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551 lines
16 KiB
C++
551 lines
16 KiB
C++
#include "SX1278Better.h"
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SX1278Better::SX1278Better(Module* mod) : SX127x(mod) {
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}
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int16_t SX1278Better::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t syncWord, int8_t power, uint16_t preambleLength, uint8_t gain) {
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// execute common part
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int16_t state = SX127x::begin(SX1278_CHIP_VERSION, syncWord, preambleLength);
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RADIOLIB_ASSERT(state);
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// configure publicly accessible settings
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state = setBandwidth(bw);
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RADIOLIB_ASSERT(state);
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state = setFrequency(freq);
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RADIOLIB_ASSERT(state);
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state = setSpreadingFactor(sf);
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RADIOLIB_ASSERT(state);
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state = setCodingRate(cr);
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RADIOLIB_ASSERT(state);
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state = setOutputPower(power);
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RADIOLIB_ASSERT(state);
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state = setGain(gain);
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RADIOLIB_ASSERT(state);
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return(state);
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}
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int16_t SX1278Better::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
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// execute common part
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int16_t state = SX127x::beginFSK(SX1278_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
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RADIOLIB_ASSERT(state);
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// configure settings not accessible by API
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state = configFSK();
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RADIOLIB_ASSERT(state);
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// configure publicly accessible settings
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state = setFrequency(freq);
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RADIOLIB_ASSERT(state);
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state = setOutputPower(power);
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RADIOLIB_ASSERT(state);
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state = setDataShaping(RADIOLIB_SHAPING_NONE);
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RADIOLIB_ASSERT(state);
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return(state);
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}
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void SX1278Better::reset() {
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Module::pinMode(_mod->getRst(), OUTPUT);
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Module::digitalWrite(_mod->getRst(), LOW);
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Module::delay(1);
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Module::digitalWrite(_mod->getRst(), HIGH);
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Module::delay(5);
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}
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int16_t SX1278Better::setFrequency(float freq) {
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RADIOLIB_CHECK_RANGE(freq, 137.0, 525.0, ERR_INVALID_FREQUENCY);
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// SX1276/77/78 Errata fixes
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if(getActiveModem() == SX127X_LORA) {
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// sensitivity optimization for 500kHz bandwidth
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// see SX1276/77/78 Errata, section 2.1 for details
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if(abs(_bw - 500.0) <= 0.001) {
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if((freq >= 862.0) && (freq <= 1020.0)) {
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_mod->SPIwriteRegister(0x36, 0x02);
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_mod->SPIwriteRegister(0x3a, 0x64);
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} else if((freq >= 410.0) && (freq <= 525.0)) {
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_mod->SPIwriteRegister(0x36, 0x02);
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_mod->SPIwriteRegister(0x3a, 0x7F);
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}
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}
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// mitigation of receiver spurious response
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// see SX1276/77/78 Errata, section 2.3 for details
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if(abs(_bw - 7.8) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x48);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 7.8;
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} else if(abs(_bw - 10.4) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x44);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 10.4;
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} else if(abs(_bw - 15.6) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x44);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 15.6;
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} else if(abs(_bw - 20.8) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x44);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 20.8;
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} else if(abs(_bw - 31.25) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x44);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 31.25;
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} else if(abs(_bw - 41.7) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x44);
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_mod->SPIsetRegValue(0x30, 0x00);
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freq += 41.7;
