Unable to toggle esp32 c6 GPIO_NUM_4

[sauravkumal]

Hi, I am not sure why i am unable to toggle esp32 c6 GPIO_4. I am able to toggle GPIO_5. Same code works for esp32.

But for GPIO_4 its always low. Does this pin require special configuration? I looked throughout the documentation and didn't find such case.

Code: Untitled.c Select all

#include <stdio.h>



#include "esp_log.h"



#include "lvgl.h"

#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "driver/gpio.h"



static const char *TAG = "WATCH";

static bool state;



void app_main(void)

{

    ESP_LOGD(TAG, "Start Main");



    gpio_set_direction(GPIO_NUM_4, GPIO_MODE_OUTPUT);

    gpio_set_level(GPIO_NUM_4, 1);

    state = false;



    while (true)

    {

        if (state == true)

        {

            gpio_set_level(GPIO_NUM_4, 0);

            state = false;

            ESP_LOGD(TAG, "Motor off");

        }

        else

        {

            state = true;

            gpio_set_level(GPIO_NUM_4, 1);

            ESP_LOGD(TAG, "Motor on");

        }

        

        vTaskDelay(pdMS_TO_TICKS(1000));

    }

}

[JoeSensoric]

Which board are you using? Do you have a schematic?
Perhaps there is something connected to GPIO4 onboard.

[sauravkumal]

I am now using esp32 c6 wroom-1 dev board without connecting anything. Still not working.

[JoeSensoric]

In the datasheet GPIO4 and 5 (and others) are highlighted with reference to chapter "2.3.4 Restrictions for GPIOs and LP GPIOs".
Both GPIOs are used for SPI and are "input enabled" at boot time and after.

The non-highlighted GPIO or LP GPIO pins are recommended for use first.

This should not interfere with your program...

[skwidder]

I'm having this same issue as well as being unable to set the Pin as a UART. Did anyone find a solution to this issue?

[fasani]

I also hit this issue. In my case both C6 GPIO_NUM_4 & 5 are low or in a strange "floating state" but I cannot toggle them high...

OWN board with QFN40: https://github.com/martinberlin/H-C6-ul ... st.1.0.pdf

[arc12_esp]

I had this problem and solved it by using gpio_config()

I believe the problem is due to the default IOMUX for these "pins" being MTMS/MTDI (see section 2 in the datasheet). gpio_config() changes this to "F1".

Same effect for GPIO 6 and 7.