mirror of
https://github.com/markqvist/RNode_Firmware.git
synced 2024-12-26 07:59:40 -05:00
677 lines
16 KiB
C++
677 lines
16 KiB
C++
// Copyright (c) Sandeep Mistry. All rights reserved.
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// Licensed under the MIT license.
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// Modifications and additions copyright 2023 by Mark Qvist
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// Obviously still under the MIT license.
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#include "Boards.h"
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#if MODEM == SX1276
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#include "sx127x.h"
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#if MCU_VARIANT == MCU_ESP32
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#if MCU_VARIANT == MCU_ESP32 and !defined(CONFIG_IDF_TARGET_ESP32S3)
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#include "soc/rtc_wdt.h"
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#endif
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#define ISR_VECT IRAM_ATTR
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#else
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#define ISR_VECT
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#endif
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// Registers
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#define REG_FIFO_7X 0x00
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#define REG_OP_MODE_7X 0x01
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#define REG_FRF_MSB_7X 0x06
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#define REG_FRF_MID_7X 0x07
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#define REG_FRF_LSB_7X 0x08
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#define REG_PA_CONFIG_7X 0x09
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#define REG_OCP_7X 0x0b
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#define REG_LNA_7X 0x0c
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#define REG_FIFO_ADDR_PTR_7X 0x0d
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#define REG_FIFO_TX_BASE_ADDR_7X 0x0e
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#define REG_FIFO_RX_BASE_ADDR_7X 0x0f
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#define REG_FIFO_RX_CURRENT_ADDR_7X 0x10
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#define REG_IRQ_FLAGS_7X 0x12
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#define REG_RX_NB_BYTES_7X 0x13
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#define REG_MODEM_STAT_7X 0x18
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#define REG_PKT_SNR_VALUE_7X 0x19
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#define REG_PKT_RSSI_VALUE_7X 0x1a
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#define REG_RSSI_VALUE_7X 0x1b
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#define REG_MODEM_CONFIG_1_7X 0x1d
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#define REG_MODEM_CONFIG_2_7X 0x1e
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#define REG_PREAMBLE_MSB_7X 0x20
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#define REG_PREAMBLE_LSB_7X 0x21
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#define REG_PAYLOAD_LENGTH_7X 0x22
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#define REG_MODEM_CONFIG_3_7X 0x26
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#define REG_FREQ_ERROR_MSB_7X 0x28
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#define REG_FREQ_ERROR_MID_7X 0x29
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#define REG_FREQ_ERROR_LSB_7X 0x2a
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#define REG_RSSI_WIDEBAND_7X 0x2c
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#define REG_DETECTION_OPTIMIZE_7X 0x31
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#define REG_HIGH_BW_OPTIMIZE_1_7X 0x36
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#define REG_DETECTION_THRESHOLD_7X 0x37
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#define REG_SYNC_WORD_7X 0x39
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#define REG_HIGH_BW_OPTIMIZE_2_7X 0x3a
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#define REG_DIO_MAPPING_1_7X 0x40
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#define REG_VERSION_7X 0x42
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#define REG_TCXO_7X 0x4b
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#define REG_PA_DAC_7X 0x4d
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// Modes
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#define MODE_LONG_RANGE_MODE_7X 0x80
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#define MODE_SLEEP_7X 0x00
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#define MODE_STDBY_7X 0x01
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#define MODE_TX_7X 0x03
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#define MODE_RX_CONTINUOUS_7X 0x05
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#define MODE_RX_SINGLE_7X 0x06
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// PA config
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#define PA_BOOST_7X 0x80
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// IRQ masks
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#define IRQ_TX_DONE_MASK_7X 0x08
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#define IRQ_PAYLOAD_CRC_ERROR_MASK_7X 0x20
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#define IRQ_RX_DONE_MASK_7X 0x40
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extern SPIClass SPI;
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#define MAX_PKT_LENGTH 255
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#define SYNC_WORD_7X 0x12
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sx127x::sx127x() :
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_spiSettings(8E6, MSBFIRST, SPI_MODE0),
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_ss(LORA_DEFAULT_SS_PIN), _reset(LORA_DEFAULT_RESET_PIN), _dio0(LORA_DEFAULT_DIO0_PIN),
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_frequency(0),
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_packetIndex(0),
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_preinit_done(false),
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_onReceive(NULL)
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{
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// overide Stream timeout value
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setTimeout(0);
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}
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bool sx127x::preInit() {
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// setup pins
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pinMode(_ss, OUTPUT);
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// set SS high
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digitalWrite(_ss, HIGH);
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SPI.begin();
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// check version (retry for up to 2 seconds)
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uint8_t version;
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long start = millis();
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while (((millis() - start) < 2000) && (millis() >= start)) {
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version = readRegister(REG_VERSION_7X);
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if (version == 0x12) {
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break;
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}
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delay(100);
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}
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if (version != 0x12) {
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return false;
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}
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_preinit_done = true;
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return true;
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}
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uint8_t ISR_VECT sx127x::readRegister(uint8_t address)
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{