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} else if(abs(_bw - 62.5) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x40);
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_mod->SPIsetRegValue(0x30, 0x00);
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} else if(abs(_bw - 125.0) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x40);
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_mod->SPIsetRegValue(0x30, 0x00);
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} else if(abs(_bw - 250.0) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b0000000, 7, 7);
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_mod->SPIsetRegValue(0x2F, 0x40);
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_mod->SPIsetRegValue(0x30, 0x00);
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} else if(abs(_bw - 500.0) <= 0.001) {
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_mod->SPIsetRegValue(0x31, 0b1000000, 7, 7);
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}
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}
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// set frequency and if successful, save the new setting
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int16_t state = SX127x::setFrequencyRaw(freq);
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if(state == ERR_NONE) {
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SX127x::_freq = freq;
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}
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return(state);
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}
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int16_t SX1278Better::setBandwidth(float bw) {
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// check active modem
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if(getActiveModem() != SX127X_LORA) {
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return(ERR_WRONG_MODEM);
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}
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uint8_t newBandwidth;
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// check allowed bandwidth values
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if(abs(bw - 7.8) <= 0.001) {
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newBandwidth = SX1278_BW_7_80_KHZ;
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} else if(abs(bw - 10.4) <= 0.001) {
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newBandwidth = SX1278_BW_10_40_KHZ;
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} else if(abs(bw - 15.6) <= 0.001) {
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newBandwidth = SX1278_BW_15_60_KHZ;
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} else if(abs(bw - 20.8) <= 0.001) {
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newBandwidth = SX1278_BW_20_80_KHZ;
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} else if(abs(bw - 31.25) <= 0.001) {
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newBandwidth = SX1278_BW_31_25_KHZ;
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} else if(abs(bw - 41.7) <= 0.001) {
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newBandwidth = SX1278_BW_41_70_KHZ;
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} else if(abs(bw - 62.5) <= 0.001) {
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newBandwidth = SX1278_BW_62_50_KHZ;
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} else if(abs(bw - 125.0) <= 0.001) {
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newBandwidth = SX1278_BW_125_00_KHZ;
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} else if(abs(bw - 250.0) <= 0.001) {
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newBandwidth = SX1278_BW_250_00_KHZ;
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} else if(abs(bw - 500.0) <= 0.001) {
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newBandwidth = SX1278_BW_500_00_KHZ;
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} else {
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return(ERR_INVALID_BANDWIDTH);
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}
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// set bandwidth and if successful, save the new setting
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int16_t state = SX1278::setBandwidthRaw(newBandwidth);
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if(state == ERR_NONE) {
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SX127x::_bw = bw;
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// calculate symbol length and set low data rate optimization, if auto-configuration is enabled
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if(_ldroAuto) {
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float symbolLength = (float)(uint32_t(1) << SX127x::_sf) / (float)SX127x::_bw;
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RADIOLIB_DEBUG_PRINT("Symbol length: ");
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RADIOLIB_DEBUG_PRINT(symbolLength);
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RADIOLIB_DEBUG_PRINTLN(" ms");
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if(symbolLength >= 16.0) {
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state = _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_ON, 3, 3);
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} else {
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state = _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_OFF, 3, 3);
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}
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}
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}
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return(state);
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}
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int16_t SX1278Better::setSpreadingFactor(uint8_t sf) {
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// check active modem
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if(getActiveModem() != SX127X_LORA) {
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return(ERR_WRONG_MODEM);
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}
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uint8_t newSpreadingFactor;
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// check allowed spreading factor values
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switch(sf) {
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case 6:
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newSpreadingFactor = SX127X_SF_6;
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break;
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case 7:
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newSpreadingFactor = SX127X_SF_7;
