724 lines
16 KiB
C++
724 lines
16 KiB
C++
// Copyright (c) Sandeep Mistry. All rights reserved.
|
|
// Licensed under the MIT license.
|
|
|
|
// Modifications and additions copyright 2023 by Mark Qvist
|
|
// Obviously still under the MIT license.
|
|
|
|
#include "LoRa.h"
|
|
|
|
#define MCU_1284P 0x91
|
|
#define MCU_2560 0x92
|
|
#define MCU_ESP32 0x81
|
|
#if defined(__AVR_ATmega1284P__)
|
|
#define PLATFORM PLATFORM_AVR
|
|
#define MCU_VARIANT MCU_1284P
|
|
#elif defined(__AVR_ATmega2560__)
|
|
#define PLATFORM PLATFORM_AVR
|
|
#define MCU_VARIANT MCU_2560
|
|
#elif defined(ESP32)
|
|
#define PLATFORM PLATFORM_ESP32
|
|
#define MCU_VARIANT MCU_ESP32
|
|
#endif
|
|
|
|
#ifndef MCU_VARIANT
|
|
#error No MCU variant defined, cannot compile
|
|
#endif
|
|
|
|
#if MCU_VARIANT == MCU_ESP32
|
|
#include "soc/rtc_wdt.h"
|
|
#define ISR_VECT IRAM_ATTR
|
|
#else
|
|
#define ISR_VECT
|
|
#endif
|
|
|
|
// Registers
|
|
#define REG_FIFO 0x00
|
|
#define REG_OP_MODE 0x01
|
|
#define REG_FRF_MSB 0x06
|
|
#define REG_FRF_MID 0x07
|
|
#define REG_FRF_LSB 0x08
|
|
#define REG_PA_CONFIG 0x09
|
|
#define REG_OCP 0x0b
|
|
#define REG_LNA 0x0c
|
|
#define REG_FIFO_ADDR_PTR 0x0d
|
|
#define REG_FIFO_TX_BASE_ADDR 0x0e
|
|
#define REG_FIFO_RX_BASE_ADDR 0x0f
|
|
#define REG_FIFO_RX_CURRENT_ADDR 0x10
|
|
#define REG_IRQ_FLAGS 0x12
|
|
#define REG_RX_NB_BYTES 0x13
|
|
#define REG_MODEM_STAT 0x18
|
|
#define REG_PKT_SNR_VALUE 0x19
|
|
#define REG_PKT_RSSI_VALUE 0x1a
|
|
#define REG_RSSI_VALUE 0x1b
|
|
#define REG_MODEM_CONFIG_1 0x1d
|
|
#define REG_MODEM_CONFIG_2 0x1e
|
|
#define REG_PREAMBLE_MSB 0x20
|
|
#define REG_PREAMBLE_LSB 0x21
|
|
#define REG_PAYLOAD_LENGTH 0x22
|
|
#define REG_MODEM_CONFIG_3 0x26
|
|
#define REG_FREQ_ERROR_MSB 0x28
|
|
#define REG_FREQ_ERROR_MID 0x29
|
|
#define REG_FREQ_ERROR_LSB 0x2a
|
|
#define REG_RSSI_WIDEBAND 0x2c
|
|
#define REG_DETECTION_OPTIMIZE 0x31
|
|
#define REG_HIGH_BW_OPTIMIZE_1 0x36
|
|
#define REG_DETECTION_THRESHOLD 0x37
|
|
#define REG_SYNC_WORD 0x39
|
|
#define REG_HIGH_BW_OPTIMIZE_2 0x3a
|
|
#define REG_DIO_MAPPING_1 0x40
|
|
#define REG_VERSION 0x42
|
|
#define REG_TCXO 0x4b
|
|
#define REG_PA_DAC 0x4d
|
|
|
|
// Modes
|
|
#define MODE_LONG_RANGE_MODE 0x80
|
|
#define MODE_SLEEP 0x00
|
|
#define MODE_STDBY 0x01
|
|
#define MODE_TX 0x03
|
|
#define MODE_RX_CONTINUOUS 0x05
|
|
#define MODE_RX_SINGLE 0x06
