File content as of revision 23:273a2f93ae99:

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

Description: Actual implementation of a SX1272 radio, inherits Radio

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

Maintainers: Miguel Luis, Gregory Cristian and Nicolas Huguenin
*/
#ifndef __SX1272_H__
#define __SX1272_H__

#include "radio.h"
#include "./registers/sx1272Regs-Fsk.h"
#include "./registers/sx1272Regs-LoRa.h"
#include "./typedefs/typedefs.h"

extern SPI spi;
extern DigitalOut nss;

/*!
 * Radio wakeup time from SLEEP mode
 */
#define RADIO_WAKEUP_TIME                           1000 // [us]

/*!
 * SX1272 definitions
 */
#define XTAL_FREQ                                   32000000
#define FREQ_STEP                                   61.03515625

#define RX_BUFFER_SIZE                              256

/*!
 * Constant values need to compute the RSSI value
 */
#define RSSI_OFFSET_LF                              -164.0
#define RSSI_OFFSET_HF                              -157.0

#define RF_MID_BAND_THRESH                          525000000

/*! 
 * Actual implementation of a SX1272 radio, inherits Radio
 */
class SX1272 : public Radio
{
protected:
    /*!
    * SPI Interface
    */
    SPI spi; // mosi, miso, sclk
    DigitalOut nss;

    /*!
     * SX1272 Reset pin
     */
    DigitalInOut reset;

    /*!
     * SX1272 DIO pins
     */
    InterruptIn dio0;
    InterruptIn dio1;
    InterruptIn dio2; 
    InterruptIn dio3;
    InterruptIn dio4;
    DigitalIn dio5;
    
    bool isRadioActive;
    
    uint8_t boardConnected; //1 = SX1272MB1LAS; 0 = SX1272MB1MAS
    
    uint8_t *rxBuffer;
    
    uint8_t previousOpMode;
    
    /*!
     * Hardware DIO IRQ functions
     */
    DioIrqHandler *dioIrq;
    
    /*!
     * Tx and Rx timers
     */
    Timeout txTimeoutTimer;
    Timeout rxTimeoutTimer;
    Timeout rxTimeoutSyncWord;
    
    /*!
     *  rxTx: [1: Tx, 0: Rx]
     */
    uint8_t rxTx;
    
    RadioSettings_t settings;
    
    static const FskBandwidth_t FskBandwidths[] ;
protected:

    /*!
    * Performs the Rx chain calibration for LF and HF bands
    * \remark Must be called just after the reset so all registers are at their
    *         default values
    */
    void RxChainCalibration( void );

public:
    SX1272( RadioEvents_t *events,
//            PinName mosi, PinName miso, PinName sclk, PinName nss, PinName reset,
            PinName PTD6, PinName PTD7, PinName PTD5, PinName PTD4, PinName reset,
            PinName dio0, PinName dio1, PinName dio2, PinName dio3, PinName dio4, PinName dio5 ); 
    SX1272( RadioEvents_t *events );
    virtual ~SX1272( );
    
    //-------------------------------------------------------------------------
    //                        Redefined Radio functions
    //-------------------------------------------------------------------------
    /*!
     * @brief Initializes the radio
     *
     * @param [IN] events Structure containing the driver callback functions
     */
    virtual void Init( RadioEvents_t *events );
    /*!
     * Return current radio status
     *
     * @param status Radio status. [RF_IDLE, RX_RUNNING, TX_RUNNING]
     */
    virtual RadioState GetStatus( void ); 
    
    /*!
     * @brief Configures the SX1272 with the given modem
     *
     * @param [IN] modem Modem to be used [0: FSK, 1: LoRa] 
     */
    virtual void SetModem( RadioModems_t modem );

    /*!
     * @brief Sets the channel frequency
     *
     * @param [IN] freq         Channel RF frequency
     */
    virtual void SetChannel( uint32_t freq );
    
    /*!
     * @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 );
    
    /*!
     * @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 );
    
    /*!
     * @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 ( LoRa only )
     *                          FSK : N/A ( set to 0 )
     *                          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 );
    
    /*!
     * @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 );
    
    /*!
     * @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 double TimeOnAir ( RadioModems_t modem, uint8_t pktLen );
    
    /*!
     * @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
     */
    virtual void Send( uint8_t *buffer, uint8_t size );
    
