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gpio_deep_sleep_hold_en

esp_idf_sys

Function gpio_deep_sleep_hold_en 

Source 
pub unsafe extern "C" fn gpio_deep_sleep_hold_en()
Expand description

@brief Enable all digital gpio pads hold function during Deep-sleep.

Enabling this feature makes all digital gpio pads be at the holding state during Deep-sleep. The state of each pad holds is its active configuration (not pad’s sleep configuration!).

Note:

  1. For digital IO, this API takes effect only if the corresponding digital IO pad hold function has been enabled. You can enable the GPIO pad hold function by calling gpio_hold_en. has been enabled. You can call gpio_hold_en to enable the gpio pad hold function.
  2. Though this API targets all digital IOs, the pad hold feature only works when the chip is in Deep-sleep mode. When the chip is in active mode, the digital GPIO state can be changed freely even if you have called this function, except for IOs that are already held by gpio_hold_en.

After this API is being called, the digital gpio Deep-sleep hold feature will work during every sleep process. You should call gpio_deep_sleep_hold_dis to disable this feature.