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RNode_Firmware_CE/Radio.hpp

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// Copyright (c) Sandeep Mistry. All rights reserved.
// Licensed under the MIT license.
// Modifications and additions copyright 2023 by Mark Qvist & Jacob Eva
// Obviously still under the MIT license.
#ifndef RADIO_H
#define RADIO_H
#include <Arduino.h>
#include <SPI.h>
#include "Interfaces.h"
#include "Boards.h"
#include "src/misc/FIFOBuffer.h"
#define MAX_PKT_LENGTH 255
// TX
#define PA_OUTPUT_RFO_PIN 0
#define PA_OUTPUT_PA_BOOST_PIN 1
// DCD
#define STATUS_INTERVAL_MS 3
#define DCD_SAMPLES 2500
#define UTIL_UPDATE_INTERVAL_MS 1000
#define UTIL_UPDATE_INTERVAL (UTIL_UPDATE_INTERVAL_MS/STATUS_INTERVAL_MS)
#define AIRTIME_LONGTERM 3600
#define AIRTIME_LONGTERM_MS (AIRTIME_LONGTERM*1000)
#define AIRTIME_BINLEN_MS (STATUS_INTERVAL_MS*DCD_SAMPLES)
#define AIRTIME_BINS ((AIRTIME_LONGTERM*1000)/AIRTIME_BINLEN_MS)
#define current_airtime_bin(void) (millis()%AIRTIME_LONGTERM_MS)/AIRTIME_BINLEN_MS
#define DCD_THRESHOLD 2
#define DCD_LED_STEP_D 3
#define LORA_PREAMBLE_SYMBOLS_HW 4
#define LORA_PREAMBLE_SYMBOLS_MIN 18
#define LORA_PREAMBLE_TARGET_MS 15
#define LORA_PREAMBLE_FAST_TARGET_MS 1
#define LORA_FAST_BITRATE_THRESHOLD 40000
#define RSSI_OFFSET 157
#define PHY_HEADER_LORA_SYMBOLS 8
#define _e 2.71828183
#define _S 10.0
// Status flags
const uint8_t SIG_DETECT = 0x01;
const uint8_t SIG_SYNCED = 0x02;
const uint8_t RX_ONGOING = 0x04;
// forward declare Utilities.h LED functions
void led_rx_on();
void led_rx_off();
void led_indicate_airtime_lock();
#if PLATFORM == PLATFORM_ESP32
// get update_lock for ESP32
extern portMUX_TYPE update_lock;
#endif
class RadioInterface : public Stream {
public:
// todo: in the future define _spiModem and _spiSettings from here for inheritence by child classes
RadioInterface(uint8_t index) : _index(index), _radio_locked(false),
_radio_online(false), _st_airtime_limit(0.0), _lt_airtime_limit(0.0),
_airtime_lock(false), _airtime(0.0), _longterm_airtime(0.0),
_local_channel_util(0.0), _total_channel_util(0.0),
_longterm_channel_util(0.0), _last_status_update(0),
_stat_signal_detected(false), _stat_signal_synced(false),_stat_rx_ongoing(false), _last_dcd(0),
_dcd_count(0), _dcd(false), _dcd_led(false),
_dcd_waiting(false), _dcd_wait_until(0), _dcd_sample(0),
_post_tx_yield_timeout(0), _csma_slot_ms(50), _csma_p_min(0.1),
_csma_p_max(0.8), _preambleLength(6), _lora_symbol_time_ms(0.0),
_lora_symbol_rate(0.0), _lora_us_per_byte(0.0), _bitrate(0),
_packet{0}, _onReceive(NULL) {};
virtual int begin() = 0;
virtual void end() = 0;
virtual int beginPacket(int implicitHeader = false) = 0;
virtual int endPacket() = 0;
virtual int packetRssi() = 0;
virtual int currentRssi() = 0;
virtual uint8_t packetRssiRaw() = 0;
virtual uint8_t currentRssiRaw() = 0;
virtual uint8_t packetSnrRaw() = 0;
virtual float packetSnr() = 0;
virtual long packetFrequencyError() = 0;
// from Print
virtual size_t write(uint8_t byte) = 0;
virtual size_t write(const uint8_t *buffer, size_t size) = 0;
// from Stream
virtual int available() = 0;
virtual int read() = 0;
virtual int peek() = 0;
virtual void flush() = 0;
virtual void onReceive(void(*callback)(uint8_t, int)) = 0;
virtual void receive(int size = 0) = 0;
virtual void standby() = 0;
virtual void sleep() = 0;
virtual bool preInit() = 0;
virtual uint8_t getTxPower() = 0;
virtual void setTxPower(int level, int outputPin = PA_OUTPUT_PA_BOOST_PIN) = 0;
virtual uint32_t getFrequency() = 0;
virtual void setFrequency(uint32_t frequency) = 0;
