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turn off brownout before deep sleep #4159

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Feb 9, 2021
Merged

turn off brownout before deep sleep #4159

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8 changes: 8 additions & 0 deletions ports/esp32s2/common-hal/alarm/__init__.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,14 @@ void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *ala
void NORETURN alarm_enter_deep_sleep(void) {
alarm_pin_pinalarm_prepare_for_deep_sleep();
alarm_touch_touchalarm_prepare_for_deep_sleep();

// Disable brownout detection, which appears to be triggered sometimes when
// waking from deep sleep.
// See https://www.esp32.com/viewtopic.php?f=13&t=19208#p71084
// and https://github.com/adafruit/circuitpython/issues/4025#issuecomment-771027606
// TODO: We can remove this workaround when ESP-IDF handles this.
CLEAR_PERI_REG_MASK(RTC_CNTL_BROWN_OUT_REG, RTC_CNTL_BROWN_OUT_RST_ENA);

// The ESP-IDF caches the deep sleep settings and applies them before sleep.
// We don't need to worry about resetting them in the interim.
esp_deep_sleep_start();
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