|
|
|
|
// PA config
|
|
#define PA_BOOST 0x80
|
|
|
|
// IRQ masks
|
|
#define IRQ_TX_DONE_MASK 0x08
|
|
#define IRQ_PAYLOAD_CRC_ERROR_MASK 0x20
|
|
#define IRQ_RX_DONE_MASK 0x40
|
|
|
|
#define MAX_PKT_LENGTH 255
|
|
|
|
bool lora_preinit_done = false;
|
|
|
|
LoRaClass::LoRaClass() :
|
|
_spiSettings(8E6, MSBFIRST, SPI_MODE0),
|
|
_ss(LORA_DEFAULT_SS_PIN), _reset(LORA_DEFAULT_RESET_PIN), _dio0(LORA_DEFAULT_DIO0_PIN),
|
|
_frequency(0),
|
|
_packetIndex(0),
|
|
_implicitHeaderMode(0),
|
|
_onReceive(NULL)
|
|
{
|
|
// overide Stream timeout value
|
|
setTimeout(0);
|
|
}
|
|
|
|
bool LoRaClass::preInit() {
|
|
// setup pins
|
|
pinMode(_ss, OUTPUT);
|
|
// set SS high
|
|
digitalWrite(_ss, HIGH);
|
|
|
|
SPI.begin();
|
|
|
|
// check version
|
|
uint8_t version = readRegister(REG_VERSION);
|
|
if (version != 0x12) {
|
|
return false;
|
|
}
|
|
|
|
lora_preinit_done = true;
|
|
return true;
|
|
}
|
|
|
|
int LoRaClass::begin(long frequency)
|
|
{
|
|
if (_reset != -1) {
|
|
pinMode(_reset, OUTPUT);
|
|
|
|
// perform reset
|
|
digitalWrite(_reset, LOW);
|
|
delay(10);
|
|
digitalWrite(_reset, HIGH);
|
|
delay(10);
|
|
}
|
|
|
|
if (!lora_preinit_done) {
|
|
if (!preInit()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// put in sleep mode
|
|
sleep();
|
|
|
|
// set frequency
|
|
setFrequency(frequency);
|
|
|
|
// set base addresses
|
|
writeRegister(REG_FIFO_TX_BASE_ADDR, 0);
|
|
writeRegister(REG_FIFO_RX_BASE_ADDR, 0);
|
|
|
|
// set LNA boost
|
|
writeRegister(REG_LNA, readRegister(REG_LNA) | 0x03);
|
|
|
|
// set auto AGC
|
|
writeRegister(REG_MODEM_CONFIG_3, 0x04);
|
|
|
|
// set output power to 2 dBm
|
|
setTxPower(2);
|
|
|
|
// put in standby mode
|
|
idle();
|
|
|
|
return 1;
|
|
}
|
|
|
|
void LoRaClass::end()
|
|
{
|
|
// put in sleep mode
|
|
sleep();
|
|
|
|
// stop SPI
|
|
SPI.end();
|
|
|
|
lora_preinit_done = false;
|
|
}
|
|
|
|
int LoRaClass::beginPacket(int implicitHeader)
|
|
{
|
|
// put in standby mode
|
|
idle();
|
|
|
|
if (implicitHeader) {
|
|
implicitHeaderMode();
|
|
} else {
|
|
explicitHeaderMode();
|
|
}
|
|
|
|
// reset FIFO address and paload length
|
|
writeRegister(REG_FIFO_ADDR_PTR, 0);
|
|
writeRegister(REG_PAYLOAD_LENGTH, 0);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int LoRaClass::endPacket()
|
|
{
|
|
// put in TX mode
|
|
writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_TX);
