I need help getting a GPIO to work from the DTS to the code

RE: I need help getting a GPIO to work from the DTS to the code

Edvin — Wed, 15 Oct 2025 06:45:08 GMT

This looks about correct.

I don't think you need to specify CONFIG_PINCTRL=y in prj.conf, as I believe it is set by default.

Other than that, to set GPIO outputs that you want to control manually from your application, it is normal to define them as leds in your overlay/dts files, and use the API that you are using here.

An alternative is to use the buttons and leds module that is used in the nrf samples, such as the peripheral_uart sample.

You can add the CONFIG_DK_LIBRARY=y, and include:

#include <dk_buttons_and_leds.h>

and use dk_buttons_init() and dk_leds_init(), which will configure all the buttons and leds defined in your board files. Look at the sample for reference. If you dig into the dk_buttons_and_leds.c, you will see that it is set up pretty much like you already did in your application.

Best regards,

Edvin

RE: I need help getting a GPIO to work from the DTS to the code

albert_1977 — Wed, 15 Oct 2025 01:34:08 GMT

I got it working.

On the prj.conf file I have the two lines:

CONFIG_GPIO=y
CONFIG_PINCTRL=y

On the .dts file in the "boards" folder I had to add:

&gpiote {
	status = "okay";
};

&gpio0 {
	status = "okay";
};

&gpio1 {
	status = "okay";
};

The overlay file has the following:

	leds {
		compatible = "gpio-leds";

		led0: led_0{
			gpios = < &gpio0 24 GPIO_ACTIVE_HIGH>;
			label = "LED0";
		};

		led1: led_1{
			gpios = < &gpio0 16 GPIO_ACTIVE_HIGH>;
			label = "LED1";
		};
	};

    aliases{
        led0 = &led0;
    };

And finally on the C code I have:

/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS   250
static void pin_ios_task(void);

K_THREAD_DEFINE(pio_ios_tid, PIN_IOS_STACKSIZE, pin_ios_task, NULL, NULL, NULL, PIN_IOS_PRIORITY, 0, 0);

/* Identifier for GPIOs */
#define LED0_NODE           DT_ALIAS(led0)
static struct gpio_dt_spec gpio_led_0 = GPIO_DT_SPEC_GET(LED0_NODE, gpios);

LOG_MODULE_REGISTER(pin_ios);

void pin_ios_init(void)
{
	
	gpio_pin_configure_dt(&gpio_led_0, GPIO_OUTPUT_ACTIVE);

	if (!gpio_is_ready_dt(&gpio_led_0))
	{
		LOG_ERR("Error LED 0 init");
	}

	return;
}

static void pin_ios_task(void)
{
    while(1)
    {
        k_sleep(K_MSEC(SLEEP_TIME_MS));
        gpio_pin_toggle_dt(&gpio_led_0);
    }
}

I am still not sure what is actually the correct way of doing this of if I added too much information, but it was the only way to get it to compile and run.

Cheers,

Alberto

RE: I need help getting a GPIO to work from the DTS to the code

albert_1977 — Tue, 14 Oct 2025 23:39:43 GMT

Hi Edvin,

I didn't get it working yet. It was just a mistake on the original question. I'll zip up the project later today, I'll still try to get it working.

This is a custom board, but like I mentioned before, the programmer works and the microcontroller is detected. I have an LED on P0.24 that I'd like to toggle and it's something I'm struggling with the DTS currently.

Cheers,

Alberto

RE: I need help getting a GPIO to work from the DTS to the code

Edvin — Tue, 14 Oct 2025 13:37:36 GMT

[quote user="albert_1977"]

I'm sorry,

the overlay file is in the project folder, and set as overlay file in the build configuration:

[/quote]

Does that mean that you got it working? Or not?

If not, can you please zip and upload the application here, so that I can have a look? Also specify what board you are building for, please.

Best regards,

Edvin

RE: I need help getting a GPIO to work from the DTS to the code

albert_1977 — Tue, 14 Oct 2025 08:51:38 GMT

I'm sorry,

the overlay file is in the project folder, and set as overlay file in the build configuration: