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sx1276.c
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/*!
* \file sx1276.c
*
* \brief SX1276 driver implementation
*
* \copyright Revised BSD License, see section \ref LICENSE.
*
* \code
* ______ _
* / _____) _ | |
* ( (____ _____ ____ _| |_ _____ ____| |__
* \____ \| ___ | (_ _) ___ |/ ___) _ \
* _____) ) ____| | | || |_| ____( (___| | | |
* (______/|_____)_|_|_| \__)_____)\____)_| |_|
* (C)2013-2017 Semtech
*
* \endcode
*
* \author Miguel Luis ( Semtech )
*
* \author Gregory Cristian ( Semtech )
*
* \author Wael Guibene ( Semtech )
*/
/**
******************************************************************************
* @file sx1276.c
* @author MCD Application Team
* @brief driver sx1276
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2018 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
#include <it_sdk/config.h>
#if ( ( ITSDK_WITH_LORAWAN_LIB == __ENABLE ) && (ITSDK_LORAWAN_LIB == __LORAWAN_SX1276) ) \
||( ( ITSDK_WITH_SIGFOX_LIB == __ENABLE ) && (ITSDK_SIGFOX_LIB == __SIGFOX_SX1276) )
/* Includes ------------------------------------------------------------------*/
#include <drivers/sx1276/hw.h>
#include <drivers/lorawan/phy/radio.h>
#include <drivers/sx1276/sx1276.h>
#include <drivers/lorawan/timeServer.h>
/*
* Local types definition
*/
/*!
* Radio registers definition
*/
typedef struct
{
RadioModems_t Modem;
uint8_t Addr;
uint8_t Value;
}RadioRegisters_t;
/*!
* FSK bandwidth definition
*/
typedef struct
{
uint32_t bandwidth;
uint8_t RegValue;
}FskBandwidth_t;
/*
* Private functions prototypes
*/
/*!
* \brief Sets the SX1276 in transmission mode for the given time
* \param [IN] timeout Transmission timeout [ms] [0: continuous, others timeout]
*/
void SX1276SetTx( uint32_t timeout );
/*!
* \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
*/
void SX1276WriteFifo( uint8_t *buffer, uint8_t size );
/*!
* \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
*/
void SX1276ReadFifo( uint8_t *buffer, uint8_t size );
/*!
* \brief Sets the SX1276 operating mode
*
* \param [IN] opMode New operating mode
*/
void SX1276SetOpMode( uint8_t opMode );
/*
* SX1276 DIO IRQ callback functions prototype
*/
/*!
* \brief DIO 0 IRQ callback
*/
void SX1276OnDio0Irq( void* context );
/*!
* \brief DIO 1 IRQ callback
*/
void SX1276OnDio1Irq( void* context );
/*!
* \brief DIO 2 IRQ callback
*/
void SX1276OnDio2Irq( void* context );
/*!
* \brief DIO 3 IRQ callback
*/
void SX1276OnDio3Irq( void* context );
/*!
* \brief DIO 4 IRQ callback
*/
void SX1276OnDio4Irq( void* context );
/*!
* \brief DIO 5 IRQ callback
*/
void SX1276OnDio5Irq( void* context );
/*!
* \brief Tx & Rx timeout timer callback
*/
void SX1276OnTimeoutIrq( void* context );
/*
* Private global constants
*/
/*!
* Radio hardware registers initialization
*
* \remark RADIO_INIT_REGISTERS_VALUE is defined in sx1276-board.h file
*/
const RadioRegisters_t RadioRegsInit[] = RADIO_INIT_REGISTERS_VALUE;
/*!
* Constant values need to compute the RSSI value
*/
#define RSSI_OFFSET_LF -164
#define RSSI_OFFSET_HF -157
/*!
* Precomputed FSK bandwidth registers values
*/
const FskBandwidth_t FskBandwidths[] =
{
{ 2600 , 0x17 },
{ 3100 , 0x0F },
{ 3900 , 0x07 },
{ 5200 , 0x16 },
{ 6300 , 0x0E },
{ 7800 , 0x06 },
{ 10400 , 0x15 },
{ 12500 , 0x0D },
{ 15600 , 0x05 },
{ 20800 , 0x14 },
{ 25000 , 0x0C },
{ 31300 , 0x04 },
{ 41700 , 0x13 },
{ 50000 , 0x0B },
{ 62500 , 0x03 },
{ 83333 , 0x12 },
{ 100000, 0x0A },
{ 125000, 0x02 },
{ 166700, 0x11 },
{ 200000, 0x09 },
{ 250000, 0x01 },
{ 300000, 0x00 }, // Invalid Bandwidth
};
/*
* Private global variables
*/
/*!
