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sx1276.c
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sx1276.c
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// Based on https://github.com/apache/mynewt-core/blob/master/hw/drivers/lora/sx1276/src/sx1276.c
/*
/ _____) _ | |
( (____ _____ ____ _| |_ _____ ____| |__
\____ \| ___ | (_ _) ___ |/ ___) _ \
_____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
(C)2013 Semtech
Description: Generic SX1276 driver implementation
License: Revised BSD License, see LICENSE.TXT file include in the project
Maintainer: Miguel Luis, Gregory Cristian and Wael Guibene
*/
#include <assert.h>
#include <math.h>
#include <string.h>
#include <device/vfs_spi.h> // For spi_ioc_transfer_t
#include <hal/soc/spi.h> // For hal_spi_transfer
#include <hal_spi.h> // For spi_init
#include <bl_gpio.h> // For bl_gpio_output_set
#include <bl602_glb.h> // For GLB_GPIO_Func_Init
#include "radio.h"
#include "sx1276.h"
#include "sx1276-board.h"
#include "utilities.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
*/
/*!
* 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
*/
static void RxChainCalibration(void);
/*!
* \brief Resets the SX1276
*/
void SX1276Reset(void);
/*!
* \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 *unused);
/*!
* \brief DIO 1 IRQ callback
*/
void SX1276OnDio1Irq(void *unused);
/*!
* \brief DIO 2 IRQ callback
*/
void SX1276OnDio2Irq(void *unused);
/*!
* \brief DIO 3 IRQ callback
*/
void SX1276OnDio3Irq(void *unused);
/*!
* \brief DIO 4 IRQ callback
*/
void SX1276OnDio4Irq(void *unused);
/*!
* \brief DIO 5 IRQ callback
*/
void SX1276OnDio5Irq(void *unused);
/*!
* \brief Tx & Rx timeout timer callback
*/
void SX1276OnTimeoutIrq(void *unused);
/*
* 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];
/*
* Public global variables
*/
/*!
* Radio hardware and global parameters
*/
SX1276_t SX1276;
/*!
* Hardware DIO IRQ callback initialization
*/
DioIrqHandler *DioIrq[] = { SX1276OnDio0Irq, SX1276OnDio1Irq,
SX1276OnDio2Irq, SX1276OnDio3Irq,
SX1276OnDio4Irq, NULL };
struct hal_timer {}; //// TODO
/*!
* Tx and Rx timers
*/
struct hal_timer TxTimeoutTimer;
struct hal_timer RxTimeoutTimer;
struct hal_timer RxTimeoutSyncWord;
static uint32_t rx_timeout_sync_delay = -1;
///////////////////////////////////////////////////////////////////////////////
// Timer Functions
void os_cputime_timer_init(struct hal_timer *timer, void f(void *), void *arg) {
// TODO
}
/// Delay for the specified number of microseconds
void os_cputime_delay_usecs(uint32_t microsecs) {
// TODO
printf("TODO: os_cputime_delay_usecs %u\r\n", microsecs);
}
void os_cputime_timer_stop(struct hal_timer *timer) {
// TODO
}
void os_cputime_timer_relative(struct hal_timer *timer, uint32_t microsecs) {
// TODO
}
///////////////////////////////////////////////////////////////////////////////
// SPI Functions
/// SPI Device Instance. TODO: Move to sx1276.h
extern spi_dev_t spi_device;
/// SPI Transmit Buffer (1 byte)
static uint8_t spi_tx_buf[1];
/// SPI Receive Buffer (1 byte)
static uint8_t spi_rx_buf[1];
/// Blocking call to send a value on the SPI. Returns the value received from the SPI Peripheral.
/// Assume that we are sending and receiving 8-bit values on SPI.
/// Assume Chip Select Pin has already been set to Low by caller.
uint16_t hal_spi_tx_val(int spi_num, uint16_t val) {
// Populate the transmit buffer
spi_tx_buf[0] = val;
// Clear the receive buffer
memset(&spi_rx_buf, 0, sizeof(spi_rx_buf));
// Prepare SPI Transfer
static spi_ioc_transfer_t transfer;
memset(&transfer, 0, sizeof(transfer));
transfer.tx_buf = (uint32_t) spi_tx_buf; // Transmit Buffer
transfer.rx_buf = (uint32_t) spi_rx_buf; // Receive Buffer
transfer.len = 1; // How many bytes
// Assume Chip Select Pin has already been set to Low by caller.
