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https://github.com/meshcore-dev/MeshCore.git
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70 lines
No EOL
2.5 KiB
C++
70 lines
No EOL
2.5 KiB
C++
#pragma once
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#include <RadioLib.h>
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#define LR1110_IRQ_HAS_PREAMBLE 0b0000000100 // 4 4 valid LoRa header received
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#define LR1110_IRQ_HEADER_VALID 0b0000010000 // 4 4 valid LoRa header received
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class CustomLR1110 : public LR1110 {
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public:
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CustomLR1110(Module *mod) : LR1110(mod) { }
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RadioLibTime_t getTimeOnAir(size_t len) override {
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// calculate number of symbols
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float N_symbol = 0;
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if(this->codingRate <= RADIOLIB_LR11X0_LORA_CR_4_8_SHORT) {
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// legacy coding rate - nice and simple
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// get SF coefficients
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float coeff1 = 0;
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int16_t coeff2 = 0;
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int16_t coeff3 = 0;
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if(this->spreadingFactor < 7) {
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// SF5, SF6
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coeff1 = 6.25;
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coeff2 = 4*this->spreadingFactor;
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coeff3 = 4*this->spreadingFactor;
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} else if(this->spreadingFactor < 11) {
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// SF7. SF8, SF9, SF10
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coeff1 = 4.25;
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coeff2 = 4*this->spreadingFactor + 8;
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coeff3 = 4*this->spreadingFactor;
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} else {
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// SF11, SF12
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coeff1 = 4.25;
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coeff2 = 4*this->spreadingFactor + 8;
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coeff3 = 4*(this->spreadingFactor - 2);
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}
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// get CRC length
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int16_t N_bitCRC = 16;
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if(this->crcTypeLoRa == RADIOLIB_LR11X0_LORA_CRC_DISABLED) {
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N_bitCRC = 0;
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}
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// get header length
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int16_t N_symbolHeader = 20;
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if(this->headerType == RADIOLIB_LR11X0_LORA_HEADER_IMPLICIT) {
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N_symbolHeader = 0;
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}
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// calculate number of LoRa preamble symbols - NO! Lora preamble is already in symbols
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// uint32_t N_symbolPreamble = (this->preambleLengthLoRa & 0x0F) * (uint32_t(1) << ((this->preambleLengthLoRa & 0xF0) >> 4));
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// calculate the number of symbols - nope
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// N_symbol = (float)N_symbolPreamble + coeff1 + 8.0f + ceilf((float)RADIOLIB_MAX((int16_t)(8 * len + N_bitCRC - coeff2 + N_symbolHeader), (int16_t)0) / (float)coeff3) * (float)(this->codingRate + 4);
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// calculate the number of symbols - using only preamblelora because it's already in symbols
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N_symbol = (float)preambleLengthLoRa + coeff1 + 8.0f + ceilf((float)RADIOLIB_MAX((int16_t)(8 * len + N_bitCRC - coeff2 + N_symbolHeader), (int16_t)0) / (float)coeff3) * (float)(this->codingRate + 4);
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} else {
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// long interleaving - not needed for this modem
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}
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// get time-on-air in us
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return(((uint32_t(1) << this->spreadingFactor) / this->bandwidthKhz) * N_symbol * 1000.0f);
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}
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bool isReceiving() {
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uint16_t irq = getIrqStatus();
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bool detected = ((irq & LR1110_IRQ_HEADER_VALID) || (irq & LR1110_IRQ_HAS_PREAMBLE));
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return detected;
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}
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}; |