## 調用方法：
`ESP32.getWakeupCause()`
## 返回
ESP32 從睡眠中喚醒的原因
## 描述
返回一個變量，用于標識從深度睡眠中喚醒的原因。可能的原因包括：
* `0:ESP_SLEEP_WAKEUP_UNDEFINED` - 重置不是由退出深度睡眠引起的
* `2:ESP_SLEEP_WAKEUP_EXT0` - 使用`RTC_IO`的外部信號引起的喚醒
* `3:ESP_SLEEP_WAKEUP_EXT1` - 使用`RTC_CNTL`的外部信號引起的喚醒
* `4:ESP_SLEEP_WAKEUP_TIMER` - 計時器引起的喚醒
* `5:ESP_SLEEP_WAKEUP_TOUCHPAD` - 觸摸板引起的喚醒
* `6:ESP_SLEEP_WAKEUP_ULP` - ULP 程序引起的喚醒
**注意：** 這僅在 ESP32 開發板中可用
- Espruino簡介
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