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make rx duty cycle tuning more easy

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liquidraver
2026-05-04 15:09:26 +02:00
parent 1a956aa86a
commit 9a1569c511
1 changed files with 9 additions and 27 deletions
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zephcore/adapters/radio/LoRaRadioBase.cpp
+9 -27
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@@ -23,6 +23,9 @@ static uint16_t preambleLengthForSF(uint8_t sf)
return (sf <= 8) ? 32 : 16;
}
static constexpr uint16_t RX_DUTY_RX_SYMBOLS = 10;
static constexpr uint16_t RX_DUTY_SLEEP_SYMBOLS = 6;
/* ── Constructor ─────────────────────────────────────────────── */
LoRaRadioBase::LoRaRadioBase(const struct device *lora_dev, MainBoard &board,
@@ -421,35 +424,18 @@ void LoRaRadioBase::startReceive()
int ret;
if (_rx_duty_cycle_enabled) {
/* Compute duty cycle timing from modem config (RadioLib algorithm).
* The driver converts these to hardware-specific units. */
/* Fixed duty-cycle window for field validation.
* Keep build-time tunable via constants above. */
struct lora_modem_config cfg;
buildModemConfig(cfg, false);
uint8_t sf = (uint8_t)cfg.datarate;
uint32_t bw_hz = bandwidth_to_hz(cfg.bandwidth);
float bw_khz = (float)bw_hz / 1000.0f;
/*uint16_t preamble_len = cfg.preamble_len;
Duty-cycle timing assumption only: keep windows compatible with
* meshes that commonly transmit with a 16-symbol preamble. */
uint16_t preamble_len = 16;
uint16_t min_symbols = (sf >= 7) ? 8 : 12;
int16_t sleep_symbols = (int16_t)preamble_len -
(int16_t)min_symbols;
if (sleep_symbols > 0) {
uint32_t symbol_us = (uint32_t)((float)(1 << sf) *
1000.0f / bw_khz);
int16_t safe = sleep_symbols - 2;
if (safe < 1) safe = 1;
uint32_t sleep_us = (uint16_t)safe * symbol_us;
uint32_t preamble_us = (preamble_len + 1) * symbol_us;
int32_t w1 = ((int32_t)preamble_us -
((int32_t)sleep_us - 1000)) / 2;
uint32_t w2 = (min_symbols + 2) * symbol_us;
uint32_t rx_us = (w1 > 0 && (uint32_t)w1 > w2)
? (uint32_t)w1 : w2;
if (bw_khz > 0.0f) {
uint32_t symbol_us = (uint32_t)((float)(1 << sf) * 1000.0f / bw_khz);
uint32_t rx_us = RX_DUTY_RX_SYMBOLS * symbol_us;
uint32_t sleep_us = RX_DUTY_SLEEP_SYMBOLS * symbol_us;
ret = lora_recv_duty_cycle(_dev,
K_USEC(rx_us),
@@ -462,10 +448,6 @@ void LoRaRadioBase::startReceive()
if (ret != -ENOSYS) {
LOG_ERR("lora_recv_duty_cycle failed: %d", ret);
}
} else {
LOG_WRN("Preamble too short for duty cycle "
"(need >%d, have %d)",
min_symbols, preamble_len);
}
/* Fall through to normal recv_async */
}