File content as of revision 12:02d779e8c4f6:

/*
 / _____)             _              | |
( (____  _____ ____ _| |_ _____  ____| |__
 \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 _____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
    (C) 2014 Semtech

Description: Interface for the radios, contains the main functions that a radio needs, and 5 callback functions

License: Revised BSD License, see LICENSE.TXT file include in the project

Maintainers: Miguel Luis, Gregory Cristian and Nicolas Huguenin
*/
#ifndef __RADIO_H__
#define __RADIO_H__

#ifdef __MBED__
#include "mbed.h"
#endif
#ifdef ARDUINO
#include <arduino.h>
#endif

/*!
 * Radio driver internal state machine states definition
 */
typedef enum RadioState
{
    RF_IDLE = 0,
    RF_RX_RUNNING,
    RF_TX_RUNNING,
    RF_CAD,
} RadioState_t;


/*!
 *    Type of the modem. [LORA / FSK]
 */
typedef enum ModemType
{
    MODEM_FSK = 0,
    MODEM_LORA
}RadioModems_t;


/*!
 * Radio LoRa modem parameters
 */
typedef struct
{
    int8_t   Power;
    uint32_t Bandwidth;
    uint32_t Datarate;
    bool     LowDatarateOptimize;
    uint8_t  Coderate;
    uint16_t PreambleLen;
    bool     FixLen;
    uint8_t  PayloadLen;
    bool     CrcOn;
    bool     FreqHopOn;
    uint8_t  HopPeriod;
    bool     IqInverted;
    bool     RxContinuous;
    uint32_t TxTimeout;
    bool     PublicNetwork;
}RadioLoRaSettings_t;

/*!
 * Radio FSK modem parameters
 */
typedef struct
{
    int8_t   Power;
    uint32_t Fdev;
    uint32_t Bandwidth;
    uint32_t BandwidthAfc;
    uint32_t Datarate;
    uint16_t PreambleLen;
    bool     FixLen;
    uint8_t  PayloadLen;
    bool     CrcOn;
    bool     IqInverted;
    bool     RxContinuous;
    uint32_t TxTimeout;
    uint32_t RxSingleTimeout;
}RadioFskSettings_t;

/*!
 * Radio FSK packet handler state
 */
typedef struct
{
    uint8_t  PreambleDetected;
    uint8_t  SyncWordDetected;
    int8_t   RssiValue;
    int32_t  AfcValue;
    uint8_t  RxGain;
    uint16_t Size;
    uint16_t NbBytes;
    uint8_t  FifoThresh;
    uint8_t  ChunkSize;
}RadioFskPacketHandler_t;

/*!
 * Radio LoRa packet handler state
 */
typedef struct
{
    int8_t SnrValue;
    int8_t RssiValue;
    uint8_t Size;
}RadioLoRaPacketHandler_t;

/*!
 * Radio Settings
 */
typedef struct
{
    RadioState               State;
    ModemType                Modem;
    uint32_t                 Channel;
    RadioFskSettings_t       Fsk;
    RadioFskPacketHandler_t  FskPacketHandler;
    RadioLoRaSettings_t      LoRa;
    RadioLoRaPacketHandler_t LoRaPacketHandler;
}RadioSettings_t;

/*!
 * @brief Radio driver callback functions
 */
typedef struct
{
    /*!
     * @brief  Tx Done callback prototype.
     */
    void    ( *TxDone )(void *radio, void *userThisPtr, void *userData);
    /*!
     * @brief  Tx Timeout callback prototype.
     */
    void    ( *TxTimeout )(void *radio, void *userThisPtr, void *userData);
    /*!
     * @brief Rx Done callback prototype.
     *
     * @param [IN] payload Received buffer pointer
     * @param [IN] size    Received buffer size
     * @param [IN] rssi    RSSI value computed while receiving the frame [dBm]
     * @param [IN] snr     Raw SNR value given by the radio hardware
     *                     FSK : N/A ( set to 0 )
     *                     LoRa: SNR value in dB
     */
    void    ( *RxDone )(void *radio, void *userThisPtr, void *userData, uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr );
    /*!
     * @brief  Rx Timeout callback prototype.
     */
    void    ( *RxTimeout )(void *radio, void *userThisPtr, void *userData);
    /*!
     * @brief Rx Error callback prototype.
     */
    void    ( *RxError )(void *radio, void *userThisPtr, void *userData);
    /*!
     * \brief  FHSS Change Channel callback prototype.
     *
     * \param [IN] currentChannel   Index number of the current channel
     */
    void ( *FhssChangeChannel )(void *radio, void *userThisPtr, void *userData, uint8_t currentChannel );

