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False preamble detection on SX1262

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Mark Qvist 2025-01-16 23:33:49 +01:00
parent 4bdd30daac
commit 3ae8982e93
1 changed files with 15 additions and 9 deletions
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24
sx126x.cpp
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@ -390,29 +390,35 @@ int sx126x::endPacket() {
}
unsigned long preamble_detected_at = 0;
unsigned long header_detected_at = 0;
extern long lora_preamble_time_ms;
extern long lora_header_time_ms;
bool false_preamble_detected = false;
bool sx126x::dcd() {
bool carrier_detected = false;
uint8_t buf[2] = {0}; executeOpcodeRead(OP_GET_IRQ_STATUS_6X, buf, 2);
uint32_t now = millis();
bool header_detected = false;
bool carrier_detected = false;
if ((buf[1] & IRQ_HEADER_DET_MASK_6X) != 0) { header_detected = true; carrier_detected = true; }
else { header_detected = false; }
if ((buf[1] & IRQ_PREAMBLE_DET_MASK_6X) != 0) {
carrier_detected = true;
if (preamble_detected_at == 0) preamble_detected_at = millis();
if (millis() - preamble_detected_at > lora_preamble_time_ms + lora_header_time_ms) {
if (preamble_detected_at == 0) { preamble_detected_at = now; }
if (now - preamble_detected_at > lora_preamble_time_ms + lora_header_time_ms) {
preamble_detected_at = 0;
if (!header_detected) { false_preamble_detected = true; }
uint8_t clearbuf[2] = {0};
clearbuf[1] = IRQ_PREAMBLE_DET_MASK_6X;
executeOpcode(OP_CLEAR_IRQ_STATUS_6X, clearbuf, 2);
}
}
if ((buf[1] & IRQ_HEADER_DET_MASK_6X) != 0) {
carrier_detected = true;
header_detected_at = millis();
}
// TODO: Maybe there's a way of unlatching the RSSI
// status without re-activating receive mode?
if (false_preamble_detected) { sx126x_modem.receive(); false_preamble_detected = false; }
return carrier_detected;
}