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return singleTransfer(address & 0x7f, 0x00);
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}
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void sx127x::writeRegister(uint8_t address, uint8_t value)
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{
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singleTransfer(address | 0x80, value);
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}
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uint8_t ISR_VECT sx127x::singleTransfer(uint8_t address, uint8_t value)
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{
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uint8_t response;
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digitalWrite(_ss, LOW);
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SPI.beginTransaction(_spiSettings);
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SPI.transfer(address);
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response = SPI.transfer(value);
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SPI.endTransaction();
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digitalWrite(_ss, HIGH);
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return response;
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}
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int sx127x::begin(long frequency)
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{
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if (_reset != -1) {
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pinMode(_reset, OUTPUT);
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// perform reset
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digitalWrite(_reset, LOW);
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delay(10);
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digitalWrite(_reset, HIGH);
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delay(10);
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}
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if (_busy != -1) {
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pinMode(_busy, INPUT);
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}
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if (!_preinit_done) {
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if (!preInit()) {
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return false;
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}
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}
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// put in sleep mode
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sleep();
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// set frequency
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setFrequency(frequency);
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// set base addresses
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writeRegister(REG_FIFO_TX_BASE_ADDR_7X, 0);
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writeRegister(REG_FIFO_RX_BASE_ADDR_7X, 0);
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// set LNA boost
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writeRegister(REG_LNA_7X, readRegister(REG_LNA_7X) | 0x03);
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// set auto AGC
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writeRegister(REG_MODEM_CONFIG_3_7X, 0x04);
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setSyncWord(SYNC_WORD_7X);
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enableCrc();
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setTxPower(2);
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idle();
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return 1;
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}
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void sx127x::end()
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{
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// put in sleep mode
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sleep();
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// stop SPI
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SPI.end();
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_preinit_done = false;
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}
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int sx127x::beginPacket(int implicitHeader)
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{
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// put in standby mode
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idle();
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if (implicitHeader) {
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implicitHeaderMode();
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} else {
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explicitHeaderMode();
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}
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// reset FIFO address and payload length
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writeRegister(REG_FIFO_ADDR_PTR_7X, 0);
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writeRegister(REG_PAYLOAD_LENGTH_7X, 0);
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return 1;
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}
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int sx127x::endPacket()
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{
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// put in TX mode
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writeRegister(REG_OP_MODE_7X, MODE_LONG_RANGE_MODE_7X | MODE_TX_7X);
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// wait for TX done
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while ((readRegister(REG_IRQ_FLAGS_7X) & IRQ_TX_DONE_MASK_7X) == 0) {
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yield();
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}
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// clear IRQ's
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writeRegister(REG_IRQ_FLAGS_7X, IRQ_TX_DONE_MASK_7X);
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return 1;
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}
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uint8_t sx127x::modemStatus() {
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return readRegister(REG_MODEM_STAT_7X);
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}
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uint8_t sx127x::currentRssiRaw() {
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uint8_t rssi = readRegister(REG_RSSI_VALUE_7X);
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return rssi;
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}
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int ISR_VECT sx127x::currentRssi() {
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int rssi = (int)readRegister(REG_RSSI_VALUE_7X) - RSSI_OFFSET;
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if (_frequency < 820E6) rssi -= 7;
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return rssi;
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}
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uint8_t sx127x::packetRssiRaw() {
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uint8_t pkt_rssi_value = readRegister(REG_PKT_RSSI_VALUE_7X);
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return pkt_rssi_value;
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}
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int ISR_VECT sx127x::packetRssi() {
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int pkt_rssi = (int)readRegister(REG_PKT_RSSI_VALUE_7X) - RSSI_OFFSET;
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int pkt_snr = packetSnr();
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if (_frequency < 820E6) pkt_rssi -= 7;
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if (pkt_snr < 0) {
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pkt_rssi += pkt_snr;
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} else {
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// Slope correction is (16/15)*pkt_rssi,
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// this estimation looses one floating point
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// operation, and should be precise enough.
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pkt_rssi = (int)(1.066 * pkt_rssi);
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}
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return pkt_rssi;
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}
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uint8_t ISR_VECT sx127x::packetSnrRaw() {
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return readRegister(REG_PKT_SNR_VALUE_7X);
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}
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float ISR_VECT sx127x::packetSnr() {
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return ((int8_t)readRegister(REG_PKT_SNR_VALUE_7X)) * 0.25;
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}
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long sx127x::packetFrequencyError()
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{
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int32_t freqError = 0;
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freqError = static_cast<int32_t>(readRegister(REG_FREQ_ERROR_MSB_7X) & B111);
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freqError <<= 8L;
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freqError += static_cast<int32_t>(readRegister(REG_FREQ_ERROR_MID_7X));
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freqError <<= 8L;
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freqError += static_cast<int32_t>(readRegister(REG_FREQ_ERROR_LSB_7X));
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if (readRegister(REG_FREQ_ERROR_MSB_7X) & B1000) { // Sign bit is on
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freqError -= 524288; // B1000'0000'0000'0000'0000
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}
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const float fXtal = 32E6; // FXOSC: crystal oscillator (XTAL) frequency (2.5. Chip Specification, p. 14)
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const float fError = ((static_cast<float>(freqError) * (1L << 24)) / fXtal) * (getSignalBandwidth() / 500000.0f); // p. 37
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return static_cast<long>(fError);
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}
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size_t sx127x::write(uint8_t byte)
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{
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return write(&byte, sizeof(byte));
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}
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size_t sx127x::write(const uint8_t *buffer, size_t size)
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{
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int currentLength = readRegister(REG_PAYLOAD_LENGTH_7X);
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// check size
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if ((currentLength + size) > MAX_PKT_LENGTH) {
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size = MAX_PKT_LENGTH - currentLength;
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}
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// write data
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for (size_t i = 0; i < size; i++) {
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writeRegister(REG_FIFO_7X, buffer[i]);
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}
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// update length
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writeRegister(REG_PAYLOAD_LENGTH_7X, currentLength + size);
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return size;
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}
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int ISR_VECT sx127x::available()
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{
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return (readRegister(REG_RX_NB_BYTES_7X) - _packetIndex);
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}
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int ISR_VECT sx127x::read()
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{
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if (!available()) {
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return -1;
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}
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_packetIndex++;
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return readRegister(REG_FIFO_7X);
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}
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int sx127x::peek()
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{
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if (!available()) {
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return -1;
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}
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// store current FIFO address
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int currentAddress = readRegister(REG_FIFO_ADDR_PTR_7X);
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// read
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uint8_t b = readRegister(REG_FIFO_7X);
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// restore FIFO address
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writeRegister(REG_FIFO_ADDR_PTR_7X, currentAddress);
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return b;
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}
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void sx127x::flush()
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{
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}
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void sx127x::onReceive(void(*callback)(int))
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{
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_onReceive = callback;
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if (callback) {
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pinMode(_dio0, INPUT);
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writeRegister(REG_DIO_MAPPING_1_7X, 0x00);
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#ifdef SPI_HAS_NOTUSINGINTERRUPT
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SPI.usingInterrupt(digitalPinToInterrupt(_dio0));
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#endif