virtual void setSpreadingFactor(int sf) = 0;
virtual uint8_t getSpreadingFactor() = 0;
virtual uint32_t getSignalBandwidth() = 0;
virtual void setSignalBandwidth(uint32_t sbw) = 0;
virtual void setCodingRate4(int denominator) = 0;
virtual uint8_t getCodingRate4() = 0;
virtual void setPreambleLength(long length) = 0;
virtual uint8_t modemStatus() = 0;
virtual void enableCrc() = 0;
virtual void disableCrc() = 0;
virtual void enableTCXO() = 0;
virtual void disableTCXO() = 0;
virtual byte random() = 0;
virtual void setSPIFrequency(uint32_t frequency) = 0;
virtual void updateBitrate() = 0;
virtual void handleDio0Rise() = 0;
virtual bool getPacketValidity() = 0;
uint32_t getBitrate() { return _bitrate; };
uint8_t getIndex() { return _index; };
void setRadioLock(bool lock) { _radio_locked = lock; };
bool getRadioLock() { return _radio_locked; };
void setRadioOnline(bool online) { _radio_online = online; };
bool getRadioOnline() { return _radio_online; };
void setSTALock(float at) { _st_airtime_limit = at; };
float getSTALock() { return _st_airtime_limit; };
void setLTALock(float at) { _lt_airtime_limit = at; };
float getLTALock() { return _lt_airtime_limit; };
bool calculateALock() {
_airtime_lock = false;
if (_st_airtime_limit != 0.0 && _airtime >= _st_airtime_limit) {
_airtime_lock = true;
}
if (_lt_airtime_limit != 0.0 && _longterm_airtime >= _lt_airtime_limit) {
_airtime_lock = true;
}
return _airtime_lock;
};
void updateAirtime() {
uint16_t cb = current_airtime_bin();
uint16_t pb = cb-1; if (cb-1 < 0) { pb = AIRTIME_BINS-1; }
uint16_t nb = cb+1; if (nb == AIRTIME_BINS) { nb = 0; }
_airtime_bins[nb] = 0;
_airtime = (float)(_airtime_bins[cb]+_airtime_bins[pb])/(2.0*AIRTIME_BINLEN_MS);
uint32_t longterm_airtime_sum = 0;
for (uint16_t bin = 0; bin < AIRTIME_BINS; bin++) {
longterm_airtime_sum += _airtime_bins[bin];
}
_longterm_airtime = (float)longterm_airtime_sum/(float)AIRTIME_LONGTERM_MS;
float longterm_channel_util_sum = 0.0;
for (uint16_t bin = 0; bin < AIRTIME_BINS; bin++) {
longterm_channel_util_sum += _longterm_bins[bin];
}
_longterm_channel_util = (float)longterm_channel_util_sum/(float)AIRTIME_BINS;
updateCSMAp();
//kiss_indicate_channel_stats(); // todo: enable me!
};
void addAirtime(uint16_t written) {
float packet_cost_ms = 0.0;
float payload_cost_ms = ((float)written * _lora_us_per_byte)/1000.0;
packet_cost_ms += payload_cost_ms;
packet_cost_ms += (_preambleLength+4.25)*_lora_symbol_time_ms;
packet_cost_ms += PHY_HEADER_LORA_SYMBOLS * _lora_symbol_time_ms;
uint16_t cb = current_airtime_bin();
uint16_t nb = cb+1; if (nb == AIRTIME_BINS) { nb = 0; }
_airtime_bins[cb] += packet_cost_ms;
_airtime_bins[nb] = 0;
};
void checkModemStatus() {
if (millis()-_last_status_update >= STATUS_INTERVAL_MS) {
updateModemStatus();
_util_samples[_dcd_sample] = _dcd;
_dcd_sample = (_dcd_sample+1)%DCD_SAMPLES;
if (_dcd_sample % UTIL_UPDATE_INTERVAL == 0) {
int util_count = 0;
for (int ui = 0; ui < DCD_SAMPLES; ui++) {
if (_util_samples[ui]) util_count++;
}
_local_channel_util = (float)util_count / (float)DCD_SAMPLES;
_total_channel_util = _local_channel_util + _airtime;
if (_total_channel_util > 1.0) _total_channel_util = 1.0;
int16_t cb = current_airtime_bin();
uint16_t nb = cb+1; if (nb == AIRTIME_BINS) { nb = 0; }
if (_total_channel_util > _longterm_bins[cb]) _longterm_bins[cb] = _total_channel_util;
_longterm_bins[nb] = 0.0;
updateAirtime();
}
}
};
void updateModemStatus() {
#if PLATFORM == PLATFORM_ESP32
portENTER_CRITICAL(&update_lock);
#elif PLATFORM == PLATFORM_NRF52
