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fix: enable LoRa CRC on SX127x for RNode interop #45

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Merged
attermann merged 1 commit into from
Apr 17, 2026
Merged

fix: enable LoRa CRC on SX127x for RNode interop #45

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7 changes: 7 additions & 0 deletions examples/common/lora_interface/LoRaInterface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,13 @@ bool LoRaInterface::start() {
// begin(freq MHz, bw kHz, sf, cr, syncWord, power dBm, preamble symbols, LNA gain 0=AGC)
int state = chip->begin(frequency, bandwidth, spreading, coding,
RADIOLIB_SX127X_SYNC_WORD, power, 20, 0);
// SX127x hardware default leaves RxPayloadCrcOn=0 and RadioLib's
// SX127x::begin() does not touch it. Upstream RNode firmware enables
// CRC unconditionally (sx127x::enableCrc, RNode_Firmware.ino:531), so
// real RNodes silently drop frames without a CRC. Enable it here to
// interoperate. SX126x branches below inherit CRC-on from
// SX126x::begin() (setCRC(2)), so no explicit call is needed there.
if (state == RADIOLIB_ERR_NONE) state = chip->setCRC(true);

#elif defined(BOARD_RAK4631)
// nRF52: SPI pins must be configured before SPI.begin()
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