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attachInterrupt(digitalPinToInterrupt(_dio0), sx127x::onDio0Rise, RISING);
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} else {
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detachInterrupt(digitalPinToInterrupt(_dio0));
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#ifdef SPI_HAS_NOTUSINGINTERRUPT
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SPI.notUsingInterrupt(digitalPinToInterrupt(_dio0));
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#endif
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}
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}
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void sx127x::receive(int size)
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{
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if (size > 0) {
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implicitHeaderMode();
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writeRegister(REG_PAYLOAD_LENGTH_7X, size & 0xff);
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} else {
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explicitHeaderMode();
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}
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writeRegister(REG_OP_MODE_7X, MODE_LONG_RANGE_MODE_7X | MODE_RX_CONTINUOUS_7X);
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}
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void sx127x::idle()
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{
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writeRegister(REG_OP_MODE_7X, MODE_LONG_RANGE_MODE_7X | MODE_STDBY_7X);
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}
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void sx127x::sleep()
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{
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writeRegister(REG_OP_MODE_7X, MODE_LONG_RANGE_MODE_7X | MODE_SLEEP_7X);
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}
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void sx127x::enableTCXO() {
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uint8_t tcxo_reg = readRegister(REG_TCXO_7X);
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writeRegister(REG_TCXO_7X, tcxo_reg | 0x10);
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}
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void sx127x::disableTCXO() {
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uint8_t tcxo_reg = readRegister(REG_TCXO_7X);
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writeRegister(REG_TCXO_7X, tcxo_reg & 0xEF);
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}
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void sx127x::setTxPower(int level, int outputPin) {
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if (PA_OUTPUT_RFO_PIN == outputPin) {
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// RFO
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if (level < 0) {
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level = 0;
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} else if (level > 14) {
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level = 14;
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}
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writeRegister(REG_PA_DAC_7X, 0x84);
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writeRegister(REG_PA_CONFIG_7X, 0x70 | level);
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} else {
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// PA BOOST
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if (level < 2) {
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level = 2;
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} else if (level > 17) {
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level = 17;
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}
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writeRegister(REG_PA_DAC_7X, 0x84);
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writeRegister(REG_PA_CONFIG_7X, PA_BOOST_7X | (level - 2));
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}
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}
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uint8_t sx127x::getTxPower() {
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byte txp = readRegister(REG_PA_CONFIG_7X);
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return txp;
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}
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void sx127x::setFrequency(unsigned long frequency) {
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_frequency = frequency;
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uint32_t frf = ((uint64_t)frequency << 19) / 32000000;
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writeRegister(REG_FRF_MSB_7X, (uint8_t)(frf >> 16));
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writeRegister(REG_FRF_MID_7X, (uint8_t)(frf >> 8));
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writeRegister(REG_FRF_LSB_7X, (uint8_t)(frf >> 0));
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optimizeModemSensitivity();
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}
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uint32_t sx127x::getFrequency() {
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uint8_t msb = readRegister(REG_FRF_MSB_7X);
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uint8_t mid = readRegister(REG_FRF_MID_7X);
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uint8_t lsb = readRegister(REG_FRF_LSB_7X);
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uint32_t frf = ((uint32_t)msb << 16) | ((uint32_t)mid << 8) | (uint32_t)lsb;
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uint64_t frm = (uint64_t)frf*32000000;
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uint32_t frequency = (frm >> 19);
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return frequency;
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}
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void sx127x::setSpreadingFactor(int sf)
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{
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if (sf < 6) {
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sf = 6;
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} else if (sf > 12) {
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sf = 12;
