Lukas Formanek
use with LoRa Access Point
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__
+