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LNA offset value #1395

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LNA offset value #1395

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0c685ad
Added in an rssi offset for nodes with an LNA such as a heltec v4. Th…
OverkillFPV Jan 14, 2026
81b8f72
Update src/helpers/radiolib/CustomSX1262Wrapper.h
OverkillFPV Jan 14, 2026
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10 changes: 8 additions & 2 deletions src/helpers/radiolib/CustomSX1262Wrapper.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,22 @@
#include "CustomSX1262.h"
#include "RadioLibWrappers.h"

// RSSI_OFFSET is used to compensate for external LNA gain (e.g. Heltec V4)
// Set to a negative value equal to the LNA gain to get true RSSI values
#ifndef RSSI_OFFSET
#define RSSI_OFFSET 0
#endif

class CustomSX1262Wrapper : public RadioLibWrapper {
public:
CustomSX1262Wrapper(CustomSX1262& radio, mesh::MainBoard& board) : RadioLibWrapper(radio, board) { }
bool isReceivingPacket() override {
return ((CustomSX1262 *)_radio)->isReceiving();
}
float getCurrentRSSI() override {
return ((CustomSX1262 *)_radio)->getRSSI(false);
return ((CustomSX1262 *)_radio)->getRSSI(false) + RSSI_OFFSET;
}
float getLastRSSI() const override { return ((CustomSX1262 *)_radio)->getRSSI(); }
float getLastRSSI() const override { return ((CustomSX1262 *)_radio)->getRSSI() + RSSI_OFFSET; }
float getLastSNR() const override { return ((CustomSX1262 *)_radio)->getSNR(); }

float packetScore(float snr, int packet_len) override {
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1 change: 1 addition & 0 deletions variants/heltec_v4/platformio.ini
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Expand Up @@ -31,6 +31,7 @@ build_flags =
-D SX126X_DIO3_TCXO_VOLTAGE=1.8
-D SX126X_CURRENT_LIMIT=140
-D SX126X_RX_BOOSTED_GAIN=1
-D RSSI_OFFSET=-17 ; GC1109 LNA gain compensation (17dB) - subtract to get true RSSI
-D PIN_GPS_RX=38
-D PIN_GPS_TX=39
-D PIN_GPS_RESET=42
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