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SX126x: re-apply 0x8B5 register in resetAGC() to preserve RX sensitivity #10219

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Merged
thebentern merged 1 commit into from
Apr 21, 2026
Merged

SX126x: re-apply 0x8B5 register in resetAGC() to preserve RX sensitivity #10219

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9 changes: 9 additions & 0 deletions src/mesh/SX126xInterface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -455,6 +455,15 @@ template <typename T> void SX126xInterface<T>::resetAGC()
// RX boosted gain mode
lora.setRxBoostedGainMode(config.lora.sx126x_rx_boosted_gain);

// Re-apply the undocumented 0x8B5 RX sensitivity patch that was set in init().
// The CALIBRATE_ALL (0x7F) command above clears bit 0 of register 0x8B5, which
// silently removes the RX sensitivity improvement introduced in #9571 / #9777.
// Without this re-apply, every SX1262 node loses its RX boost ~60s after boot
// and never recovers until reboot. See empirical evidence in the PR description.
if (module.SPIsetRegValue(0x8B5, 0x01, 0, 0) != RADIOLIB_ERR_NONE) {
LOG_WARN("SX126x resetAGC: failed to re-apply 0x8B5 RX sensitivity patch");
}

// 6. Resume receiving
startReceive();
}
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