portENTER_CRITICAL();
#endif
uint8_t status = modemStatus();
_last_status_update = millis();
#if PLATFORM == PLATFORM_ESP32
portEXIT_CRITICAL(&update_lock);
#elif PLATFORM == PLATFORM_NRF52
portEXIT_CRITICAL();
#endif
if ((status & SIG_DETECT) == SIG_DETECT) { _stat_signal_detected = true; } else { _stat_signal_detected = false; }
if ((status & SIG_SYNCED) == SIG_SYNCED) { _stat_signal_synced = true; } else { _stat_signal_synced = false; }
if ((status & RX_ONGOING) == RX_ONGOING) { _stat_rx_ongoing = true; } else { _stat_rx_ongoing = false; }
// if (stat_signal_detected || stat_signal_synced || stat_rx_ongoing) {
if (_stat_signal_detected || _stat_signal_synced) {
if (_stat_rx_ongoing) {
if (_dcd_count < DCD_THRESHOLD) {
_dcd_count++;
} else {
_last_dcd = _last_status_update;
_dcd_led = true;
_dcd = true;
}
}
} else {
if (_dcd_count == 0) {
_dcd_led = false;
} else if (_dcd_count > DCD_LED_STEP_D) {
_dcd_count -= DCD_LED_STEP_D;
} else {
_dcd_count = 0;
}
if (_last_status_update > _last_dcd+_csma_slot_ms) {
_dcd = false;
_dcd_led = false;
_dcd_count = 0;
}
}
if (_dcd_led) {
led_rx_on();
} else {
if (_airtime_lock) {
led_indicate_airtime_lock();
} else {
led_rx_off();
}
}
};
void setPostTxYieldTimeout(uint32_t timeout) { _post_tx_yield_timeout = timeout; };
uint32_t getPostTxYieldTimeout() { return _post_tx_yield_timeout; };
void setDCD(bool dcd) { _dcd = dcd; };
bool getDCD() { return _dcd; };
void setDCDWaiting(bool dcd_waiting) { _dcd_waiting = dcd_waiting; };
bool getDCDWaiting() { return _dcd_waiting; };
void setDCDWaitUntil(uint32_t dcd_wait_until) { _dcd_wait_until = dcd_wait_until; };
bool getDCDWaitUntil() { return _dcd_wait_until; };
float getAirtime() { return _airtime; };
float getLongtermAirtime() { return _longterm_airtime; };
float getTotalChannelUtil() { return _total_channel_util; };
float getLongtermChannelUtil() { return _longterm_channel_util; };
float CSMASlope(float u) { return (pow(_e,_S*u-_S/2.0))/(pow(_e,_S*u-_S/2.0)+1.0); };
void updateCSMAp() {
_csma_p = (uint8_t)((1.0-(_csma_p_min+(_csma_p_max-_csma_p_min)*CSMASlope(_airtime)))*255.0);
};
uint8_t getCSMAp() { return _csma_p; };
void setCSMASlotMS(int slot_size) { _csma_slot_ms = slot_size; };
int getCSMASlotMS() { return _csma_slot_ms; };
float getSymbolTime() { return _lora_symbol_time_ms; };
float getSymbolRate() { return _lora_symbol_rate; };
long getPreambleLength() { return _preambleLength; };
protected:
virtual void explicitHeaderMode() = 0;
virtual void implicitHeaderMode() = 0;
uint8_t _index;
bool _radio_locked;
bool _radio_online;
float _st_airtime_limit;
float _lt_airtime_limit;
bool _airtime_lock;
uint16_t _airtime_bins[AIRTIME_BINS] = {0};
uint16_t _longterm_bins[AIRTIME_BINS] = {0};
float _airtime;
float _longterm_airtime;
float _local_channel_util;
float _total_channel_util;
float _longterm_channel_util;
uint32_t _last_status_update;
bool _stat_signal_detected;
bool _stat_signal_synced;
bool _stat_rx_ongoing;
uint32_t _last_dcd;
uint16_t _dcd_count;
bool _dcd;
bool _dcd_led;
bool _dcd_waiting;
long _dcd_wait_until;
bool _util_samples[DCD_SAMPLES] = {false};
int _dcd_sample;
uint32_t _post_tx_yield_timeout;
uint8_t _csma_p;
int _csma_slot_ms;
float _csma_p_min;
float _csma_p_max;
long _preambleLength;
float _lora_symbol_time_ms;
float _lora_symbol_rate;
float _lora_us_per_byte;
uint32_t _bitrate;
uint8_t _packet[255];
void (*_onReceive)(uint8_t, int);
};
class sx126x : public RadioInterface {
public:
sx126x(uint8_t index, SPIClass* spi, bool tcxo, bool dio2_as_rf_switch, int ss, int sclk, int mosi, int miso, int reset, int
