Chapter 2. API Reference
esp_err_t rtc_gpio_pullup_en(gpio_num_t gpio_num)
RTC GPIO pullup enable.
This function only works for RTC IOs. In general, call gpio_pullup_en, which will work both for normal
GPIOs and RTC IOs.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG GPIO is not an RTC IO
Parameters
• gpio_num: GPIO number (e.g. GPIO_NUM_12)
esp_err_t rtc_gpio_pulldown_en(gpio_num_t gpio_num)
RTC GPIO pulldown enable.
This function only works for RTC IOs. In general, call gpio_pulldown_en, which will work both for normal
GPIOs and RTC IOs.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG GPIO is not an RTC IO
Parameters
• gpio_num: GPIO number (e.g. GPIO_NUM_12)
esp_err_t rtc_gpio_pullup_dis(gpio_num_t gpio_num)
RTC GPIO pullup disable.
This function only works for RTC IOs. In general, call gpio_pullup_dis, which will work both for normal
GPIOs and RTC IOs.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG GPIO is not an RTC IO
Parameters
• gpio_num: GPIO number (e.g. GPIO_NUM_12)
esp_err_t rtc_gpio_pulldown_dis(gpio_num_t gpio_num)
RTC GPIO pulldown disable.
This function only works for RTC IOs. In general, call gpio_pulldown_dis, which will work both for normal
GPIOs and RTC IOs.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG GPIO is not an RTC IO
Parameters
• gpio_num: GPIO number (e.g. GPIO_NUM_12)
esp_err_t rtc_gpio_set_drive_capability(gpio_num_t gpio_num, gpio_drive_cap_t strength)
Set RTC GPIO pad drive capability.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG Parameter error
Parameters
• gpio_num: GPIO number, only support output GPIOs
• strength: Drive capability of the pad
esp_err_t rtc_gpio_get_drive_capability(gpio_num_t gpio_num, gpio_drive_cap_t *strength)
Get RTC GPIO pad drive capability.
Return
• ESP_OK Success
• ESP_ERR_INVALID_ARG Parameter error
Parameters
• gpio_num: GPIO number, only support output GPIOs
Espressif Systems 265
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