* Radio callbacks variable
*/
static RadioEvents_t *RadioEvents;
/*!
* Reception buffer
*/
static uint8_t RxTxBuffer[RX_BUFFER_SIZE];
static LoRaBoardCallback_t *LoRaBoardCallbacks;
/*
* Public global variables
*/
/*!
* Radio hardware and global parameters
*/
SX1276_t SX1276;
/*!
* Hardware DIO IRQ callback initialization
*/
DioIrqHandler *DioIrq[] = { SX1276OnDio0Irq, SX1276OnDio1Irq,
SX1276OnDio2Irq, SX1276OnDio3Irq,
SX1276OnDio4Irq, NULL };
/*!
* Tx and Rx timers
*/
TimerEvent_t TxTimeoutTimer;
TimerEvent_t RxTimeoutTimer;
TimerEvent_t RxTimeoutSyncWord;
/*
* Radio driver functions implementation
*/
void SX1276BoardInit( LoRaBoardCallback_t *callbacks )
{
LOG_INFO_SX1276((">> SX1276BoardInit\r\n"));
LoRaBoardCallbacks =callbacks;
}
void SX1276DumpRegisters() {
log_info("Dump Sx1276 registers");
for ( uint8_t a = 0 ; a < 0x70 ; a++ ) {
if ( (a & 0x7) == 0 ) {
log_info("\r\n[0x%02X] ",a );
}
uint8_t v = SX1276Read( a );
log_info("%02X ",v);
}
log_info("\r\n");
}
uint32_t SX1276Init( RadioEvents_t * events )
{
LOG_INFO_SX1276((">> SX1276Init\r\n"));
uint8_t i;
RadioEvents = events;
// Initialize driver timeout timers
TimerInit( &TxTimeoutTimer, SX1276OnTimeoutIrq );
TimerInit( &RxTimeoutTimer, SX1276OnTimeoutIrq );
TimerInit( &RxTimeoutSyncWord, SX1276OnTimeoutIrq );
LoRaBoardCallbacks->SX1276BoardSetXO( SET );
SX1276Reset( );
RxChainCalibration( );
SX1276SetOpMode( RF_OPMODE_SLEEP );
LoRaBoardCallbacks->SX1276BoardIoIrqInit( DioIrq );
for( i = 0; i < sizeof( RadioRegsInit ) / sizeof( RadioRegisters_t ); i++ )
{
SX1276SetModem( RadioRegsInit[i].Modem );
SX1276Write( RadioRegsInit[i].Addr, RadioRegsInit[i].Value );
}
SX1276SetModem( MODEM_FSK );
SX1276.Settings.State = RF_IDLE;
return ( uint32_t )LoRaBoardCallbacks->SX1276BoardGetWakeTime( ) + ITSDK_MURATA_WAKEUP_TIME;// BOARD_WAKEUP_TIME;
}
RadioState_t SX1276GetStatus( void )
{
LOG_INFO_SX1276((">> SX1276GetStatus\r\n"));
return SX1276.Settings.State;
}
void SX1276SetChannel( uint32_t freq )
{
LOG_INFO_SX1276((">> SX1276SetChannel\r\n"));
uint32_t channel;
SX1276.Settings.Channel = freq;
SX_FREQ_TO_CHANNEL( channel, freq );
SX1276Write( REG_FRFMSB, ( uint8_t )( ( channel >> 16 ) & 0xFF ) );
SX1276Write( REG_FRFMID, ( uint8_t )( ( channel >> 8 ) & 0xFF ) );
SX1276Write( REG_FRFLSB, ( uint8_t )( channel & 0xFF ) );
}
bool SX1276IsChannelFree( RadioModems_t modem, uint32_t freq, int16_t rssiThresh, uint32_t maxCarrierSenseTime )
{
LOG_INFO_SX1276((">> SX1276IsChannelFree\r\n"));
bool status = true;
int16_t rssi = 0;
uint32_t carrierSenseTime = 0;
SX1276SetModem( modem );
SX1276SetChannel( freq );
SX1276SetOpMode( RF_OPMODE_RECEIVER );
DelayMs( 1 );
carrierSenseTime = TimerGetCurrentTime( );
// Perform carrier sense for maxCarrierSenseTime
while( TimerGetElapsedTime( carrierSenseTime ) < maxCarrierSenseTime )
{
rssi = SX1276ReadRssi( modem );
if( rssi > rssiThresh )
{
status = false;
break;
}
}
SX1276SetSleep( );
return status;
}
uint32_t SX1276Random( void )
{
LOG_INFO_SX1276((">> SX1276Random\r\n"));
uint8_t i;
uint32_t rnd = 0;
/*
* Radio setup for random number generation
*/
// Set LoRa modem ON
SX1276SetModem( MODEM_LORA );
// Disable LoRa modem interrupts
SX1276Write( REG_LR_IRQFLAGSMASK, RFLR_IRQFLAGS_RXTIMEOUT |
RFLR_IRQFLAGS_RXDONE |
RFLR_IRQFLAGS_PAYLOADCRCERROR |
RFLR_IRQFLAGS_VALIDHEADER |
RFLR_IRQFLAGS_TXDONE |
RFLR_IRQFLAGS_CADDONE |
RFLR_IRQFLAGS_FHSSCHANGEDCHANNEL |
RFLR_IRQFLAGS_CADDETECTED );
// Set radio in continuous reception
SX1276SetOpMode( RF_OPMODE_RECEIVER );
for( i = 0; i < 32; i++ )
{
DelayMs( 1 );
// Unfiltered RSSI value reading. Only takes the LSB value
rnd |= ( ( uint32_t )SX1276Read( REG_LR_RSSIWIDEBAND ) & 0x01 ) << i;
}
SX1276SetSleep( );
return rnd;
}
/*!