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break;
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case 8:
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newSpreadingFactor = SX127X_SF_8;
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break;
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case 9:
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newSpreadingFactor = SX127X_SF_9;
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break;
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case 10:
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newSpreadingFactor = SX127X_SF_10;
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break;
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case 11:
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newSpreadingFactor = SX127X_SF_11;
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break;
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case 12:
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newSpreadingFactor = SX127X_SF_12;
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break;
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default:
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return(ERR_INVALID_SPREADING_FACTOR);
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}
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// set spreading factor and if successful, save the new setting
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int16_t state = SX1278::setSpreadingFactorRaw(newSpreadingFactor);
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if(state == ERR_NONE) {
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SX127x::_sf = sf;
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// calculate symbol length and set low data rate optimization, if auto-configuration is enabled
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if(_ldroAuto) {
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float symbolLength = (float)(uint32_t(1) << SX127x::_sf) / (float)SX127x::_bw;
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RADIOLIB_DEBUG_PRINT("Symbol length: ");
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RADIOLIB_DEBUG_PRINT(symbolLength);
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RADIOLIB_DEBUG_PRINTLN(" ms");
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if(symbolLength >= 16.0) {
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state = _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_ON, 3, 3);
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} else {
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state = _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_OFF, 3, 3);
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}
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}
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}
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return(state);
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}
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int16_t SX1278Better::setCodingRate(uint8_t cr) {
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// check active modem
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if(getActiveModem() != SX127X_LORA) {
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return(ERR_WRONG_MODEM);
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}
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uint8_t newCodingRate;
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// check allowed coding rate values
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switch(cr) {
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case 5:
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newCodingRate = SX1278_CR_4_5;
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break;
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case 6:
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newCodingRate = SX1278_CR_4_6;
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break;
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case 7:
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newCodingRate = SX1278_CR_4_7;
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break;
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case 8:
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newCodingRate = SX1278_CR_4_8;
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break;
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default:
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return(ERR_INVALID_CODING_RATE);
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}
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// set coding rate and if successful, save the new setting
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int16_t state = SX1278::setCodingRateRaw(newCodingRate);
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if(state == ERR_NONE) {
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SX127x::_cr = cr;
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}
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return(state);
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}
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int16_t SX1278Better::setOutputPower(int8_t power) {
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// check allowed power range
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if(!(((power >= -3) && (power <= 17)) || (power == 20))) {
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return(ERR_INVALID_OUTPUT_POWER);
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}
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// set mode to standby
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int16_t state = SX127x::standby();
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// set output power
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if(power < 2) {
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// power is less than 2 dBm, enable PA on RFO
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX127X_PA_SELECT_RFO, 7, 7);
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX1278_LOW_POWER | (power + 3), 6, 0);
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state |= _mod->SPIsetRegValue(SX1278_REG_PA_DAC, SX127X_PA_BOOST_OFF, 2, 0);
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} else if(power <= 17) {
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// power is 2 - 17 dBm, enable PA1 + PA2 on PA_BOOST
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX127X_PA_SELECT_BOOST, 7, 7);
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX1278_MAX_POWER | (power - 2), 6, 0);
