ESP32 Forum

ESP_igrr wrote: ↑

Wed Nov 14, 2018 7:56 am

This is a regression in recent ESP-IDF versions; we are working on a fix, but for now you can call adc_power_off function before entering deep sleep to reduce the current.

ESP_igrr wrote: ↑

Fri Nov 16, 2018 3:36 am

The issue is present in IDF 3.1.1 and 3.0.x versions as well; there likely exists a version on 3.0 branch which does not have the issue, but i can't say for sure which one is that.

Regarding adc_power_off not having effect, here's the code i used to test.
If I remove the adc_power_off line, then current is 1.4mA. If i add it back, current is 5.5uA.
Please check with this code sample to see if your issue is the same or not.

Code: Select all

#include "freertos/FreeRTOS.h"

#include "esp_wifi.h"

#include "esp_event_loop.h"

#include "nvs_flash.h"

#include "esp_sleep.h"

#include "driver/adc.h"



static void wifi_start_stop(void)

{

    ESP_ERROR_CHECK(nvs_flash_init());

    tcpip_adapter_init();

    ESP_ERROR_CHECK(esp_event_loop_init(NULL, NULL));



    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();

    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));

    ESP_ERROR_CHECK(esp_wifi_start());

    vTaskDelay(pdMS_TO_TICKS(1000));

    ESP_ERROR_CHECK(esp_wifi_stop());

    ESP_ERROR_CHECK(esp_wifi_deinit());

}



void app_main()

{

    wifi_start_stop();



    /* The following line is necessary to reproduce the issue;

     * An alternative way is to enable ext0 wakeup.

     */

    esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);



    /* powering down ADC before entering sleep works around the issue */

    adc_power_off();



    esp_deep_sleep_start();

}