dio0, int busy, int rxen);
int begin();
void end();
int beginPacket(int implicitHeader = false);
int endPacket();
int packetRssi();
int currentRssi();
uint8_t packetRssiRaw();
uint8_t currentRssiRaw();
uint8_t packetSnrRaw();
float packetSnr();
long packetFrequencyError();
// from Print
size_t write(uint8_t byte);
size_t write(const uint8_t *buffer, size_t size);
// from Stream
int available();
int read();
int peek();
void flush();
void onReceive(void(*callback)(uint8_t, int));
void receive(int size = 0);
void standby();
void sleep();
bool preInit();
uint8_t getTxPower();
void setTxPower(int level, int outputPin = PA_OUTPUT_PA_BOOST_PIN);
uint32_t getFrequency();
void setFrequency(uint32_t frequency);
void setSpreadingFactor(int sf);
uint8_t getSpreadingFactor();
uint32_t getSignalBandwidth();
void setSignalBandwidth(uint32_t sbw);
void setCodingRate4(int denominator);
uint8_t getCodingRate4();
void setPreambleLength(long length);
uint8_t modemStatus();
void enableCrc();
void disableCrc();
void enableTCXO();
void disableTCXO();
byte random();
void setSPIFrequency(uint32_t frequency);
void dumpRegisters(Stream& out);
void updateBitrate();
void handleDio0Rise();
private:
void writeBuffer(const uint8_t* buffer, size_t size);
void readBuffer(uint8_t* buffer, size_t size);
void loraMode();
void rxAntEnable();
void setPacketParams(uint32_t preamble, uint8_t headermode, uint8_t length, uint8_t crc);
void setModulationParams(uint8_t sf, uint8_t bw, uint8_t cr, int ldro);
void setSyncWord(uint16_t sw);
void waitOnBusy();
void executeOpcode(uint8_t opcode, uint8_t *buffer, uint8_t size);
void executeOpcodeRead(uint8_t opcode, uint8_t *buffer, uint8_t size);
void explicitHeaderMode();
void implicitHeaderMode();
uint8_t readRegister(uint16_t address);
void writeRegister(uint16_t address, uint8_t value);
uint8_t singleTransfer(uint8_t opcode, uint16_t address, uint8_t value);
static void onDio0Rise();
void handleLowDataRate();
void optimizeModemSensitivity();
void reset(void);
void calibrate(void);
void calibrate_image(uint32_t frequency);
bool getPacketValidity();
private:
SPISettings _spiSettings;
SPIClass* _spiModem;
int _ss;
int _sclk;
int _mosi;
int _miso;
int _reset;
int _dio0;
int _rxen;
int _busy;
uint32_t _frequency;
int _txp;
uint8_t _sf;
uint8_t _bw;
uint8_t _cr;
uint8_t _ldro;
int _packetIndex;
int _implicitHeaderMode;
int _payloadLength;
int _crcMode;
int _fifo_tx_addr_ptr;
int _fifo_rx_addr_ptr;
bool _preinit_done;
uint8_t _index;
bool _tcxo;
bool _dio2_as_rf_switch;
};
class sx127x : public RadioInterface {
public:
sx127x(uint8_t index, SPIClass* spi, int ss, int sclk, int mosi, int miso, int reset, int dio0, int busy);
int begin();
void end();
int beginPacket(int implicitHeader = false);
int endPacket();
int packetRssi();
int currentRssi();
uint8_t packetRssiRaw();
uint8_t currentRssiRaw();
uint8_t packetSnrRaw();
float packetSnr();
long packetFrequencyError();
// from Print
size_t write(uint8_t byte);
size_t write(const uint8_t *buffer, size_t size);
// from Stream
int available();
int read();
int peek();
void flush();
void onReceive(void(*callback)(uint8_t, int));
void receive(int size = 0);
void standby();
void sleep();
bool preInit();
uint8_t getTxPower();
void setTxPower(int level, int outputPin = PA_OUTPUT_PA_BOOST_PIN);
uint32_t getFrequency();
void setFrequency(uint32_t frequency);
void setSpreadingFactor(int sf);
uint8_t getSpreadingFactor();
uint32_t getSignalBandwidth();
void setSignalBandwidth(uint32_t sbw);
void setCodingRate4(int denominator);