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state |= _mod->SPIsetRegValue(SX1278_REG_PA_DAC, SX127X_PA_BOOST_OFF, 2, 0);
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} else if(power == 20) {
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// power is 20 dBm, enable PA1 + PA2 on PA_BOOST and enable high power mode
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX127X_PA_SELECT_BOOST, 7, 7);
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_CONFIG, SX1278_MAX_POWER | (power - 5), 6, 0);
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state |= _mod->SPIsetRegValue(SX1278_REG_PA_DAC, SX127X_PA_BOOST_ON, 2, 0);
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}
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return(state);
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}
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int16_t SX1278Better::setGain(uint8_t gain) {
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// check active modem
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if(getActiveModem() != SX127X_LORA) {
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return(ERR_WRONG_MODEM);
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}
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// check allowed range
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if(gain > 6) {
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return(ERR_INVALID_GAIN);
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}
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// set mode to standby
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int16_t state = SX127x::standby();
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// set gain
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if(gain == 0) {
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// gain set to 0, enable AGC loop
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state |= _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_AGC_AUTO_ON, 2, 2);
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} else {
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state |= _mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_AGC_AUTO_OFF, 2, 2);
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state |= _mod->SPIsetRegValue(SX127X_REG_LNA, (gain << 5) | SX127X_LNA_BOOST_ON);
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}
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return(state);
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}
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int16_t SX1278Better::setDataShaping(uint8_t sh) {
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// check active modem
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if(getActiveModem() != SX127X_FSK_OOK) {
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return(ERR_WRONG_MODEM);
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}
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// check modulation
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if(SX127x::_ook) {
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return(ERR_INVALID_MODULATION);
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}
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// set mode to standby
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int16_t state = SX127x::standby();
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RADIOLIB_ASSERT(state);
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// set data shaping
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switch(sh) {
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case RADIOLIB_SHAPING_NONE:
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return(_mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_NO_SHAPING, 6, 5));
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case RADIOLIB_SHAPING_0_3:
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return(_mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_FSK_GAUSSIAN_0_3, 6, 5));
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case RADIOLIB_SHAPING_0_5:
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return(_mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_FSK_GAUSSIAN_0_5, 6, 5));
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case RADIOLIB_SHAPING_1_0:
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return(_mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_FSK_GAUSSIAN_1_0, 6, 5));
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default:
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return(ERR_INVALID_DATA_SHAPING);
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}
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}
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int16_t SX1278Better::setDataShapingOOK(uint8_t sh) {
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// check active modem
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if(getActiveModem() != SX127X_FSK_OOK) {
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return(ERR_WRONG_MODEM);
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}
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// check modulation
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if(!SX127x::_ook) {
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return(ERR_INVALID_MODULATION);
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}
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// set mode to standby
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int16_t state = SX127x::standby();
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// set data shaping
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switch(sh) {
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case 0:
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_NO_SHAPING, 6, 5);
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break;
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case 1:
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_OOK_FILTER_BR, 6, 5);
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break;
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case 2:
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state |= _mod->SPIsetRegValue(SX127X_REG_PA_RAMP, SX1278_OOK_FILTER_2BR, 6, 5);
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break;
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default:
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return(ERR_INVALID_DATA_SHAPING);
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}
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return(state);
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}
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float SX1278Better::getRSSI() {
