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docs(gpio): add description for gpio_force_hold_all & gpio_force_unhold_all

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Closes https://github.com/espressif/esp-idf/issues/13186
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wuzhenghui 2024-02-21 14:46:52 +08:00
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1 changed files with 10 additions and 4 deletions
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14
components/esp_driver_gpio/include/driver/gpio.h
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@ -455,14 +455,20 @@ void gpio_iomux_out(uint8_t gpio_num, int func, bool oen_inv);
* This function will immediately cause all pads to latch the current values of input enable, output enable,
* output value, function, and drive strength values.
*
* @warning This function will hold flash and UART pins as well. Therefore, this function, and all code run afterwards
* (till calling `gpio_force_unhold_all` to disable this feature), MUST be placed in internal RAM as holding the flash
* pins will halt SPI flash operation, and holding the UART pins will halt any UART logging.
* @warning
* 1. This function will hold flash and UART pins as well. Therefore, this function, and all code run afterwards
* (till calling `gpio_force_unhold_all` to disable this feature), MUST be placed in internal RAM as holding the flash
* pins will halt SPI flash operation, and holding the UART pins will halt any UART logging.
* 2. The hold state of all pads will be cancelled during ROM boot, so it is not recommended to use this API to hold
* the pads state during deepsleep and reset.
* */
esp_err_t gpio_force_hold_all(void);
/**
* @brief Force unhold all digital and rtc gpio pads.
* @brief Unhold all digital and rtc gpio pads.
*
* @note The global hold signal and the hold signal of each IO act on the PAD through 'or' logic, so if a pad has already
* been configured to hold by `gpio_hold_en`, this API can't release its hold state.
* */
esp_err_t gpio_force_unhold_all(void);
#endif