uint8_t getCodingRate4();
void setPreambleLength(long length);
uint8_t modemStatus();
void enableCrc();
void disableCrc();
void enableTCXO();
void disableTCXO();
byte random();
void setSPIFrequency(uint32_t frequency);
void updateBitrate();
void handleDio0Rise();
bool getPacketValidity();
private:
void setSyncWord(uint8_t sw);
void explicitHeaderMode();
void implicitHeaderMode();
uint8_t readRegister(uint8_t address);
void writeRegister(uint8_t address, uint8_t value);
uint8_t singleTransfer(uint8_t address, uint8_t value);
static void onDio0Rise();
void handleLowDataRate();
void optimizeModemSensitivity();
private:
SPISettings _spiSettings;
SPIClass* _spiModem;
int _ss;
int _sclk;
int _mosi;
int _miso;
int _reset;
int _dio0;
int _busy;
uint32_t _frequency;
int _packetIndex;
int _implicitHeaderMode;
bool _preinit_done;
uint8_t _index;
uint8_t _sf;
uint8_t _cr;
};
class sx128x : public RadioInterface {
public:
sx128x(uint8_t index, SPIClass* spi, bool tcxo, int ss, int sclk, int mosi, int miso, int reset, int dio0, int busy, int rxen, int txen);
int begin();
void end();
int beginPacket(int implicitHeader = false);
int endPacket();
int packetRssi();
int currentRssi();
uint8_t packetRssiRaw();
uint8_t currentRssiRaw();
uint8_t packetSnrRaw();
float packetSnr();
long packetFrequencyError();
// from Print
size_t write(uint8_t byte);
size_t write(const uint8_t *buffer, size_t size);
// from Stream
int available();
int read();
int peek();
void flush();
void onReceive(void(*callback)(uint8_t, int));
void receive(int size = 0);
void standby();
void sleep();
bool preInit();
uint8_t getTxPower();
void setTxPower(int level, int outputPin = PA_OUTPUT_PA_BOOST_PIN);
uint32_t getFrequency();
void setFrequency(uint32_t frequency);
void setSpreadingFactor(int sf);
uint8_t getSpreadingFactor();
uint32_t getSignalBandwidth();
void setSignalBandwidth(uint32_t sbw);
void setCodingRate4(int denominator);
uint8_t getCodingRate4();
void setPreambleLength(long length);
uint8_t modemStatus();
void enableCrc();
void disableCrc();
void enableTCXO();
void disableTCXO();
byte random();
void setSPIFrequency(uint32_t frequency);
void dumpRegisters(Stream& out);
void updateBitrate();
void handleDio0Rise();
bool getPacketValidity();
private:
void writeBuffer(const uint8_t* buffer, size_t size);
void readBuffer(uint8_t* buffer, size_t size);
void txAntEnable();
void rxAntEnable();
void loraMode();
void waitOnBusy();
void executeOpcode(uint8_t opcode, uint8_t *buffer, uint8_t size);
void executeOpcodeRead(uint8_t opcode, uint8_t *buffer, uint8_t size);
void setPacketParams(uint32_t preamble, uint8_t headermode, uint8_t length, uint8_t crc);
void setModulationParams(uint8_t sf, uint8_t bw, uint8_t cr);
void setSyncWord(int sw);
void explicitHeaderMode();
void implicitHeaderMode();
uint8_t readRegister(uint16_t address);
void writeRegister(uint16_t address, uint8_t value);
uint8_t singleTransfer(uint8_t opcode, uint16_t address, uint8_t value);
static void onDio0Rise();
void handleLowDataRate();
void optimizeModemSensitivity();
private:
SPISettings _spiSettings;
SPIClass* _spiModem;
int _ss;
int _sclk;
int _mosi;
int _miso;
int _reset;
int _dio0;
int _rxen;
int _txen;
int _busy;
int _modem;
uint32_t _frequency;
int _txp;
uint8_t _sf;
uint8_t _bw;
uint8_t _cr;
int _packetIndex;
int _implicitHeaderMode;
int _payloadLength;
int _crcMode;
int _fifo_tx_addr_ptr;
int _fifo_rx_addr_ptr;
bool _preinit_done;
int _rxPacketLength;
uint8_t _index;
bool _tcxo;
};
#endif
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