* 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 )
{
LOG_INFO_SX1276((">> RxChainCalibration\r\n"));
uint8_t regPaConfigInitVal;
uint32_t initialFreq;
uint32_t channel;
// Save context
regPaConfigInitVal = SX1276Read( REG_PACONFIG );
channel = ( ( ( uint32_t )SX1276Read( REG_FRFMSB ) << 16 ) |
( ( uint32_t )SX1276Read( REG_FRFMID ) << 8 ) |
( ( uint32_t )SX1276Read( REG_FRFLSB ) ) );
SX_CHANNEL_TO_FREQ(channel, initialFreq);
// Cut the PA just in case, RFO output, power = -1 dBm
SX1276Write( REG_PACONFIG, 0x00 );
// Launch Rx chain calibration for LF band
SX1276Write( REG_IMAGECAL, ( SX1276Read( REG_IMAGECAL ) & RF_IMAGECAL_IMAGECAL_MASK ) | RF_IMAGECAL_IMAGECAL_START );
while( ( SX1276Read( REG_IMAGECAL ) & RF_IMAGECAL_IMAGECAL_RUNNING ) == RF_IMAGECAL_IMAGECAL_RUNNING )
{
}
// Sets a Frequency in HF band
SX1276SetChannel( 868000000 );
// Launch Rx chain calibration for HF band
SX1276Write( REG_IMAGECAL, ( SX1276Read( REG_IMAGECAL ) & RF_IMAGECAL_IMAGECAL_MASK ) | RF_IMAGECAL_IMAGECAL_START );
while( ( SX1276Read( REG_IMAGECAL ) & RF_IMAGECAL_IMAGECAL_RUNNING ) == RF_IMAGECAL_IMAGECAL_RUNNING )
{
}
// Restore context
SX1276Write( REG_PACONFIG, regPaConfigInitVal );
SX1276SetChannel( initialFreq );
}
/*!
* 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 )
{
LOG_INFO_SX1276((">> GetFskBandwidthRegValue\r\n"));
uint8_t i;
for( i = 0; i < ( sizeof( FskBandwidths ) / sizeof( FskBandwidth_t ) ) - 1; i++ )
{
if( ( bandwidth >= FskBandwidths[i].bandwidth ) && ( bandwidth < FskBandwidths[i + 1].bandwidth ) )
{
return FskBandwidths[i].RegValue;
}
}
// ERROR: Value not found
while( 1 );
}
void SX1276SetRxConfig( 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 )
{
LOG_INFO_SX1276((">> SX1276SetRxConfig\r\n"));
SX1276SetModem( modem );
switch( modem )
{
case MODEM_FSK:
{
SX1276.Settings.Fsk.Bandwidth = bandwidth;
SX1276.Settings.Fsk.Datarate = datarate;
SX1276.Settings.Fsk.BandwidthAfc = bandwidthAfc;
SX1276.Settings.Fsk.FixLen = fixLen;
SX1276.Settings.Fsk.PayloadLen = payloadLen;
SX1276.Settings.Fsk.CrcOn = crcOn;
SX1276.Settings.Fsk.IqInverted = iqInverted;
SX1276.Settings.Fsk.RxContinuous = rxContinuous;
SX1276.Settings.Fsk.PreambleLen = preambleLen;
SX1276.Settings.Fsk.RxSingleTimeout = ( uint32_t )( symbTimeout * ( ( 1.0 / ( double )datarate ) * 8.0 ) * 1000 );
datarate = ( uint16_t )( ( double )XTAL_FREQ / ( double )datarate );
SX1276Write( REG_BITRATEMSB, ( uint8_t )( datarate >> 8 ) );
SX1276Write( REG_BITRATELSB, ( uint8_t )( datarate & 0xFF ) );
SX1276Write( REG_RXBW, GetFskBandwidthRegValue( bandwidth ) );
SX1276Write( REG_AFCBW, GetFskBandwidthRegValue( bandwidthAfc ) );
SX1276Write( REG_PREAMBLEMSB, ( uint8_t )( ( preambleLen >> 8 ) & 0xFF ) );