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if(getActiveModem() == SX127X_LORA) {
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// for LoRa, get RSSI of the last packet
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float lastPacketRSSI;
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// RSSI calculation uses different constant for low-frequency and high-frequency ports
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if(_freq < 868.0) {
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lastPacketRSSI = -164 + _mod->SPIgetRegValue(SX127X_REG_PKT_RSSI_VALUE);
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} else {
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lastPacketRSSI = -157 + _mod->SPIgetRegValue(SX127X_REG_PKT_RSSI_VALUE);
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}
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// spread-spectrum modulation signal can be received below noise floor
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// check last packet SNR and if it's less than 0, add it to reported RSSI to get the correct value
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float lastPacketSNR = SX127x::getSNR();
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if(lastPacketSNR < 0.0) {
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lastPacketRSSI += lastPacketSNR;
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}
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return(lastPacketRSSI);
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} else {
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// enable listen mode
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startReceive();
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// read the value for FSK
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float rssi = (float)_mod->SPIgetRegValue(SX127X_REG_RSSI_VALUE_FSK) / -2.0;
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// set mode back to standby
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standby();
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// return the value
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return(rssi);
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}
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}
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int16_t SX1278Better::setCRC(bool enableCRC) {
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if(getActiveModem() == SX127X_LORA) {
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// set LoRa CRC
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SX127x::_crcEnabled = enableCRC;
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if(enableCRC) {
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return(_mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_2, SX1278_RX_CRC_MODE_ON, 2, 2));
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} else {
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return(_mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_2, SX1278_RX_CRC_MODE_OFF, 2, 2));
|
|
}
|
|
} else {
|
|
// set FSK CRC
|
|
if(enableCRC) {
|
|
return(_mod->SPIsetRegValue(SX127X_REG_PACKET_CONFIG_1, SX127X_CRC_ON, 4, 4));
|
|
} else {
|
|
return(_mod->SPIsetRegValue(SX127X_REG_PACKET_CONFIG_1, SX127X_CRC_OFF, 4, 4));
|
|
}
|
|
}
|
|
}
|
|
|
|
int16_t SX1278Better::forceLDRO(bool enable) {
|
|
if(getActiveModem() != SX127X_LORA) {
|
|
return(ERR_WRONG_MODEM);
|
|
}
|
|
|
|
_ldroAuto = false;
|
|
if(enable) {
|
|
return(_mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_ON, 3, 3));
|
|
} else {
|
|
return(_mod->SPIsetRegValue(SX1278_REG_MODEM_CONFIG_3, SX1278_LOW_DATA_RATE_OPT_OFF, 3, 3));
|
|
}
|
|
}
|
|
|
|
int16_t SX1278Better::autoLDRO() {
|
|
if(getActiveModem() != SX127X_LORA) {
|
|
return(ERR_WRONG_MODEM);
|
|
}
|
|
|
|
_ldroAuto = true;
|
|
return(ERR_NONE);
|
|
}
|
|
|
|
int16_t SX1278Better::implicitHeader(size_t len) {
|
|
return(setHeaderType(SX1278_HEADER_IMPL_MODE, len));
|
|
}
|
|
|
|
int16_t SX1278Better::explicitHeader() {
|
|
return(setHeaderType(SX1278_HEADER_EXPL_MODE));
|
|
}
|
|
|
|
int16_t SX1278Better::setBandwidthRaw(uint8_t newBandwidth) {
|
|
// set mode to standby
|
|
int16_t state = SX127x::standby();
|
|
|
|
// write register
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_1, newBandwidth, 7, 4);
|
|
return(state);
|
|
}
|
|
|
|
int16_t SX1278Better::setSpreadingFactorRaw(uint8_t newSpreadingFactor) {
|
|
// set mode to standby
|
|
int16_t state = SX127x::standby();
|
|
|
|
// write registers
|
|
if(newSpreadingFactor == SX127X_SF_6) {
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_1, SX1278_HEADER_IMPL_MODE, 0, 0);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_2, SX127X_SF_6 | SX127X_TX_MODE_SINGLE | (SX127x::_crcEnabled ? SX1278_RX_CRC_MODE_ON : SX1278_RX_CRC_MODE_OFF), 7, 2);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_DETECT_OPTIMIZE, SX127X_DETECT_OPTIMIZE_SF_6, 2, 0);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_DETECTION_THRESHOLD, SX127X_DETECTION_THRESHOLD_SF_6);
|
|
} else {
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_1, SX1278_HEADER_EXPL_MODE, 0, 0);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_2, newSpreadingFactor | SX127X_TX_MODE_SINGLE | (SX127x::_crcEnabled ? SX1278_RX_CRC_MODE_ON : SX1278_RX_CRC_MODE_OFF), 7, 2);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_DETECT_OPTIMIZE, SX127X_DETECT_OPTIMIZE_SF_7_12, 2, 0);
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_DETECTION_THRESHOLD, SX127X_DETECTION_THRESHOLD_SF_7_12);
|
|
}
|
|
return(state);
|
|
}
|
|
|
|
int16_t SX1278Better::setCodingRateRaw(uint8_t newCodingRate) {
|
|
// set mode to standby
|
|
int16_t state = SX127x::standby();
|
|
|
|
// write register
|
|
state |= _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_1, newCodingRate, 3, 1);
|
|
return(state);
|
|
}
|
|
|
|
int16_t SX1278Better::setHeaderType(uint8_t headerType, size_t len) {
|
|
// check active modem
|
|
if(getActiveModem() != SX127X_LORA) {
|
|
return(ERR_WRONG_MODEM);
|
|
}
|
|
|
|
// set requested packet mode
|
|
int16_t state = _mod->SPIsetRegValue(SX127X_REG_MODEM_CONFIG_1, headerType, 0, 0);
|
|
RADIOLIB_ASSERT(state);
|
|
|
|
// set length to register
|
|
state = _mod->SPIsetRegValue(SX127X_REG_PAYLOAD_LENGTH, len);
|
|
RADIOLIB_ASSERT(state);
|
|
|
|
// update cached value
|
|
_packetLength = len;
|
|
|
|
return(state);
|
|
}
|
|
|
|
int16_t SX1278Better::configFSK() {
|
|
// configure common registers
|
|
int16_t state = SX127x::configFSK();
|
|
RADIOLIB_ASSERT(state);
|
|
|
|
// set fast PLL hop
|
|
state = _mod->SPIsetRegValue(SX1278_REG_PLL_HOP, SX127X_FAST_HOP_ON, 7, 7);
|
|
return(state);
|
|
}
|
|
|
|
#endif
|