    /*!
     * @brief CAD Done callback prototype.
     *
     * @param [IN] channelDetected    Channel Activity detected during the CAD
     */
    void ( *CadDone ) (void *radio, void *userThisPtr, void *userData, bool channelActivityDetected );
    
    /*
     * Optional data which is being provided in callbacks
     * can be used e.g. for the C++ this pointer.
     */
    void *userThisPtr;
    
    /*
     * Optional data which allows to bring in data structures pointer 
     * for a given radio. As callbacks are being called in interrupt level
     * the userData is perfect to know the context without iterating this
     * data structures.
     */
    void *userData;

}RadioEvents_t;

/*!
 *    Interface for the radios, contains the main functions that a radio needs, and 5 callback functions
 */
class Radio
{
protected:
    RadioEvents_t* RadioEvents;

public:
    //-------------------------------------------------------------------------
    //                        Constructor
    //-------------------------------------------------------------------------
    /*!
     * @brief Constructor of the radio object, the parameters are the callback functions described in the header.
     *
     * @param [IN] events Structure containing the driver callback functions
     */
    Radio( RadioEvents_t *events );
    virtual ~Radio( ) {};

    //-------------------------------------------------------------------------
    //                        Pure virtual functions
    //-------------------------------------------------------------------------

    /*!
     * @brief Initializes the radio
     *
     * @param [IN] events Structure containing the driver callback functions
     */
    virtual bool Init( RadioEvents_t *events ) = 0;

    /*!
     * @brief Return current radio status, returns true if a radios has been found.
     *
     * @param status Radio status. [RF_IDLE, RX_RUNNING, TX_RUNNING, CAD_RUNNING]
     */
    virtual RadioState GetStatus( void ) = 0; 

    /*!
     * @brief Configures the radio with the given modem
     *
     * @param [IN] modem Modem to be used [0: FSK, 1: LoRa] 
     */
    virtual void SetModem( RadioModems_t modem ) = 0;

    /*!
     * @brief Sets the channel frequency
     *
     * @param [IN] freq         Channel RF frequency
     */
    virtual void SetChannel( uint32_t freq ) = 0;
    
    /*!
     * @brief Sets the channels configuration
     *
     * @param [IN] modem      Radio modem to be used [0: FSK, 1: LoRa]
     * @param [IN] freq       Channel RF frequency
     * @param [IN] rssiThresh RSSI threshold
     *
     * @retval isFree         [true: Channel is free, false: Channel is not free]
     */
    virtual bool IsChannelFree( RadioModems_t modem, uint32_t freq, int16_t rssiThresh ) = 0;
    
    /*!
     * @brief Generates a 32 bits random value based on the RSSI readings
     *
     * \remark This function sets the radio in LoRa modem mode and disables
     *         all interrupts.
     *         After calling this function either Radio.SetRxConfig or
     *         Radio.SetTxConfig functions must be called.
     *
     * @retval randomValue    32 bits random value
     */
    virtual uint32_t Random( void )= 0;
    