SX1276Write( REG_PREAMBLELSB, ( uint8_t )( preambleLen & 0xFF ) );
if( fixLen == 1 )
{
SX1276Write( REG_PAYLOADLENGTH, payloadLen );
}
else
{
SX1276Write( REG_PAYLOADLENGTH, 0xFF ); // Set payload length to the maximum
}
SX1276Write( REG_PACKETCONFIG1,
( SX1276Read( REG_PACKETCONFIG1 ) &
RF_PACKETCONFIG1_CRC_MASK &
RF_PACKETCONFIG1_PACKETFORMAT_MASK ) |
( ( fixLen == 1 ) ? RF_PACKETCONFIG1_PACKETFORMAT_FIXED : RF_PACKETCONFIG1_PACKETFORMAT_VARIABLE ) |
( crcOn << 4 ) );
SX1276Write( REG_PACKETCONFIG2, ( SX1276Read( REG_PACKETCONFIG2 ) | RF_PACKETCONFIG2_DATAMODE_PACKET ) );
}
break;
case MODEM_LORA:
{
if( bandwidth > 2 )
{
// Fatal error: When using LoRa modem only bandwidths 125, 250 and 500 kHz are supported
while( 1 );
}
bandwidth += 7;
SX1276.Settings.LoRa.Bandwidth = bandwidth;
SX1276.Settings.LoRa.Datarate = datarate;
SX1276.Settings.LoRa.Coderate = coderate;
SX1276.Settings.LoRa.PreambleLen = preambleLen;
SX1276.Settings.LoRa.FixLen = fixLen;
SX1276.Settings.LoRa.PayloadLen = payloadLen;
SX1276.Settings.LoRa.CrcOn = crcOn;
SX1276.Settings.LoRa.FreqHopOn = freqHopOn;
SX1276.Settings.LoRa.HopPeriod = hopPeriod;
SX1276.Settings.LoRa.IqInverted = iqInverted;
SX1276.Settings.LoRa.RxContinuous = rxContinuous;
if( datarate > 12 )
{
datarate = 12;
}
else if( datarate < 6 )
{
datarate = 6;
}
if( ( ( bandwidth == 7 ) && ( ( datarate == 11 ) || ( datarate == 12 ) ) ) ||
( ( bandwidth == 8 ) && ( datarate == 12 ) ) )
{
SX1276.Settings.LoRa.LowDatarateOptimize = 0x01;
}
else
{
SX1276.Settings.LoRa.LowDatarateOptimize = 0x00;
}
SX1276Write( REG_LR_MODEMCONFIG1,
( SX1276Read( REG_LR_MODEMCONFIG1 ) &
RFLR_MODEMCONFIG1_BW_MASK &
RFLR_MODEMCONFIG1_CODINGRATE_MASK &
RFLR_MODEMCONFIG1_IMPLICITHEADER_MASK ) |
( bandwidth << 4 ) | ( coderate << 1 ) |
fixLen );
SX1276Write( REG_LR_MODEMCONFIG2,
( SX1276Read( REG_LR_MODEMCONFIG2 ) &
RFLR_MODEMCONFIG2_SF_MASK &
RFLR_MODEMCONFIG2_RXPAYLOADCRC_MASK &
RFLR_MODEMCONFIG2_SYMBTIMEOUTMSB_MASK ) |
( datarate << 4 ) | ( crcOn << 2 ) |
( ( symbTimeout >> 8 ) & ~RFLR_MODEMCONFIG2_SYMBTIMEOUTMSB_MASK ) );
SX1276Write( REG_LR_MODEMCONFIG3,
( SX1276Read( REG_LR_MODEMCONFIG3 ) &
RFLR_MODEMCONFIG3_LOWDATARATEOPTIMIZE_MASK ) |
( SX1276.Settings.LoRa.LowDatarateOptimize << 3 ) );
SX1276Write( REG_LR_SYMBTIMEOUTLSB, ( uint8_t )( symbTimeout & 0xFF ) );
SX1276Write( REG_LR_PREAMBLEMSB, ( uint8_t )( ( preambleLen >> 8 ) & 0xFF ) );
SX1276Write( REG_LR_PREAMBLELSB, ( uint8_t )( preambleLen & 0xFF ) );
if( fixLen == 1 )
{
SX1276Write( REG_LR_PAYLOADLENGTH, payloadLen );
}
if( SX1276.Settings.LoRa.FreqHopOn == true )
{
SX1276Write( REG_LR_PLLHOP, ( SX1276Read( REG_LR_PLLHOP ) & RFLR_PLLHOP_FASTHOP_MASK ) | RFLR_PLLHOP_FASTHOP_ON );
SX1276Write( REG_LR_HOPPERIOD, SX1276.Settings.LoRa.HopPeriod );
}
