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reduce the minimum delay uncertainty of esp_timer for Bluetooth modem sleep from 1.8ms to 0.5ms for lower power consumption
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@ -818,7 +818,7 @@ static void btdm_sleep_enter_phase1_wrapper(uint32_t lpcycles)
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// start a timer to wake up and acquire the pm_lock before modem_sleep awakes
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uint32_t us_to_sleep = btdm_lpcycles_2_us(lpcycles);
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#define BTDM_MIN_TIMER_UNCERTAINTY_US (1800)
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#define BTDM_MIN_TIMER_UNCERTAINTY_US (500)
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assert(us_to_sleep > BTDM_MIN_TIMER_UNCERTAINTY_US);
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// allow a maximum time uncertainty to be about 488ppm(1/2048) at least as clock drift
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// and set the timer in advance
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