    /*!
     * @brief Sets the reception parameters
     *
     * @param [IN] modem        Radio modem to be used [0: FSK, 1: LoRa]
     * @param [IN] bandwidth    Sets the bandwidth
     *                          FSK : >= 2600 and <= 250000 Hz
     *                          LoRa: [0: 125 kHz, 1: 250 kHz,
     *                                 2: 500 kHz, 3: Reserved]
     * @param [IN] datarate     Sets the Datarate
     *                          FSK : 600..300000 bits/s
     *                          LoRa: [6: 64, 7: 128, 8: 256, 9: 512,
     *                                10: 1024, 11: 2048, 12: 4096  chips]
     * @param [IN] coderate     Sets the coding rate ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          LoRa: [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
     * @param [IN] bandwidthAfc Sets the AFC Bandwidth ( FSK only )
     *                          FSK : >= 2600 and <= 250000 Hz
     *                          LoRa: N/A ( set to 0 )
     * @param [IN] preambleLen  Sets the Preamble length ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          LoRa: Length in symbols ( the hardware adds 4 more symbols )
     * @param [IN] symbTimeout  Sets the RxSingle timeout value
     *                          FSK : timeout number of bytes
     *                          LoRa: timeout in symbols
     * @param [IN] fixLen       Fixed length packets [0: variable, 1: fixed]
     * @param [IN] payloadLen   Sets payload length when fixed lenght is used
     * @param [IN] crcOn        Enables/Disables the CRC [0: OFF, 1: ON]
     * @param [IN] freqHopOn    Enables disables the intra-packet frequency hopping  [0: OFF, 1: ON] (LoRa only)
     * @param [IN] hopPeriod    Number of symbols bewteen each hop (LoRa only)
     * @param [IN] iqInverted   Inverts IQ signals ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          LoRa: [0: not inverted, 1: inverted]
     * @param [IN] rxContinuous Sets the reception in continuous mode
     *                          [false: single mode, true: continuous mode]
     */
    virtual void SetRxConfig ( RadioModems_t modem, uint32_t bandwidth,
                               uint32_t datarate, uint8_t coderate,
                               uint32_t bandwidthAfc, uint16_t preambleLen,
                               uint16_t symbTimeout, bool fixLen,
                               uint8_t payloadLen,
                               bool crcOn, bool freqHopOn, uint8_t hopPeriod,
                               bool iqInverted, bool rxContinuous ) = 0;

    /*!
     * @brief Sets the transmission parameters
     *
     * @param [IN] modem        Radio modem to be used [0: FSK, 1: LoRa]
     * @param [IN] power        Sets the output power [dBm]
     * @param [IN] fdev         Sets the frequency deviation ( FSK only )
     *                          FSK : [Hz]
     *                          LoRa: 0
     * @param [IN] bandwidth    Sets the bandwidth ( LoRa only )
     *                          FSK : 0
     *                          LoRa: [0: 125 kHz, 1: 250 kHz,
     *                                 2: 500 kHz, 3: Reserved]
     * @param [IN] datarate     Sets the Datarate
     *                          FSK : 600..300000 bits/s
     *                          LoRa: [6: 64, 7: 128, 8: 256, 9: 512,
     *                                10: 1024, 11: 2048, 12: 4096  chips]
     * @param [IN] coderate     Sets the coding rate ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          LoRa: [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
     * @param [IN] preambleLen  Sets the preamble length
     * @param [IN] fixLen       Fixed length packets [0: variable, 1: fixed]
     * @param [IN] crcOn        Enables disables the CRC [0: OFF, 1: ON]
     * @param [IN] freqHopOn    Enables disables the intra-packet frequency hopping  [0: OFF, 1: ON] (LoRa only)
     * @param [IN] hopPeriod    Number of symbols bewteen each hop (LoRa only)
     * @param [IN] iqInverted   Inverts IQ signals ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          LoRa: [0: not inverted, 1: inverted]
     * @param [IN] timeout      Transmission timeout [us]
     */
    virtual void SetTxConfig( RadioModems_t modem, int8_t power, uint32_t fdev,
                              uint32_t bandwidth, uint32_t datarate,
                              uint8_t coderate, uint16_t preambleLen,
                              bool fixLen, bool crcOn, bool freqHopOn,
                              uint8_t hopPeriod, bool iqInverted, uint32_t timeout ) = 0;

    /*!
     * @brief Checks if the given RF frequency is supported by the hardware
     *
     * @param [IN] frequency RF frequency to be checked
     * @retval isSupported [true: supported, false: unsupported]
     */
    virtual bool CheckRfFrequency( uint32_t frequency ) = 0;
    
    /*!
     * @brief Computes the packet time on air for the given payload
     *
     * \Remark Can only be called once SetRxConfig or SetTxConfig have been called
     *
     * @param [IN] modem      Radio modem to be used [0: FSK, 1: LoRa]
     * @param [IN] pktLen     Packet payload length
     *
     * @retval airTime        Computed airTime for the given packet payload length
     */
    virtual uint32_t TimeOnAir ( RadioModems_t modem, int16_t pktLen ) = 0;
    
    /*!
     * @brief Sends the buffer of size. Prepares the packet to be sent and sets
     *        the radio in transmission
     *
     * @param [IN]: buffer     Buffer pointer
     * @param [IN]: size       Buffer size
     * @param [IN]: buffer     Header pointer
     * @param [IN]: size       Header size
     */
    virtual void Send( void *buffer, int16_t size, void *header = NULL, int16_t hsize = 0) = 0;