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}
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if (sf == 6) {
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writeRegister(REG_DETECTION_OPTIMIZE_7X, 0xc5);
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writeRegister(REG_DETECTION_THRESHOLD_7X, 0x0c);
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} else {
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writeRegister(REG_DETECTION_OPTIMIZE_7X, 0xc3);
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writeRegister(REG_DETECTION_THRESHOLD_7X, 0x0a);
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}
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writeRegister(REG_MODEM_CONFIG_2_7X, (readRegister(REG_MODEM_CONFIG_2_7X) & 0x0f) | ((sf << 4) & 0xf0));
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handleLowDataRate();
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}
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long sx127x::getSignalBandwidth()
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{
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byte bw = (readRegister(REG_MODEM_CONFIG_1_7X) >> 4);
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switch (bw) {
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case 0: return 7.8E3;
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case 1: return 10.4E3;
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case 2: return 15.6E3;
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case 3: return 20.8E3;
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case 4: return 31.25E3;
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case 5: return 41.7E3;
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case 6: return 62.5E3;
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case 7: return 125E3;
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case 8: return 250E3;
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case 9: return 500E3;
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}
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return 0;
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}
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void sx127x::handleLowDataRate(){
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int sf = (readRegister(REG_MODEM_CONFIG_2_7X) >> 4);
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if ( long( (1<<sf) / (getSignalBandwidth()/1000)) > 16) {
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// set auto AGC and LowDataRateOptimize
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writeRegister(REG_MODEM_CONFIG_3_7X, (1<<3)|(1<<2));
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} else {
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// set auto AGC
|
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writeRegister(REG_MODEM_CONFIG_3_7X, (1<<2));
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}
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|
}
|
|
|
|
void sx127x::optimizeModemSensitivity(){
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|
byte bw = (readRegister(REG_MODEM_CONFIG_1_7X) >> 4);
|
|
uint32_t freq = getFrequency();
|
|
|
|
if (bw == 9 && (410E6 <= freq) && (freq <= 525E6)) {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1_7X, 0x02);
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|
writeRegister(REG_HIGH_BW_OPTIMIZE_2_7X, 0x7f);
|
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} else if (bw == 9 && (820E6 <= freq) && (freq <= 1020E6)) {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1_7X, 0x02);
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_2_7X, 0x64);
|
|
} else {
|
|
writeRegister(REG_HIGH_BW_OPTIMIZE_1_7X, 0x03);
|
|
}
|
|
}
|
|
|
|
void sx127x::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_7X, (readRegister(REG_MODEM_CONFIG_1_7X) & 0x0f) | (bw << 4));
|
|
|
|
|
|
handleLowDataRate();
|
|
optimizeModemSensitivity();
|
|
}
|
|
|
|
void sx127x::setCodingRate4(int denominator)
|
|
{
|
|
if (denominator < 5) {
|
|
denominator = 5;
|
|
} else if (denominator > 8) {
|
|
denominator = 8;
|
|
}
|
|
|
|
int cr = denominator - 4;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1_7X, (readRegister(REG_MODEM_CONFIG_1_7X) & 0xf1) | (cr << 1));
|
|
}
|
|
|
|
void sx127x::setPreambleLength(long length)
|
|
{
|
|
writeRegister(REG_PREAMBLE_MSB_7X, (uint8_t)(length >> 8));
|
|
writeRegister(REG_PREAMBLE_LSB_7X, (uint8_t)(length >> 0));
|
|
}
|
|
|
|
void sx127x::setSyncWord(uint8_t sw)
|
|
{
|
|
writeRegister(REG_SYNC_WORD_7X, sw);
|
|
}
|
|
|
|
void sx127x::enableCrc()
|
|
{
|
|
writeRegister(REG_MODEM_CONFIG_2_7X, readRegister(REG_MODEM_CONFIG_2_7X) | 0x04);
|
|
}
|
|
|
|
void sx127x::disableCrc()
|
|
{
|
|
writeRegister(REG_MODEM_CONFIG_2_7X, readRegister(REG_MODEM_CONFIG_2_7X) & 0xfb);
|
|
}
|
|
|
|
byte sx127x::random()
|
|
{
|
|
return readRegister(REG_RSSI_WIDEBAND_7X);
|
|
}
|
|
|
|
void sx127x::setPins(int ss, int reset, int dio0, int busy)
|
|
{
|
|
_ss = ss;
|
|
_reset = reset;
|
|
_dio0 = dio0;
|
|
_busy = busy;
|
|
}
|
|
|
|
void sx127x::setSPIFrequency(uint32_t frequency)
|
|
{
|
|
_spiSettings = SPISettings(frequency, MSBFIRST, SPI_MODE0);
|
|
}
|
|
|
|
void sx127x::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 sx127x::explicitHeaderMode()
|
|
{
|
|
_implicitHeaderMode = 0;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1_7X, readRegister(REG_MODEM_CONFIG_1_7X) & 0xfe);
|
|
}
|
|
|
|
void sx127x::implicitHeaderMode()
|
|
{
|
|
_implicitHeaderMode = 1;
|
|
|
|
writeRegister(REG_MODEM_CONFIG_1_7X, readRegister(REG_MODEM_CONFIG_1_7X) | 0x01);
|
|
}
|
|
|
|
|
|
void ISR_VECT sx127x::handleDio0Rise()
|
|
{
|
|
int irqFlags = readRegister(REG_IRQ_FLAGS_7X);
|
|
|
|
// clear IRQ's
|
|
writeRegister(REG_IRQ_FLAGS_7X, irqFlags);
|
|
if ((irqFlags & IRQ_PAYLOAD_CRC_ERROR_MASK_7X) == 0) {
|
|
|
|
// received a packet
|
|
_packetIndex = 0;
|
|
|
|
// read packet length
|
|
int packetLength = _implicitHeaderMode ? readRegister(REG_PAYLOAD_LENGTH_7X) : readRegister(REG_RX_NB_BYTES_7X);
|
|
|
|
// set FIFO address to current RX address
|
|
writeRegister(REG_FIFO_ADDR_PTR_7X, readRegister(REG_FIFO_RX_CURRENT_ADDR_7X));
|
|
|
|
if (_onReceive) {
|
|
_onReceive(packetLength);
|
|
}
|
|
|
|
// reset FIFO address
|
|
writeRegister(REG_FIFO_ADDR_PTR_7X, 0);
|
|
}
|
|
}
|
|
|
|
void ISR_VECT sx127x::onDio0Rise()
|
|
{
|
|
sx127x_modem.handleDio0Rise();
|
|
}
|
|
|
|
sx127x sx127x_modem;
|
|
|
|
#endif |