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esp_sleep_enable_ext1_wakeup_io() function
Enable ext1 wakeup pins with IO masks. This will append selected IOs to the wakeup IOs, it will not reset previously enabled IOs. To reset specific previously enabled IOs, call esp_sleep_disable_ext1_wakeup_io with the io_mask. To reset all the enabled IOs, call esp_sleep_disable_ext1_wakeup_io(0). This function uses external wakeup feature of RTC controller. It will work even if RTC peripherals are shut down during sleep. This feature can monitor any number of pins which are in RTC IOs. Once selected pins go into the state given by level_mode argument, the chip will be woken up.
Syntax
esp_err_t esp_sleep_enable_ext1_wakeup_io(uint64_t io_mask,
esp_sleep_ext1_wakeup_mode_t level_mode);
Implemented in ![]()
sleep_modes.c:1868
Return value
- ESP_OK on success - ESP_ERR_INVALID_ARG if any of the selected GPIOs is not an RTC GPIO, or mode is invalid - ESP_ERR_NOT_ALLOWED when wakeup level will become different between ext1 IOs if !SOC_PM_SUPPORT_EXT1_WAKEUP_MODE_PER_PIN
Notes
This function does not modify pin configuration. The pins are configured in esp_deep_sleep_start/esp_light_sleep_start, immediately before entering sleep mode. Internal pullups and pulldowns don't work when RTC peripherals are shut down. In this case, external resistors need to be added. Alternatively, RTC peripherals (and pullups/pulldowns) may be kept enabled using esp_sleep_pd_config function. If we turn off the ``RTC_PERIPH`` domain or certain chips lack the ``RTC_PERIPH`` domain, we will use the HOLD feature to maintain the pull-up and pull-down on the pins during sleep. HOLD feature will be acted on the pin internally before the system entering sleep, and this can further reduce power consumption.