if( ( bandwidth == 9 ) && ( SX1276.Settings.Channel > RF_MID_BAND_THRESH ) )
{
// ERRATA 2.1 - Sensitivity Optimization with a 500 kHz Bandwidth
SX1276Write( REG_LR_HIGHBWOPTIMIZE1, 0x02 );
SX1276Write( REG_LR_HIGHBWOPTIMIZE2, 0x64 );
}
else if( bandwidth == 9 )
{
// ERRATA 2.1 - Sensitivity Optimization with a 500 kHz Bandwidth
SX1276Write( REG_LR_HIGHBWOPTIMIZE1, 0x02 );
SX1276Write( REG_LR_HIGHBWOPTIMIZE2, 0x7F );
}
else
{
// ERRATA 2.1 - Sensitivity Optimization with a 500 kHz Bandwidth
SX1276Write( REG_LR_HIGHBWOPTIMIZE1, 0x03 );
}
if( datarate == 6 )
{
SX1276Write( REG_LR_DETECTOPTIMIZE,
( SX1276Read( REG_LR_DETECTOPTIMIZE ) &
RFLR_DETECTIONOPTIMIZE_MASK ) |
RFLR_DETECTIONOPTIMIZE_SF6 );
SX1276Write( REG_LR_DETECTIONTHRESHOLD,
RFLR_DETECTIONTHRESH_SF6 );
}
else
{
SX1276Write( REG_LR_DETECTOPTIMIZE,
( SX1276Read( REG_LR_DETECTOPTIMIZE ) &
RFLR_DETECTIONOPTIMIZE_MASK ) |
RFLR_DETECTIONOPTIMIZE_SF7_TO_SF12 );
SX1276Write( REG_LR_DETECTIONTHRESHOLD,
RFLR_DETECTIONTHRESH_SF7_TO_SF12 );
}
}
break;
}
}
void SX1276SetTxConfig( 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 )
{
LOG_INFO_SX1276((">> SX1276SetTxConfig\r\n"));
SX1276SetModem( modem );
LoRaBoardCallbacks->SX1276BoardSetRfTxPower( power );
switch( modem )
{
case MODEM_FSK:
{
SX1276.Settings.Fsk.Power = power;
SX1276.Settings.Fsk.Fdev = fdev;
SX1276.Settings.Fsk.Bandwidth = bandwidth;
SX1276.Settings.Fsk.Datarate = datarate;
SX1276.Settings.Fsk.PreambleLen = preambleLen;
SX1276.Settings.Fsk.FixLen = fixLen;
SX1276.Settings.Fsk.CrcOn = crcOn;
SX1276.Settings.Fsk.IqInverted = iqInverted;
SX1276.Settings.Fsk.TxTimeout = timeout;
fdev = ( uint16_t )( ( double )fdev / ( double )FREQ_STEP );
SX1276Write( REG_FDEVMSB, ( uint8_t )( fdev >> 8 ) );
SX1276Write( REG_FDEVLSB, ( uint8_t )( fdev & 0xFF ) );
datarate = ( uint16_t )( ( double )XTAL_FREQ / ( double )datarate );
SX1276Write( REG_BITRATEMSB, ( uint8_t )( datarate >> 8 ) );
SX1276Write( REG_BITRATELSB, ( uint8_t )( datarate & 0xFF ) );
SX1276Write( REG_PREAMBLEMSB, ( preambleLen >> 8 ) & 0x00FF );
SX1276Write( REG_PREAMBLELSB, preambleLen & 0xFF );
SX1276Write( REG_PACKETCONFIG1,
( SX1276Read( REG_PACKETCONFIG1 ) &
RF_PACKETCONFIG1_CRC_MASK &
RF_PACKETCONFIG1_PACKETFORMAT_MASK ) |
( ( fixLen == 1 ) ? RF_PACKETCONFIG1_PACKETFORMAT_FIXED : RF_PACKETCONFIG1_PACKETFORMAT_VARIABLE ) |
( crcOn << 4 ) );
SX1276Write( REG_PACKETCONFIG2, ( SX1276Read( REG_PACKETCONFIG2 ) | RF_PACKETCONFIG2_DATAMODE_PACKET ) );
}
break;
case MODEM_LORA:
{
SX1276.Settings.LoRa.Power = power;
if( bandwidth > 2 )
{
// Fatal error: When using LoRa modem only bandwidths 125, 250 and 500 kHz are supported
while( 1 );
}
bandwidth += 7;
SX1276.Settings.LoRa.Bandwidth = bandwidth;
SX1276.Settings.LoRa.Datarate = datarate;
SX1276.Settings.LoRa.Coderate = coderate;
SX1276.Settings.LoRa.PreambleLen = preambleLen;
SX1276.Settings.LoRa.FixLen = fixLen;
SX1276.Settings.LoRa.FreqHopOn = freqHopOn;
SX1276.Settings.LoRa.HopPeriod = hopPeriod;
SX1276.Settings.LoRa.CrcOn = crcOn;
SX1276.Settings.LoRa.IqInverted = iqInverted;
SX1276.Settings.LoRa.TxTimeout = timeout;
if( datarate > 12 )
{
datarate = 12;
}
else if( datarate < 6 )
{
datarate = 6;
}
if( ( ( bandwidth == 7 ) && ( ( datarate == 11 ) || ( datarate == 12 ) ) ) ||
( ( bandwidth == 8 ) && ( datarate == 12 ) ) )
{
SX1276.Settings.LoRa.LowDatarateOptimize = 0x01;
}
else
{
SX1276.Settings.LoRa.LowDatarateOptimize = 0x00;
}
if( SX1276.Settings.LoRa.FreqHopOn == true )
{
SX1276Write( REG_LR_PLLHOP, ( SX1276Read( REG_LR_PLLHOP ) & RFLR_PLLHOP_FASTHOP_MASK ) | RFLR_PLLHOP_FASTHOP_ON );
SX1276Write( REG_LR_HOPPERIOD, SX1276.Settings.LoRa.HopPeriod );
}
SX1276Write( REG_LR_MODEMCONFIG1,
( SX1276Read( REG_LR_MODEMCONFIG1 ) &
RFLR_MODEMCONFIG1_BW_MASK &
RFLR_MODEMCONFIG1_CODINGRATE_MASK &
RFLR_MODEMCONFIG1_IMPLICITHEADER_MASK ) |
( bandwidth << 4 ) | ( coderate << 1 ) |
fixLen );
SX1276Write( REG_LR_MODEMCONFIG2,
( SX1276Read( REG_LR_MODEMCONFIG2 ) &
RFLR_MODEMCONFIG2_SF_MASK &
RFLR_MODEMCONFIG2_RXPAYLOADCRC_MASK ) |
( datarate << 4 ) | ( crcOn << 2 ) );
SX1276Write( REG_LR_MODEMCONFIG3,
( SX1276Read( REG_LR_MODEMCONFIG3 ) &
RFLR_MODEMCONFIG3_LOWDATARATEOPTIMIZE_MASK ) |
( SX1276.Settings.LoRa.LowDatarateOptimize << 3 ) );
SX1276Write( REG_LR_PREAMBLEMSB, ( preambleLen >> 8 ) & 0x00FF );
SX1276Write( REG_LR_PREAMBLELSB, preambleLen & 0xFF );
if( datarate == 6 )
{
SX1276Write( REG_LR_DETECTOPTIMIZE,
( SX1276Read( REG_LR_DETECTOPTIMIZE ) &
RFLR_DETECTIONOPTIMIZE_MASK ) |
RFLR_DETECTIONOPTIMIZE_SF6 );
SX1276Write( REG_LR_DETECTIONTHRESHOLD,
RFLR_DETECTIONTHRESH_SF6 );
}
else
{
SX1276Write( REG_LR_DETECTOPTIMIZE,
( SX1276Read( REG_LR_DETECTOPTIMIZE ) &
RFLR_DETECTIONOPTIMIZE_MASK ) |
RFLR_DETECTIONOPTIMIZE_SF7_TO_SF12 );
SX1276Write( REG_LR_DETECTIONTHRESHOLD,
RFLR_DETECTIONTHRESH_SF7_TO_SF12 );
}
}
break;
}
}
uint32_t SX1276GetTimeOnAir( RadioModems_t modem, uint8_t pktLen )
{
LOG_INFO_SX1276((">> SX1276GetTimeOnAir\r\n"));
uint32_t airTime = 0;
switch( modem )
{
case MODEM_FSK:
{
airTime = (uint32_t) round( ( 8 * ( SX1276.Settings.Fsk.PreambleLen +
( ( SX1276Read( REG_SYNCCONFIG ) & ~RF_SYNCCONFIG_SYNCSIZE_MASK ) + 1 ) +
( ( SX1276.Settings.Fsk.FixLen == 0x01 ) ? 0.0 : 1.0 ) +
( ( ( SX1276Read( REG_PACKETCONFIG1 ) & ~RF_PACKETCONFIG1_ADDRSFILTERING_MASK ) != 0x00 ) ? 1.0 : 0 ) +
pktLen +
( ( SX1276.Settings.Fsk.CrcOn == 0x01 ) ? 2.0 : 0 ) ) /
SX1276.Settings.Fsk.Datarate ) * 1000 );
}
break;
case MODEM_LORA:
{
double bw = 0.0;
// REMARK: When using LoRa modem only bandwidths 125, 250 and 500 kHz are supported