|
|
|
|
// wait for TX done
|
|
while ((readRegister(REG_IRQ_FLAGS) & IRQ_TX_DONE_MASK) == 0) {
|
|
yield();
|
|
}
|
|
|
|
// clear IRQ's
|
|
writeRegister(REG_IRQ_FLAGS, IRQ_TX_DONE_MASK);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int LoRaClass::parsePacket(int size)
|
|
{
|
|
int packetLength = 0;
|
|
int irqFlags = readRegister(REG_IRQ_FLAGS);
|
|
|
|
if (size > 0) {
|
|
implicitHeaderMode();
|
|
|
|
writeRegister(REG_PAYLOAD_LENGTH, size & 0xff);
|
|
} else {
|
|
explicitHeaderMode();
|
|
}
|
|
|
|
// clear IRQ's
|
|
writeRegister(REG_IRQ_FLAGS, irqFlags);
|
|
|
|
if ((irqFlags & IRQ_RX_DONE_MASK) && (irqFlags & IRQ_PAYLOAD_CRC_ERROR_MASK) == 0) {
|
|
// received a packet
|
|
_packetIndex = 0;
|
|
|
|
// read packet length
|
|
if (_implicitHeaderMode) {
|
|
packetLength = readRegister(REG_PAYLOAD_LENGTH);
|
|
} else {
|
|
packetLength = readRegister(REG_RX_NB_BYTES);
|
|
}
|
|
|
|
// set FIFO address to current RX address
|
|
writeRegister(REG_FIFO_ADDR_PTR, readRegister(REG_FIFO_RX_CURRENT_ADDR));
|
|
|
|
// put in standby mode
|
|
idle();
|
|
} else if (readRegister(REG_OP_MODE) != (MODE_LONG_RANGE_MODE | MODE_RX_SINGLE)) {
|
|
// not currently in RX mode
|
|
|
|
// reset FIFO address
|
|
writeRegister(REG_FIFO_ADDR_PTR, 0);
|
|
|
|
// put in single RX mode
|
|
writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_SINGLE);
|
|
}
|
|
|
|
return packetLength;
|
|
}
|
|
|
|
uint8_t LoRaClass::modemStatus() {
|
|
return readRegister(REG_MODEM_STAT);
|
|
}
|
|
|
|
|
|
uint8_t LoRaClass::currentRssiRaw() {
|
|
uint8_t rssi = readRegister(REG_RSSI_VALUE);
|
|
return rssi;
|
|
}
|
|
|
|
int ISR_VECT LoRaClass::currentRssi() {
|
|
int rssi = (int)readRegister(REG_RSSI_VALUE) - RSSI_OFFSET;
|
|
if (_frequency < 820E6) rssi -= 7;
|
|
return rssi;
|
|
}
|
|
|
|
uint8_t LoRaClass::packetRssiRaw() {
|
|
uint8_t pkt_rssi_value = readRegister(REG_PKT_RSSI_VALUE);
|
|
return pkt_rssi_value;
|
|
}
|
|
|
|
int ISR_VECT LoRaClass::packetRssi() {
|
|
int pkt_rssi = (int)readRegister(REG_PKT_RSSI_VALUE) - RSSI_OFFSET;
|
|
int pkt_snr = packetSnr();
|
|
|
|
if (_frequency < 820E6) pkt_rssi -= 7;
|
|
|
|
if (pkt_snr < 0) {
|
|
pkt_rssi += pkt_snr;
|
|
} else {
|
|
// Slope correction is (16/15)*pkt_rssi,
|
|
// this estimation looses one floating point
|
|
// operation, and should be precise enough.
