reduce the minimum delay uncertainty of esp_timer for Bluetooth modem sleep from 1.8ms to 0.5ms for lower power consumption
@@ -818,7 +818,7 @@ static void btdm_sleep_enter_phase1_wrapper(uint32_t lpcycles)
// start a timer to wake up and acquire the pm_lock before modem_sleep awakes
uint32_t us_to_sleep = btdm_lpcycles_2_us(lpcycles);
-#define BTDM_MIN_TIMER_UNCERTAINTY_US (1800)
+#define BTDM_MIN_TIMER_UNCERTAINTY_US (500)
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