switch( SX1276.Settings.LoRa.Bandwidth )
{
//case 0: // 7.8 kHz
// bw = 7800;
// break;
//case 1: // 10.4 kHz
// bw = 10400;
// break;
//case 2: // 15.6 kHz
// bw = 15600;
// break;
//case 3: // 20.8 kHz
// bw = 20800;
// break;
//case 4: // 31.2 kHz
// bw = 31200;
// break;
//case 5: // 41.4 kHz
// bw = 41400;
// break;
//case 6: // 62.5 kHz
// bw = 62500;
// break;
case 7: // 125 kHz
bw = 125000;
break;
case 8: // 250 kHz
bw = 250000;
break;
case 9: // 500 kHz
bw = 500000;
break;
}
// Symbol rate : time for one symbol (secs)
double rs = bw / ( 1 << SX1276.Settings.LoRa.Datarate );
double ts = 1 / rs;
// time of preamble
double tPreamble = ( SX1276.Settings.LoRa.PreambleLen + 4.25 ) * ts;
// Symbol length of payload and time
double tmp = ceil( ( 8 * pktLen - 4 * SX1276.Settings.LoRa.Datarate +
28 + 16 * SX1276.Settings.LoRa.CrcOn -
( SX1276.Settings.LoRa.FixLen ? 20 : 0 ) ) /
( double )( 4 * ( SX1276.Settings.LoRa.Datarate -
( ( SX1276.Settings.LoRa.LowDatarateOptimize > 0 ) ? 2 : 0 ) ) ) ) *
( SX1276.Settings.LoRa.Coderate + 4 );
double nPayload = 8 + ( ( tmp > 0 ) ? tmp : 0 );
double tPayload = nPayload * ts;
// Time on air
double tOnAir = tPreamble + tPayload;
// return ms secs
airTime = (uint32_t) floor( tOnAir * 1000 + 0.999 );
}
break;
}
return airTime;
}
void SX1276Send( uint8_t *buffer, uint8_t size )
{
LOG_INFO_SX1276((">> SX1276Send %d bytes\r\n",size));
uint32_t txTimeout = 0;
switch( SX1276.Settings.Modem )
{
case MODEM_FSK:
{
SX1276.Settings.FskPacketHandler.NbBytes = 0;
SX1276.Settings.FskPacketHandler.Size = size;
if( SX1276.Settings.Fsk.FixLen == false )
{
SX1276WriteFifo( ( uint8_t* )&size, 1 );
}
else
{
SX1276Write( REG_PAYLOADLENGTH, size );
}
if( ( size > 0 ) && ( size <= 64 ) )
{
SX1276.Settings.FskPacketHandler.ChunkSize = size;
}
else
{
memcpy1( RxTxBuffer, buffer, size );
SX1276.Settings.FskPacketHandler.ChunkSize = 32;
}
// Write payload buffer
SX1276WriteFifo( buffer, SX1276.Settings.FskPacketHandler.ChunkSize );
SX1276.Settings.FskPacketHandler.NbBytes += SX1276.Settings.FskPacketHandler.ChunkSize;
txTimeout = SX1276.Settings.Fsk.TxTimeout;
}
break;
case MODEM_LORA:
{
if( SX1276.Settings.LoRa.IqInverted == true )
{
SX1276Write( REG_LR_INVERTIQ, ( ( SX1276Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_OFF | RFLR_INVERTIQ_TX_ON ) );
SX1276Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_ON );
}
else
{
SX1276Write( REG_LR_INVERTIQ, ( ( SX1276Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_OFF | RFLR_INVERTIQ_TX_OFF ) );
SX1276Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_OFF );
}
SX1276.Settings.LoRaPacketHandler.Size = size;
// Initializes the payload size
SX1276Write( REG_LR_PAYLOADLENGTH, size );
// Full buffer used for Tx