    /*!
     * @brief Sets the radio in sleep mode
     */
    virtual void Sleep( void );
    
    /*!
     * @brief Sets the radio in standby mode
     */
    virtual void Standby( void );
    
    /*!
     * @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 );
    
    /*!
     * @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 );
    
    /*!
     * @brief Start a Channel Activity Detection
     */
    virtual void StartCad( void );    
    
    /*!
     * @brief Reads the current RSSI value
     *
     * @retval rssiValue Current RSSI value in [dBm]
     */
    virtual int16_t GetRssi ( RadioModems_t modem );
    
    /*!
     * @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, uint8_t *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, uint8_t *buffer, uint8_t size ) = 0;
    
    /*!
     * @brief Writes the buffer contents to the SX1272 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( uint8_t *buffer, uint8_t size ) = 0;

    /*!
     * @brief Reads the contents of the SX1272 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( uint8_t *buffer, uint8_t size ) = 0;
    /*!
     * @brief Resets the SX1272
     */
    virtual void Reset( void ) = 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 );
    
    //-------------------------------------------------------------------------
    //                        Board relative functions
    //-------------------------------------------------------------------------
    
protected:
    /*!
     * @brief Initializes the radio I/Os pins interface
     */
    virtual void IoInit( void ) = 0;
    
    /*!
     *    @brief Initializes the radio registers
     */
    virtual void RadioRegistersInit( ) = 0;
    
    /*!
     * @brief Initializes the radio SPI
     */
    virtual void SpiInit( void ) = 0;
    
    /*!
     * @brief Initializes DIO IRQ handlers
     *
     * @param [IN] irqHandlers Array containing the IRQ callback functions
     */
    virtual void IoIrqInit( DioIrqHandler *irqHandlers ) = 0;

    /*!
     * @brief De-initializes the radio I/Os pins interface. 
     *
     * \remark Useful when going in MCU lowpower modes
     */
    virtual void IoDeInit( void ) = 0;

    /*!
     * @brief Gets the board PA selection configuration
     *
     * @param [IN] channel Channel frequency in Hz
     * @retval PaSelect RegPaConfig PaSelect value
     */
    virtual uint8_t GetPaSelect( uint32_t channel ) = 0;

    /*!
     * @brief Set the RF Switch I/Os pins in Low Power mode
     *
     * @param [IN] status enable or disable
     */
    virtual void SetAntSwLowPower( bool status ) = 0;

    /*!
     * @brief Initializes the RF Switch I/Os pins interface
     */
    virtual void AntSwInit( void ) = 0;

    /*!
     * @brief De-initializes the RF Switch I/Os pins interface 
     *
     * \remark Needed to decrease the power consumption in MCU lowpower modes
     */
    virtual void AntSwDeInit( void ) = 0;

    /*!
     * @brief Controls the antena switch if necessary.
     *
     * \remark see errata note
     *
     * @param [IN] rxTx [1: Tx, 0: Rx]
     */
    virtual void SetAntSw( uint8_t rxTx ) = 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;
protected:

    /*!
     * @brief Sets the SX1272 operating mode
     *
     * @param [IN] opMode New operating mode
     */
    virtual void SetOpMode( uint8_t opMode );

    /*
     * SX1272 DIO IRQ callback functions prototype
     */

    /*!
     * @brief DIO 0 IRQ callback
     */
    virtual void OnDio0Irq( void );

    /*!
     * @brief DIO 1 IRQ callback
     */
    virtual void OnDio1Irq( void );

    /*!
     * @brief DIO 2 IRQ callback
     */
    virtual void OnDio2Irq( void );

    /*!
     * @brief DIO 3 IRQ callback
     */
    virtual void OnDio3Irq( void );

    /*!
     * @brief DIO 4 IRQ callback
     */
    virtual void OnDio4Irq( void );

    /*!
     * @brief DIO 5 IRQ callback
     */
    virtual void OnDio5Irq( void );

    /*!
     * @brief Tx & Rx timeout timer callback
     */
    virtual void OnTimeoutIrq( void );
    
    /*!
     * Returns the known FSK bandwidth registers value
     *
     * \param [IN] bandwidth Bandwidth value in Hz
     * \retval regValue Bandwidth register value.
     */
    static uint8_t GetFskBandwidthRegValue( uint32_t bandwidth );
};

#endif // __SX1272_H__