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rx duty cycle, sleep only 6 symbols

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liquidraver
2026-02-22 16:48:40 +01:00
parent 1332df0461
commit 63a63ca998
2 changed files with 17 additions and 4 deletions
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zephcore/adapters/radio/SX126xRadio.cpp
+9 -2
View File
@@ -201,8 +201,15 @@ void SX126xRadio::applyRxDutyCycleIfEnabled()
return;
}
uint32_t symbol_us = ((uint32_t)(1 << sf) * 1000) / (uint32_t)bw_khz;
uint32_t sleep_period_us = sleep_symbols * symbol_us;
uint32_t symbol_us = (uint32_t)((float)(1 << sf) * 1000.0f / bw_khz);
/* Shave 2 symbols off the sleep period so the wake window always overlaps
with enough preamble for detection, even in the worst-case arrival timing.
Without this margin the math lands at exactly zero — any TCXO drift,
crystal error, or processing latency causes missed packets. */
int16_t sleep_symbols_safe = sleep_symbols - 2;
if (sleep_symbols_safe < 1) sleep_symbols_safe = 1;
uint32_t sleep_period_us = (uint16_t)sleep_symbols_safe * symbol_us;
uint32_t preamble_total_us = (preamble_len + 1) * symbol_us;
int32_t wake_calc1 = ((int32_t)preamble_total_us -
zephcore/patches/zephyr-new/drivers/lora/lr11xx/lr11xx_lora.c
+8 -2
View File
@@ -258,8 +258,14 @@ static void lr11xx_apply_rx_duty_cycle(struct lr11xx_data *data)
return;
}
uint32_t symbol_us = ((uint32_t)(1 << sf) * 1000) / (uint32_t)bw_khz;
uint32_t sleep_period_us = sleep_symbols * symbol_us;
uint32_t symbol_us = (uint32_t)((float)(1 << sf) * 1000.0f / bw_khz);
/* Shave 2 symbols off sleep so the wake window always has enough
preamble overlap for detection. Without this the margin is zero
and any TCXO drift or crystal error causes missed packets. */
int16_t sleep_symbols_safe = sleep_symbols - 2;
if (sleep_symbols_safe < 1) sleep_symbols_safe = 1;
uint32_t sleep_period_us = (uint16_t)sleep_symbols_safe * symbol_us;
uint32_t preamble_total_us = (preamble_len + 1) * symbol_us;
int32_t wake_calc1 = ((int32_t)preamble_total_us -
((int32_t)sleep_period_us - 1000)) / 2;