define FSK_PREAMBLE_LENGTH                         5         // Same for Tx and Rx
#define FSK_FIX_LENGTH_PAYLOAD_ON                   false

#else
    #error "Please define a modem in the compiler options."
#endif

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

/*!
 * LED GPIO pins objects
 */
extern Gpio_t Led1;

/*!
 * \brief Function to be executed on Radio Rx Done event
 */
void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr );

/*!
 * Main application entry point.
 */
int main( void )
{
    // Target board initialization
    BoardInitMcu( );
    BoardInitPeriph( );

    // Radio initialization
    RadioEvents.RxDone = OnRxDone;

    Radio.Init( &RadioEvents );

    Radio.SetChannel( RF_FREQUENCY );

#if defined( USE_MODEM_LORA )

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

    Radio.SetMaxPayloadLength( MODEM_LORA, 255 );

#elif defined( USE_MODEM_FSK )

    Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
                                  0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
                                  0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, true,
                                  0, 0, false, true );

    Radio.SetMaxPayloadLength( MODEM_FSK, 255 );

#else
    #error "Please define a frequency band in the compiler options."
#endif

    Radio.Rx( 0 ); // Continuous Rx

    while( 1 )
    {
        BoardLowPowerHandler( );
        // Process Radio IRQ
        if( Radio.IrqProcess != NULL )
        {
            Radio.IrqProcess( );
        }
    }
}

void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr )
{
    static uint8_t ledState = 1;
    // Toggle LED 1
    ledState ^= 1;
    GpioWrite( &Led1, ledState );
}
