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better handling of packet SNR, which can be a negative number and is stored in the register as twos complement

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This commit is contained in:
Morgan 'ARR\!' Allen 2023-10-26 13:13:16 -07:00
parent 71d4c2998f
commit c84edc3bf1
2 changed files with 14 additions and 3 deletions
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15
src/LoRa.cpp
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@ -270,9 +270,20 @@ int LoRaClass::packetRssi()
return (readRegister(REG_PKT_RSSI_VALUE) - (_frequency < RF_MID_BAND_THRESHOLD ? RSSI_OFFSET_LF_PORT : RSSI_OFFSET_HF_PORT));
}
float LoRaClass::packetSnr()
int LoRaClass::packetSnr()
{
return ((int8_t)readRegister(REG_PKT_SNR_VALUE)) * 0.25;
int8_t snr = readRegister(REG_PKT_SNR_VALUE);
// check for two's complement negetive value
if(snr & 0x80) {
// invert value, increment by 1 and divide by 4 with >> 2 to avoid float
snr = ((~snr + 1) & 0xFF) >> 2;
} else {
// positive value only needs to be divided by 4
snr = snr >> 2;
}
return snr;
}
long LoRaClass::packetFrequencyError()

2
src/LoRa.h
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@ -42,7 +42,7 @@ public:
int parsePacket(int size = 0);
int packetRssi();
float packetSnr();
int packetSnr();
long packetFrequencyError();
int rssi();