    /*!
     * @brief Sets the radio in sleep mode
     */
    virtual void Sleep( void ) = 0;

    /*!
     * @brief Sets the radio in standby mode
     */
    virtual void Standby( void ) = 0;

    /*!
     * @brief Sets the radio in CAD mode
     */
    virtual void StartCad( void ) = 0;

    /*!
     * @brief Sets the radio in reception mode for the given time
     * @param [IN] timeout Reception timeout [us]
     *                     [0: continuous, others timeout]
     */
    virtual void Rx( uint32_t timeout ) = 0;
    
    /*!
     * @brief Check is radio receives a signal
     */
    virtual bool RxSignalPending() = 0;


    /*!
     * @brief Sets the radio in transmission mode for the given time
     * @param [IN] timeout Transmission timeout [us]
     *                     [0: continuous, others timeout]
     */
    virtual void Tx( uint32_t timeout ) = 0;

    /*!
     * @brief Sets the radio in continuous wave transmission mode
     *
     * @param [IN]: freq       Channel RF frequency
     * @param [IN]: power      Sets the output power [dBm]
     * @param [IN]: time       Transmission mode timeout [s]
     */
    virtual void SetTxContinuousWave( uint32_t freq, int8_t power, uint16_t time ) = 0;

    /*!
     * @brief Returns the maximal transfer unit for a given modem
     *
     * @retval MTU size in bytes
     */
    virtual int16_t MaxMTUSize( RadioModems_t modem ) = 0;
    
    /*!
     * @brief Reads the current RSSI value
     *
     * @retval rssiValue Current RSSI value in [dBm]
     */
    virtual int16_t GetRssi ( RadioModems_t modem ) = 0;

    /*!
     * @brief Reads the current frequency error
     *
     * @retval frequency error value in [Hz]
     */
    virtual int32_t GetFrequencyError( RadioModems_t modem ) = 0;

    /*!
     * @brief Writes the radio register at the specified address
     *
     * @param [IN]: addr Register address
     * @param [IN]: data New register value
     */
    virtual void Write ( uint8_t addr, uint8_t data ) = 0;

    /*!
     * @brief Reads the radio register at the specified address
     *
     * @param [IN]: addr Register address
     * @retval data Register value
     */
    virtual uint8_t Read ( uint8_t addr ) = 0;

    /*!
     * @brief Writes multiple radio registers starting at address
     *
     * @param [IN] addr   First Radio register address
     * @param [IN] buffer Buffer containing the new register's values
     * @param [IN] size   Number of registers to be written
     */
    virtual void Write( uint8_t addr, void *buffer, uint8_t size ) = 0;

    /*!
     * @brief Reads multiple radio registers starting at address
     *
     * @param [IN] addr First Radio register address
     * @param [OUT] buffer Buffer where to copy the registers data
     * @param [IN] size Number of registers to be read
     */
    virtual void Read ( uint8_t addr, void *buffer, uint8_t size ) = 0;

    /*!
     * @brief Writes the buffer contents to the Radio FIFO
     *
     * @param [IN] buffer Buffer containing data to be put on the FIFO.
     * @param [IN] size Number of bytes to be written to the FIFO
     */
    virtual void WriteFifo( void *buffer, uint8_t size ) = 0;

    /*!
     * @brief Reads the contents of the Radio FIFO
     *
     * @param [OUT] buffer Buffer where to copy the FIFO read data.
     * @param [IN] size Number of bytes to be read from the FIFO
     */
    virtual void ReadFifo( void *buffer, uint8_t size ) = 0;

    /*!
     * @brief Sets the maximum payload length.
     *
     * @param [IN] modem      Radio modem to be used [0: FSK, 1: LoRa]
     * @param [IN] max        Maximum payload length in bytes
     */
    virtual void SetMaxPayloadLength( RadioModems_t modem, uint8_t max ) = 0;

    /*!
     * @brief Sets the network to public or private. Updates the sync byte.
     *
     * @remark Applies to LoRa modem only
     *
     * @param [IN] enable if true, it enables a public network
     */
    virtual void SetPublicNetwork( bool enable ) = 0;
    
    /*!
     * \brief Sets the radio output power.
     *
     * @param [IN] power Sets the RF output power
     */
    virtual void SetRfTxPower( int8_t power ) = 0;

};

#endif // __RADIO_H__