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driver/rtc: add rtc_gpio_isolate helper function to disconnect RTC IO

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This commit is contained in:
Ivan Grokhotkov 2018-02-10 00:28:30 +08:00
parent e381c6adde
commit f45622ff17
2 changed files with 31 additions and 0 deletions
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18
components/driver/include/driver/rtc_io.h
View file

@ -224,6 +224,24 @@ esp_err_t rtc_gpio_hold_en(gpio_num_t gpio_num);
*/
esp_err_t rtc_gpio_hold_dis(gpio_num_t gpio_num);
/**
* @brief Helper function to disconnect internal circuits from an RTC IO
* This function disables input, output, pullup, pulldown, and enables
* hold feature for an RTC IO.
* Use this function if an RTC IO needs to be disconnected from internal
* circuits in deep sleep, to minimize leakage current.
*
* In particular, for ESP32-WROVER module, call
* rtc_gpio_isolate(GPIO_NUM_12) before entering deep sleep, to reduce
* deep sleep current.
*
* @param gpio_num GPIO number (e.g. GPIO_NUM_12).
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if GPIO is not an RTC IO
*/
esp_err_t rtc_gpio_isolate(gpio_num_t gpio_num);
/**
* @brief Disable force hold signal for all RTC IOs
*

13
components/driver/rtc_module.c
View file

@ -381,6 +381,19 @@ esp_err_t rtc_gpio_hold_dis(gpio_num_t gpio_num)
return ESP_OK;
}
esp_err_t rtc_gpio_isolate(gpio_num_t gpio_num)
{
if (rtc_gpio_desc[gpio_num].reg == 0) {
return ESP_ERR_INVALID_ARG;
}
rtc_gpio_pullup_dis(gpio_num);
rtc_gpio_pulldown_dis(gpio_num);
rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_DISABLED);
rtc_gpio_hold_en(gpio_num);
return ESP_OK;
}
void rtc_gpio_force_hold_dis_all()
{