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fix(ble): Fixed Bluetooth not waking up due to clock drift

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This commit is contained in:
xiongweichao 2024-01-11 14:39:25 +08:00
parent 4ecc978bd6
commit 028f174467
1 changed files with 10 additions and 3 deletions
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13
components/bt/controller/esp32c3/bt.c
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@ -721,19 +721,26 @@ static void btdm_sleep_enter_phase1_wrapper(uint32_t lpcycles)
return;
}
// start a timer to wake up and acquire the pm_lock before modem_sleep awakes
uint32_t us_to_sleep = btdm_lpcycles_2_hus(lpcycles, NULL) >> 1;
#define BTDM_MIN_TIMER_UNCERTAINTY_US (1800)
#define BTDM_RTC_SLOW_CLK_RC_DRIFT (7 / 100)
assert(us_to_sleep > BTDM_MIN_TIMER_UNCERTAINTY_US);
// allow a maximum time uncertainty to be about 488ppm(1/2048) at least as clock drift
// and set the timer in advance
uint32_t uncertainty = (us_to_sleep >> 11);
#if CONFIG_FREERTOS_USE_TICKLESS_IDLE
if (rtc_clk_slow_src_get() == SOC_RTC_SLOW_CLK_SRC_RC_SLOW) {
uncertainty = us_to_sleep * BTDM_RTC_SLOW_CLK_RC_DRIFT;
}
#endif
if (uncertainty < BTDM_MIN_TIMER_UNCERTAINTY_US) {
uncertainty = BTDM_MIN_TIMER_UNCERTAINTY_US;
}
assert (s_lp_stat.wakeup_timer_started == 0);
// start a timer to wake up and acquire the pm_lock before modem_sleep awakes
if (esp_timer_start_once(s_btdm_slp_tmr, us_to_sleep - uncertainty) == ESP_OK) {
s_lp_stat.wakeup_timer_started = 1;
} else {
@ -752,12 +759,12 @@ static void btdm_sleep_enter_phase2_wrapper(void)
assert(0);
}
if (s_lp_stat.pm_lock_released == 0) {
#ifdef CONFIG_PM_ENABLE
if (s_lp_stat.pm_lock_released == 0) {
esp_pm_lock_release(s_pm_lock);
#endif
s_lp_stat.pm_lock_released = 1;
}
#endif
}
}