Diff: sx1276/sx1276.h

Revision:

0:e6ceb13d2d05

Child:

1:f979673946c0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sx1276/sx1276.h	Mon Aug 18 14:24:46 2014 +0000
@@ -0,0 +1,471 @@
+/*
+ / _____)             _              | |
+( (____  _____ ____ _| |_ _____  ____| |__
+ \____ \| ___ |    (_   _) ___ |/ ___)  _ \
+ _____) ) ____| | | || |_| ____( (___| | | |
+(______/|_____)_|_|_| \__)_____)\____)_| |_|
+    ( C )2014 Semtech
+
+Description: Actual implementation of a SX1276 radio, inherits Radio
+
+License: Revised BSD License, see LICENSE.TXT file include in the project
+
+Maintainers: Miguel Luis, Gregory Cristian and Nicolas Huguenin
+*/
+#ifndef __SX1276_H__
+#define __SX1276_H__
+
+#include "radio.h"
+#include "./registers/sx1276Regs-Fsk.h"
+#include "./registers/sx1276Regs-LoRa.h"
+#include "./typedefs/typedefs.h"
+
+#define XTAL_FREQ                                   32000000
+#define FREQ_STEP                                   61.03515625
+
+#define RX_BUFFER_SIZE                              256
+
+#define DEFAULT_TIMEOUT								200 //usec
+#define RSSI_OFFSET                                 -139.0
+
+
+/*!
+ * Constant values need to compute the RSSI value
+ */
+#define NOISE_ABSOLUTE_ZERO                         -174.0
+#define NOISE_FIGURE_LF                             4.0
+#define NOISE_FIGURE_HF                             6.0
+#define RSSI_OFFSET_LF                              -164.0
+#define RSSI_OFFSET_HF                              -157.0
+
+#define RF_MID_BAND_THRESH                          525000000
+
+/*! 
+ * Actual implementation of a SX1276 radio, inherits Radio
+ */
+class SX1276 : public Radio
+{
+protected:
+    /*!
+    * SPI Interface
+    */
+    SPI spi; // mosi, miso, sclk
+    DigitalOut nss;
+
+    /*!
+     * SX1276 Reset pin
+     */
+    DigitalOut reset;
+
+    /*!
+     * SX1276 DIO pins
+     */
+	InterruptIn dio0;
+	InterruptIn dio1;
+	InterruptIn dio2; 
+	InterruptIn dio3;
+	InterruptIn dio4;
+	DigitalIn dio5;
+	
+	bool isRadioActive;
+	
+	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:
+	SX1276( void ( *txDone )( ), void ( *txTimeout ) ( ), void ( *rxDone ) ( uint8_t *payload, uint16_t size, int8_t rssi, int8_t snr ), void ( *rxTimeout ) ( ), void ( *rxError ) ( ),
+			PinName mosi, PinName miso, PinName sclk, PinName nss, PinName reset,
+            PinName dio0, PinName dio1, PinName dio2, PinName dio3, PinName dio4, PinName dio5 ); 
+    SX1276( void ( *txDone )( ), void ( *txTimeout ) ( ), void ( *rxDone ) ( uint8_t *payload, uint16_t size, int8_t rssi, int8_t snr ), void ( *rxTimeout ) ( ), void ( *rxError ) ( ) );
+	virtual ~SX1276( );
+	
+	//-------------------------------------------------------------------------
+	//						Redefined Radio functions
+	//-------------------------------------------------------------------------
+	/*!
+     * Return current radio status
+     *
+     * @param status Radio status. [IDLE, RX_RUNNING, TX_RUNNING]
+     */
+    virtual RadioState GetState( void ); 
+    
+	/*!
+     * @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( ModemType modem, uint32_t freq, int8_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] crcOn        Enables/Disables the CRC [0: OFF, 1: ON]
+     * @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 ( ModemType modem, uint32_t bandwidth,
+                               uint32_t datarate, uint8_t coderate,
+                               uint32_t bandwidthAfc, uint16_t preambleLen,
+                               uint16_t symbTimeout, bool fixLen,
+                               bool crcOn, 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] 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( ModemType modem, int8_t power, uint32_t fdev,
+                              uint32_t bandwidth, uint32_t datarate,
+                              uint8_t coderate, uint16_t preambleLen,
+                              bool fixLen, bool crcOn,
+                              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 ( ModemType 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 Reads the current RSSI value
+     *
+     * @retval rssiValue Current RSSI value in [dBm]
+     */
+    virtual int8_t GetRssi ( ModemType 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 SX1276 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 SX1276 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 SX1276
+	 */
+	virtual void Reset( void ) = 0;
+	
+	//-------------------------------------------------------------------------
+	//						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 SX1276 operating mode
+	 *
+	 * @param [IN] opMode New operating mode
+	 */
+	virtual void SetOpMode( uint8_t opMode );
+
+	/*!
+	 * @brief Configures the SX1276 with the given modem
+	 *
+	 * @param [IN] modem Modem to be used [0: FSK, 1: LoRa] 
+	 */
+	virtual void SetModem( ModemType modem );
+
+	/*
+	 * SX1276 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 //__SX1276_H__
+