|
|
pkt_rssi = (int)(1.066 * pkt_rssi);
|
|
}
|
|
|
|
return pkt_rssi;
|
|
}
|
|
|
|
uint8_t ISR_VECT LoRaClass::packetSnrRaw() {
|
|
return readRegister(REG_PKT_SNR_VALUE);
|
|
}
|
|
|
|
float ISR_VECT LoRaClass::packetSnr() {
|
|
return ((int8_t)readRegister(REG_PKT_SNR_VALUE)) * 0.25;
|
|
}
|
|
|
|
long LoRaClass::packetFrequencyError()
|
|
{
|
|
int32_t freqError = 0;
|
|
freqError = static_cast<int32_t>(readRegister(REG_FREQ_ERROR_MSB) & B111);
|
|
freqError <<= 8L;
|
|
freqError += static_cast<int32_t>(readRegister(REG_FREQ_ERROR_MID));
|
|
freqError <<= 8L;
|
|
freqError += static_cast<int32_t>(readRegister(REG_FREQ_ERROR_LSB));
|
|
|
|
if (readRegister(REG_FREQ_ERROR_MSB) & B1000) { // Sign bit is on
|
|
freqError -= 524288; // B1000'0000'0000'0000'0000
|
|
}
|
|
|
|
const float fXtal = 32E6; // FXOSC: crystal oscillator (XTAL) frequency (2.5. Chip Specification, p. 14)
|
|
const float fError = ((static_cast<float>(freqError) * (1L << 24)) / fXtal) * (getSignalBandwidth() / 500000.0f); // p. 37
|
|
|
|
return static_cast<long>(fError);
|
|
}
|
|
|
|
size_t LoRaClass::write(uint8_t byte)
|
|
{
|
|
return write(&byte, sizeof(byte));
|
|
}
|
|
|
|
size_t LoRaClass::write(const uint8_t *buffer, size_t size)
|
|
{
|
|
int currentLength = readRegister(REG_PAYLOAD_LENGTH);
|
|
|
|
// check size
|
|
if ((currentLength + size) > MAX_PKT_LENGTH) {
|
|
size = MAX_PKT_LENGTH - currentLength;
|
|
}
|
|
|
|
// write data
|
|
for (size_t i = 0; i < size; i++) {
|
|
writeRegister(REG_FIFO, buffer[i]);
|
|
}
|
|
|
|
// update length
|
|
writeRegister(REG_PAYLOAD_LENGTH, currentLength + size);
|
|
|
|
return size;
|
|
}
|
|
|
|
int ISR_VECT LoRaClass::available()
|
|
{
|
|
return (readRegister(REG_RX_NB_BYTES) - _packetIndex);
|
|
}
|
|
|
|
int ISR_VECT LoRaClass::read()
|
|
{
|
|
if (!available()) {
|
|
return -1;
|
|
}
|
|
|
|
_packetIndex++;
|
|
|
|
return readRegister(REG_FIFO);
|
|
}
|
|
|
|
int LoRaClass::peek()
|
|
{
|
|
if (!available()) {
|
|
return -1;
|
|
}
|
|
|
|
// store current FIFO address
|
|
int currentAddress = readRegister(REG_FIFO_ADDR_PTR);
|
|
|
|
// read
|
|
uint8_t b = readRegister(REG_FIFO);
|
|
|
|
// restore FIFO address
|
|
writeRegister(REG_FIFO_ADDR_PTR, currentAddress);
|
|
|
|
return b;
|
|
}
|
|
|
|
void LoRaClass::flush()
|
|
{
|
|
}
|
|
|
|
void LoRaClass::onReceive(void(*callback)(int))
|
|
{
|
|
_onReceive = callback;
|
|
|
|
if (callback) {
|
|
pinMode(_dio0, INPUT);
|
|
|
|
writeRegister(REG_DIO_MAPPING_1, 0x00);
|
|
#ifdef SPI_HAS_NOTUSINGINTERRUPT
|
|
SPI.usingInterrupt(digitalPinToInterrupt(_dio0));
|
|
#endif
|
|
attachInterrupt(digitalPinToInterrupt(_dio0), LoRaClass::onDio0Rise, RISING);
|
|
} else {
|
|
