Hold state of GIPIO LOW during deep sleep mode

[andrelmbraga]

Hello guys,
I have a project with ESP32 WROOM in my own pcb board where I control one transistor to connect the ground my device sensors when my ESP32 is wake and when it goes to sleep it must have a GPIO in low lvl in order to put the transistor in cut mode.

The problem that I figured out is that the GPIO's are floating instead of stay in low mode during the sleep mode.

First I was trying to do this in arduino IDE, that can be the best option for me as my project was original made over there. However I didnt find any function to make the GPIO keep the same state during the deep sleep.

Looking in ESP-IDF i found these function:
gpio_deep_sleep_hold_en();
gpio_hold_en(gpio_num_t BLINK_GPIO);

I understood that they were made for this keep the gpio in previous state during the deep sleep, however i have tried without success.

Following the code so you can easily reproduce this issue:

Code to reproduce this issue

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "esp_sleep.h"
#include "driver/gpio.h"
#include "sdkconfig.h"

#define BLINK_GPIO 25

void app_main()
{
    printf("Hello world!\n");
	gpio_pad_select_gpio(BLINK_GPIO);
	gpio_set_direction(BLINK_GPIO, GPIO_MODE_OUTPUT);

        /* Blink off (output low) */
	printf("Turning off the LED\n");
        gpio_set_level(BLINK_GPIO, 0);
        vTaskDelay(2000 / portTICK_PERIOD_MS);
        /* Blink on (output high) */
	printf("Turning on the LED\n");
        gpio_set_level(BLINK_GPIO, 1);
        vTaskDelay(2000 / portTICK_PERIOD_MS);
  
  
    printf("Restarting now.\n");
	fflush(stdout);
	gpio_deep_sleep_hold_en();
	gpio_hold_en(gpio_num_t BLINK_GPIO);
	esp_sleep_enable_timer_wakeup(10000000);
	esp_deep_sleep_start();

   

}

Therefore, I would like your help to understand why this is not working and if is possible to make it in arduino IDE.

Thanks in advance!!!

[lbernstone]

You might need to enable the power on the rtc gpios. https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/system/sleep_modes.html#power-down-of-rtc-peripherals-and-memories

[andrelmbraga]

I make it works in esp idf using
gpio_hold_en(BLINK_GPIO);
gpio_deep_sleep_hold_en();

however i really would like to do that in arduino IDE. Does anyone has a clue?

[me-no-dev]

the code above will not run in Arduino. what code are you running in Arduino?

[andrelmbraga]

Actually I'm running a much bigger code in arduino, I ll put here something that you can reproduce the problem.

TC_DATA_ATTR int bootCount = 0;
#define uS_TO_S_FACTOR 1000000  /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP  10       /* Time ESP32 will go to sleep (in seconds) */



void setup(){
  Serial.begin(115200);
  delay(1000); //Take some time to open up the Serial Monitor

  //Increment boot number and print it every reboot
  ++bootCount;
  Serial.println("Boot number: " + String(bootCount));
  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  Serial.println("Going HIGH");
  pinMode(GPIO_NUM_25,OUTPUT);
  digitalWrite(GPIO_NUM_25, HIGH);
  delay(2000);
  Serial.println("Going LOW");
  digitalWrite(GPIO_NUM_25, LOW);
  delay(2000);
  Serial.println("Going to sleep now");
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
}

void loop(){
  //This is not going to be called
}

In this code you can see that the gpio 25 ll be floating in sleep mode, and I want it fix on low level.

[me-no-dev]

why not add the missing

gpio_hold_en(GPIO_NUM_25);
gpio_deep_sleep_hold_en();

[andrelmbraga]

I can use gpio_hold_en() declaring my pin like this #define PIN_LORA GPIO_NUM_25
However the 'gpio_deep_sleep_hold_en' doesnt work, I dont know if there is such thing in arduino IDE.

The error is:

exit status 1
'gpio_deep_sleep_hold_en' was not declared in this scope

[me-no-dev]

you are probably missing an include...

#include "esp_sleep.h"

[andrelmbraga]

I try to include this lib, but still doesn't works.

I found this function gpio_deep_sleep_hold_en at:

https://github.com/espressif/arduino-esp32/blob/master/tools/sdk/include/driver/driver/gpio.h

I'm not sure if I can use all these functions on arduino IDE, also I tried to #include "driver/gpio.h"
But still it give me this msg:

exit status 1
'gpio_deep_sleep_hold_dis' was not declared in this scope

This gpio.h can be used at arduino IDE or is just for esp-idf?

Please help me this is hold me for more than 2 weeks =/.

Following the code to reproduce the issue :

`#include "esp_sleep.h"
#include "driver/gpio.h"
#include "esp_err.h"

RTC_DATA_ATTR int bootCount = 0;
#define uS_TO_S_FACTOR 1000000  /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP  10       /* Time ESP32 will go to sleep (in seconds) */

#define PIN_LORA GPIO_NUM_25

void setup(){
  Serial.begin(115200);
  delay(1000); //Take some time to open up the Serial Monitor

  //Increment boot number and print it every reboot
  ++bootCount;
  Serial.println("Boot number: " + String(bootCount));
  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  Serial.println("Going HIGH");
  pinMode(GPIO_NUM_25,OUTPUT);
  digitalWrite(GPIO_NUM_25, HIGH);
  delay(2000);
  Serial.println("Going LOW");
  digitalWrite(GPIO_NUM_25, LOW);
  delay(2000);
  Serial.println("Going to sleep now");
  gpio_hold_en(GPIO_NUM_25);
  gpio_deep_sleep_hold_en();
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
}

void loop(){
  //This is not going to be called
}

[lbernstone]

The code in your last post compiles for me. The functions in the headers at tools/sdk/include should all be compiled into the esp-idf libraries that are available to arduino-esp32. So, you should be able to use the exact same code snippets in arduino as in esp-idf. What version of arduino-esp32 are you using? You might want to update or uninstall/reinstall to ensure your files are not damaged.

[rene6262]

Hi, i have the same issues where 'gpio_deep_sleep_hold_en' was not declared in this scope and the eps32 has its libraries updated. @lbernstone did you compile it on arduino ide or another software?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This stale issue has been automatically closed. Thank you for your contributions.