SX1276Write( REG_LR_FIFOTXBASEADDR, 0 );
SX1276Write( REG_LR_FIFOADDRPTR, 0 );
// FIFO operations can not take place in Sleep mode
if( ( SX1276Read( REG_OPMODE ) & ~RF_OPMODE_MASK ) == RF_OPMODE_SLEEP )
{
SX1276SetStby( );
DelayMs( 1 );
}
// Write payload buffer
SX1276WriteFifo( buffer, size );
txTimeout = SX1276.Settings.LoRa.TxTimeout;
}
break;
}
SX1276SetTx( txTimeout );
}
void SX1276SetSleep( void )
{
LOG_INFO_SX1276((">> SX1276SetSleep\r\n"));
TimerStop( &RxTimeoutTimer );
TimerStop( &TxTimeoutTimer );
SX1276SetOpMode( RF_OPMODE_SLEEP );
SX1276.Settings.State = RF_IDLE;
}
void SX1276SetStby( void )
{
LOG_INFO_SX1276((">> SX1276SetStby\r\n"));
TimerStop( &RxTimeoutTimer );
TimerStop( &TxTimeoutTimer );
SX1276SetOpMode( RF_OPMODE_STANDBY );
SX1276.Settings.State = RF_IDLE;
}
void SX1276SetRx( uint32_t timeout )
{
LOG_INFO_SX1276((">> SX1276SetRx (%d)\r\n",timeout));
bool rxContinuous = false;
switch( SX1276.Settings.Modem )
{
case MODEM_FSK:
{
rxContinuous = SX1276.Settings.Fsk.RxContinuous;
// DIO0=PayloadReady
// DIO1=FifoLevel
// DIO2=SyncAddr
// DIO3=FifoEmpty
// DIO4=Preamble
// DIO5=ModeReady
SX1276Write( REG_DIOMAPPING1, ( SX1276Read( REG_DIOMAPPING1 ) & RF_DIOMAPPING1_DIO0_MASK &
RF_DIOMAPPING1_DIO1_MASK &
RF_DIOMAPPING1_DIO2_MASK ) |
RF_DIOMAPPING1_DIO0_00 |
RF_DIOMAPPING1_DIO1_00 |
RF_DIOMAPPING1_DIO2_11 );
SX1276Write( REG_DIOMAPPING2, ( SX1276Read( REG_DIOMAPPING2 ) & RF_DIOMAPPING2_DIO4_MASK &
RF_DIOMAPPING2_MAP_MASK ) |
RF_DIOMAPPING2_DIO4_11 |
RF_DIOMAPPING2_MAP_PREAMBLEDETECT );
SX1276.Settings.FskPacketHandler.FifoThresh = SX1276Read( REG_FIFOTHRESH ) & 0x3F;
SX1276Write( REG_RXCONFIG, RF_RXCONFIG_AFCAUTO_ON | RF_RXCONFIG_AGCAUTO_ON | RF_RXCONFIG_RXTRIGER_PREAMBLEDETECT );
SX1276.Settings.FskPacketHandler.PreambleDetected = false;
SX1276.Settings.FskPacketHandler.SyncWordDetected = false;
SX1276.Settings.FskPacketHandler.NbBytes = 0;
SX1276.Settings.FskPacketHandler.Size = 0;
}
break;
case MODEM_LORA:
{
if( SX1276.Settings.LoRa.IqInverted == true )
{
SX1276Write( REG_LR_INVERTIQ, ( ( SX1276Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_ON | RFLR_INVERTIQ_TX_OFF ) );
SX1276Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_ON );
}
else
{
SX1276Write( REG_LR_INVERTIQ, ( ( SX1276Read( REG_LR_INVERTIQ ) & RFLR_INVERTIQ_TX_MASK & RFLR_INVERTIQ_RX_MASK ) | RFLR_INVERTIQ_RX_OFF | RFLR_INVERTIQ_TX_OFF ) );
SX1276Write( REG_LR_INVERTIQ2, RFLR_INVERTIQ2_OFF );
}
// ERRATA 2.3 - Receiver Spurious Reception of a LoRa Signal
if( SX1276.Settings.LoRa.Bandwidth < 9 )
{
SX1276Write( REG_LR_DETECTOPTIMIZE, SX1276Read( REG_LR_DETECTOPTIMIZE ) & 0x7F );
SX1276Write( REG_LR_IFFREQ2, 0x00 );
switch( SX1276.Settings.LoRa.Bandwidth )
{
case 0: // 7.8 kHz
SX1276Write( REG_LR_IFFREQ1, 0x48 );