// Execute the SPI Transfer with the DMA Controller
int rc = hal_spi_transfer(
&spi_device, // SPI Device
&transfer, // SPI Transfers
1 // How many transfers (Number of requests, not bytes)
);
assert(rc == 0);
// Return the received byte
return spi_rx_buf[0];
}
///////////////////////////////////////////////////////////////////////////////
// Driver Functions
double
ceil(double d)
{
int64_t i;
i = d;
if (d == i) {
return i;
}
return i + 1;
}
double
floor(double d)
{
return (int64_t)d;
}
double
round(double d)
{
return (int64_t)(d + 0.5);
}
static void
SX1276RxDone(uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
{
if ((RadioEvents != NULL) && (RadioEvents->RxDone != NULL)) {
RadioEvents->RxDone(payload, size, rssi, snr);
}
}
static void
SX1276RxError(void)
{
if ((RadioEvents != NULL) && (RadioEvents->RxError != NULL)) {
RadioEvents->RxError();
}
}
static void
SX1276RxTimeout(void)
{
if ((RadioEvents != NULL) && (RadioEvents->RxTimeout != NULL)) {
RadioEvents->RxTimeout();
}
}
static void
SX1276TxDone(void)
{
if ((RadioEvents != NULL) && (RadioEvents->TxDone != NULL)) {
RadioEvents->TxDone();
}
}
static void
SX1276TxTimeout(void)
{
if ((RadioEvents != NULL) && (RadioEvents->TxTimeout != NULL)) {
RadioEvents->TxTimeout();
}
}
/*
* Radio driver functions implementation
*/
void
SX1276Init(RadioEvents_t *events)
{
uint8_t i;
RadioEvents = events;
// Initialize driver timeout timers. NOTE: assumes timer configured.
os_cputime_timer_init(&TxTimeoutTimer, SX1276OnTimeoutIrq, NULL);
os_cputime_timer_init(&RxTimeoutTimer, SX1276OnTimeoutIrq, NULL);
os_cputime_timer_init(&RxTimeoutSyncWord, SX1276OnTimeoutIrq, NULL);
SX1276IoInit();
SX1276IoIrqInit(DioIrq);
SX1276Reset();
RxChainCalibration();
SX1276SetOpMode(RF_OPMODE_SLEEP);
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;
}
RadioState_t
SX1276GetStatus(void)
{
return SX1276.Settings.State;
}
void
SX1276SetChannel(uint32_t freq)
{
SX1276.Settings.Channel = freq;
freq = (uint32_t)((double)freq / (double)FREQ_STEP);
SX1276Write(REG_FRFMSB, (uint8_t)((freq >> 16) & 0xFF));
SX1276Write(REG_FRFMID, (uint8_t)((freq >> 8) & 0xFF));
SX1276Write(REG_FRFLSB, (uint8_t)(freq & 0xFF));
}
bool
SX1276IsChannelFree(RadioModems_t modem, uint32_t freq, int16_t rssiThresh,
uint32_t maxCarrierSenseTime)
{
bool status = true;
int16_t rssi;
uint32_t carrierSenseTime;
SX1276SetModem(modem);
SX1276SetChannel(freq);
SX1276SetOpMode(RF_OPMODE_RECEIVER);
/* Delay for 1 msec */
os_cputime_delay_usecs(1000);
carrierSenseTime = timer_get_current_time();
// Perform carrier sense for maxCarrierSenseTime
while (timer_get_elapsed_time(carrierSenseTime) < maxCarrierSenseTime) {
rssi = SX1276ReadRssi(modem);
if (rssi > rssiThresh) {
status = false;
break;
}
}
SX1276SetSleep();
return status;
}
uint32_t
SX1276Random(void)
{
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++) {
os_cputime_delay_usecs(1000);
// 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
*/
static void
RxChainCalibration(void)
{
uint8_t regPaConfigInitVal;
uint32_t initialFreq;
// Save context
regPaConfigInitVal = SX1276Read(REG_PACONFIG);
initialFreq = (double)(((uint32_t)SX1276Read(REG_FRFMSB) << 16) |
((uint32_t)SX1276Read(REG_FRFMID) << 8) |
((uint32_t)SX1276Read(REG_FRFLSB))) * (double)FREQ_STEP;
// 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)
{
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)
{
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;
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));