detachInterrupt(digitalPinToInterrupt(_dio0));
|
|
#ifdef SPI_HAS_NOTUSINGINTERRUPT
|
|
SPI.notUsingInterrupt(digitalPinToInterrupt(_dio0));
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void LoRaClass::receive(int size)
|
|
{
|
|
if (size > 0) {
|
|
implicitHeaderMode();
|
|
|
|
writeRegister(REG_PAYLOAD_LENGTH, size & 0xff);
|
|
} else {
|
|
explicitHeaderMode();
|
|
}
|
|
|
|
writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_CONTINUOUS);
|
|
}
|
|
|
|
void LoRaClass::idle()
|
|
{
|
|
writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_STDBY);
|
|
}
|
|
|
|
void LoRaClass::sleep()
|
|
{
|
|
writeRegister(REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_SLEEP);
|
|
}
|
|
|
|
void LoRaClass::enableTCXO() {
|
|
uint8_t tcxo_reg = readRegister(REG_TCXO);
|
|
writeRegister(REG_TCXO, tcxo_reg | 0x10);
|
|
}
|
|
|
|
void LoRaClass::disableTCXO() {
|
|
uint8_t tcxo_reg = readRegister(REG_TCXO);
|
|
writeRegister(REG_TCXO, tcxo_reg & 0xEF);
|
|
}
|
|
|
|
void LoRaClass::setTxPower(int level, int outputPin) {
|
|
if (PA_OUTPUT_RFO_PIN == outputPin) {
|
|
// RFO
|
|
if (level < 0) {
|
|
level = 0;
|
|
} else if (level > 14) {
|
|
level = 14;
|
|
}
|
|
|
|
writeRegister(REG_PA_DAC, 0x84);
|
|
writeRegister(REG_PA_CONFIG, 0x70 | level);
|
|
|
|
} else {
|
|
// PA BOOST
|
|
if (level < 2) {
|
|
level = 2;
|
|
} else if (level > 17) {
|
|
level = 17;
|
|
}
|
|
|
|
writeRegister(REG_PA_DAC, 0x84);
|
|
writeRegister(REG_PA_CONFIG, PA_BOOST | (level - 2));
|
|
}
|
|
}
|
|
|
|
uint8_t LoRaClass::getTxPower() {
|
|
byte txp = readRegister(REG_PA_CONFIG);
|
|
return txp;
|
|
}
|
|
|
|
void LoRaClass::setFrequency(long frequency) {
|
|
_frequency = frequency;
|
|
|
|
uint32_t frf = ((uint64_t)frequency << 19) / 32000000;
|
|
|
|
writeRegister(REG_FRF_MSB, (uint8_t)(frf >> 16));
|
|
writeRegister(REG_FRF_MID, (uint8_t)(frf >> 8));
|
|
writeRegister(REG_FRF_LSB, (uint8_t)(frf >> 0));
|
|
|
|
optimizeModemSensitivity();
|
|
}
|
|
|
|
uint32_t LoRaClass::getFrequency() {
|
|
uint8_t msb = readRegister(REG_FRF_MSB);
|
|
uint8_t mid = readRegister(REG_FRF_MID);
|
|
uint8_t lsb = readRegister(REG_FRF_LSB);
|
|
|
|
uint32_t frf = ((uint32_t)msb << 16) | ((uint32_t)mid << 8) | (uint32_t)lsb;
|
|
uint64_t frm = (uint64_t)frf*32000000;
|
|
uint32_t frequency = (frm >> 19);
|
|
|
|
return frequency;
|
|
}
|
|
|
|
void LoRaClass::setSpreadingFactor(int sf)
|
|
{
|
|
if (sf < 6) {
|
|
sf = 6;
|
|
} else if (sf > 12) {
|
|
sf = 12;
|
|
}
|
|
|
|
if (sf == 6) {
|
|
writeRegister(REG_DETECTION_OPTIMIZE, 0xc5);
|
|
writeRegister(REG_DETECTION_THRESHOLD, 0x0c);
|
|
} else {
|
|
writeRegister(REG_DETECTION_OPTIMIZE, 0xc3);
|
|
writeRegister(REG_DETECTION_THRESHOLD, 0x0a);
|
|
}
|
|
|
|
writeRegister(REG_MODEM_CONFIG_2, (readRegister(REG_MODEM_CONFIG_2) & 0x0f) | ((sf << 4) & 0xf0));
|
|
|
|
handleLowDataRate();
|
|
}
|
|
|
|
long LoRaClass::getSignalBandwidth()
|
|
{
|
|
byte bw = (readRegister(REG_MODEM_CONFIG_1) >> 4);
|
|
switch (bw) {
|
|
case 0: return 7.8E3;
|
|
case 1: return 10.4E3;
|
|
case 2: return 15.6E3;
|
|
case 3: return 20.8E3;
|
|
case 4: return 31.25E3;
|
|
case 5: return 41.7E3;
|
|
case 6: return 62.5E3;
|
|
case 7: return 125E3;
|
|
case 8: return 250E3;
|
|
case 9: return 500E3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void LoRaClass::handleLowDataRate(){
|
|
int sf = (readRegister(REG_MODEM_CONFIG_2) >> 4);
|
|
if ( long( (1<<sf) / (getSignalBandwidth()/1000)) > 16) {
|
|
// set auto AGC and LowDataRateOptimize
|
|
writeRegister(REG_MODEM_CONFIG_3, (1<<3)|(1<<2));
|
|
}
|
|
else {
|
|
// set auto AGC
|
|
writeRegister(REG_MODEM_CONFIG_3, (1<<2));
|
|
}
|
|
}
|
|
|
|
void LoRaClass::optimizeModemSensitivity(){
|
|
byte bw = (readRegister(REG_MODEM_CONFIG_1) >> 4);
|
|
uint32_t freq = getFrequency();
|
|
|
|
if (bw == 9 && 410E6 <= freq <= 525E6) {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1, 0x02);
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_2, 0x7f);
|
|
} else if (bw == 9 && 862E6 <= freq <= 1020E6) {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1, 0x02);
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_2, 0x64);
|
|
} else {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1, 0x03);
|
|
}
|
|
}
|
|
|
|
void LoRaClass::setSignalBandwidth(long sbw)
|
|
{
|
|
int bw;
|
|
|
|
if (sbw <= 7.8E3) {
|
|
bw = 0;
|
|
} else if (sbw <= 10.4E3) {
|
|
bw = 1;
|
|
} else if (sbw <= 15.6E3) {
|
|
bw = 2;
|
|
} else if (sbw <= 20.8E3) {
|
|
bw = 3;
|
|
} else if (sbw <= 31.25E3) {
|
|
bw = 4;
|
|
} else if (sbw <= 41.7E3) {
|
|
bw = 5;
|
|
} else if (sbw <= 62.5E3) {
|
|
bw = 6;
|
|
} else if (sbw <= 125E3) {
|
|
bw = 7;
|
|
} else if (sbw <= 250E3) {
|
|
bw = 8;
|
|
} else /*if (sbw <= 250E3)*/ {
|
|
bw = 9;
|
|
}
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1, (readRegister(REG_MODEM_CONFIG_1) & 0x0f) | (bw << 4));
|
|
|
|
handleLowDataRate();
|
|
optimizeModemSensitivity();
|
|
}
|
|
|
|
void LoRaClass::setCodingRate4(int denominator)
|
|
{
|
|
if (denominator < 5) {
|
|
denominator = 5;
|
|
} else if (denominator > 8) {
|
|
denominator = 8;
|
|
}
|
|
|
|
int cr = denominator - 4;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1, (readRegister(REG_MODEM_CONFIG_1) & 0xf1) | (cr << 1));
|
|
}
|
|
|
|
void LoRaClass::setPreambleLength(long length)
|
|
{
|
|
writeRegister(REG_PREAMBLE_MSB, (uint8_t)(length >> 8));
|
|
writeRegister(REG_PREAMBLE_LSB, (uint8_t)(length >> 0));