break;
case MODEM_LORA:
// Fatal error: When using LoRa modem only bandwidths 125, 250 and 500 kHz are supported
assert(bandwidth <= 2);
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;
/* XXX: why is this done? Why not an error? */
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_TEST36, 0x02);
SX1276Write(REG_LR_TEST3A, 0x64);
} else if (bandwidth == 9) {
// ERRATA 2.1 - Sensitivity Optimization with a 500 kHz Bandwidth
SX1276Write(REG_LR_TEST36, 0x02);
SX1276Write(REG_LR_TEST3A, 0x7F);
} else {
// ERRATA 2.1 - Sensitivity Optimization with a 500 kHz Bandwidth
SX1276Write(REG_LR_TEST36, 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)
{
uint8_t paConfig;
uint8_t paDac;
SX1276SetModem(modem);
paConfig = SX1276Read(REG_PACONFIG);
paDac = SX1276Read(REG_PADAC);
paConfig = (paConfig & RF_PACONFIG_PASELECT_MASK) | SX1276GetPaSelect(SX1276.Settings.Channel);
paConfig = (paConfig & RF_PACONFIG_MAX_POWER_MASK) | 0x70;
if ((paConfig & RF_PACONFIG_PASELECT_PABOOST) == RF_PACONFIG_PASELECT_PABOOST) {
if (power > 17) {
paDac = (paDac & RF_PADAC_20DBM_MASK) | RF_PADAC_20DBM_ON;
} else {
paDac = (paDac & RF_PADAC_20DBM_MASK) | RF_PADAC_20DBM_OFF;
}
if ((paDac & RF_PADAC_20DBM_ON) == RF_PADAC_20DBM_ON) {
if (power < 5) {
power = 5;
}
if (power > 20) {
power = 20;
}
paConfig = (paConfig & RF_PACONFIG_OUTPUTPOWER_MASK) | (uint8_t)((uint16_t)(power - 5) & 0x0F);
} else {
if (power < 2) {
power = 2;
}
if (power > 17) {
power = 17;
}
paConfig = (paConfig & RF_PACONFIG_OUTPUTPOWER_MASK) | (uint8_t)((uint16_t)(power - 2) & 0x0F);
}
} else {
if (power < -1) {
power = -1;
}
if (power > 14) {
power = 14;
}
paConfig = (paConfig & RF_PACONFIG_OUTPUTPOWER_MASK) | (uint8_t)((uint16_t)(power + 1) & 0x0F);
}
SX1276Write(REG_PACONFIG, paConfig);
SX1276Write(REG_PADAC, paDac);
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));
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)
{
uint32_t airtime;
double bw;
switch (modem) {
case MODEM_FSK:
airtime = 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) * 1e3);
break;
case MODEM_LORA:
// 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 = 78e2;
// break;
//case 1: // 10.4 kHz
// bw = 104e2;
// break;
//case 2: // 15.6 kHz
// bw = 156e2;
// break;
//case 3: // 20.8 kHz
// bw = 208e2;
// break;
//case 4: // 31.2 kHz
// bw = 312e2;
// break;
//case 5: // 41.4 kHz
// bw = 414e2;
// break;
//case 6: // 62.5 kHz
// bw = 625e2;
// break;
case 7: // 125 kHz
bw = 125000;
break;
case 8: // 250 kHz
bw = 250000;
break;
case 9: // 500 kHz
bw = 500000;
break;
default:
bw = 0;
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 = floor(tOnAir * 1000 + 0.999);
break;
default:
airtime = 0;
break;
}
return airtime;
}
void
SX1276Send(uint8_t *buffer, uint8_t 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{
memcpy(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();
os_cputime_delay_usecs(1000);
}
// Write payload buffer
SX1276WriteFifo(buffer, size);
txTimeout = SX1276.Settings.LoRa.TxTimeout;
break;
}
SX1276SetTx(txTimeout);
}
void
SX1276SetSleep(void)
{
os_cputime_timer_stop(&RxTimeoutTimer);
os_cputime_timer_stop(&TxTimeoutTimer);
SX1276SetOpMode(RF_OPMODE_SLEEP);
SX1276.Settings.State = RF_IDLE;
}
void
SX1276SetStby(void)
{
os_cputime_timer_stop(&RxTimeoutTimer);
os_cputime_timer_stop(&TxTimeoutTimer);
SX1276SetOpMode(RF_OPMODE_STANDBY);
SX1276.Settings.State = RF_IDLE;
}
void
SX1276SetRx(uint32_t timeout)
{
bool rxcontinuous = false;