|
|
}
|
|
|
|
void LoRaClass::setSyncWord(int sw)
|
|
{
|
|
writeRegister(REG_SYNC_WORD, sw);
|
|
}
|
|
|
|
void LoRaClass::enableCrc()
|
|
{
|
|
writeRegister(REG_MODEM_CONFIG_2, readRegister(REG_MODEM_CONFIG_2) | 0x04);
|
|
}
|
|
|
|
void LoRaClass::disableCrc()
|
|
{
|
|
writeRegister(REG_MODEM_CONFIG_2, readRegister(REG_MODEM_CONFIG_2) & 0xfb);
|
|
}
|
|
|
|
byte LoRaClass::random()
|
|
{
|
|
return readRegister(REG_RSSI_WIDEBAND);
|
|
}
|
|
|
|
void LoRaClass::setPins(int ss, int reset, int dio0)
|
|
{
|
|
_ss = ss;
|
|
_reset = reset;
|
|
_dio0 = dio0;
|
|
}
|
|
|
|
void LoRaClass::setSPIFrequency(uint32_t frequency)
|
|
{
|
|
_spiSettings = SPISettings(frequency, MSBFIRST, SPI_MODE0);
|
|
}
|
|
|
|
void LoRaClass::dumpRegisters(Stream& out)
|
|
{
|
|
for (int i = 0; i < 128; i++) {
|
|
out.print("0x");
|
|
out.print(i, HEX);
|
|
out.print(": 0x");
|
|
out.println(readRegister(i), HEX);
|
|
}
|
|
}
|
|
|
|
void LoRaClass::explicitHeaderMode()
|
|
{
|
|
_implicitHeaderMode = 0;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1, readRegister(REG_MODEM_CONFIG_1) & 0xfe);
|
|
}
|
|
|
|
void LoRaClass::implicitHeaderMode()
|
|
{
|
|
_implicitHeaderMode = 1;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1, readRegister(REG_MODEM_CONFIG_1) | 0x01);
|
|
}
|
|
|
|
|
|
void ISR_VECT LoRaClass::handleDio0Rise()
|
|
{
|
|
int irqFlags = readRegister(REG_IRQ_FLAGS);
|
|
|
|
// clear IRQ's
|
|
writeRegister(REG_IRQ_FLAGS, irqFlags);
|
|
|
|
if ((irqFlags & IRQ_PAYLOAD_CRC_ERROR_MASK) == 0) {
|
|
// received a packet
|
|
_packetIndex = 0;
|
|
|
|
// read packet length
|
|
int packetLength = _implicitHeaderMode ? readRegister(REG_PAYLOAD_LENGTH) : readRegister(REG_RX_NB_BYTES);
|
|
|
|
// set FIFO address to current RX address
|
|
writeRegister(REG_FIFO_ADDR_PTR, readRegister(REG_FIFO_RX_CURRENT_ADDR));
|
|
|
|
if (_onReceive) {
|
|
_onReceive(packetLength);
|
|
}
|
|
|
|
// reset FIFO address
|
|
writeRegister(REG_FIFO_ADDR_PTR, 0);
|
|
}
|
|
}
|
|
|
|
uint8_t ISR_VECT LoRaClass::readRegister(uint8_t address)
|
|
{
|
|
return singleTransfer(address & 0x7f, 0x00);
|
|
}
|
|
|
|
void LoRaClass::writeRegister(uint8_t address, uint8_t value)
|
|
{
|
|
singleTransfer(address | 0x80, value);
|
|
}
|
|
|
|
uint8_t ISR_VECT LoRaClass::singleTransfer(uint8_t address, uint8_t value)
|
|
{
|
|
uint8_t response;
|
|
|
|
digitalWrite(_ss, LOW);
|
|
|
|
SPI.beginTransaction(_spiSettings);
|
|
SPI.transfer(address);
|
|
response = SPI.transfer(value);
|
|
SPI.endTransaction();
|
|
|
|
digitalWrite(_ss, HIGH);
|
|
|
|
return response;
|
|
}
|
|
|
|
void ISR_VECT LoRaClass::onDio0Rise()
|
|
{
|
|
LoRa.handleDio0Rise();
|
|
}
|
|
|
|
LoRaClass LoRa; |