Unable to control GPIOs pin in nrf7002DK

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Thu, 11 Sep 2025 16:00:41 GMT

ive put 3v3 on the VIO ref, this resolved my issue

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Thu, 11 Sep 2025 07:59:48 GMT

im using the gpios to control the driver of the motor

RE: Unable to control GPIOs pin in nrf7002DK

Vidar Berg — Thu, 11 Sep 2025 07:26:33 GMT

You should not drive a stepper motor directly from the GPIO anyway. The VBAT voltage must also be isolated from the GPIO. I recommend looking for reference circuits online that show how you can properly use the GPIO of an MCU to control the motor. Maybe there are some in the datasheet for your motor.

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Thu, 11 Sep 2025 07:14:43 GMT

actually i also need theses gpios for a step motor so I really need more voltage from the gpios.
Does gpio open drain would help ? can i use the power of vbat somehow ?

RE: Unable to control GPIOs pin in nrf7002DK

Vidar Berg — Wed, 10 Sep 2025 16:42:14 GMT

Yes, but the problem is not the drive strength but that the VDD/GPIO voltage that is only 1.8v on this board. You can check the spec. for you LEDs to find out what is needed to turn them on.

Here's the LED circuit on 7002 DK for comparison:

Ref. https://docs.nordicsemi.com/bundle/ug_nrf7002_dk/page/UG/nrf7002_DK/hw_buttons_leds.html

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Wed, 10 Sep 2025 15:25:51 GMT

indeed the problem was the voltage...
You say "standard drive strength" is there a way to enhance it ?

RE: Unable to control GPIOs pin in nrf7002DK

Vidar Berg — Tue, 09 Sep 2025 13:33:26 GMT

I don't know which LED you have, but as mentioned earlier, the IO voltage on this board is only 1.8 V. I'm not sure you'll be able to drive your LEDs with this. Do you have a voltmeter, oscilloscope, or logic analyzer you can use to measure the output instead?

EDIT: removed mention about gpio drive strength as it's not relevant here.

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Tue, 09 Sep 2025 13:19:20 GMT

I want to control a led so it cant be in input mode ?
I thought reading the toggle would make it work, the gpio is connected to the led and doesnt change so i can see that it has no effect

RE: Unable to control GPIOs pin in nrf7002DK

Turbo J — Tue, 09 Sep 2025 13:14:14 GMT

You still don't put the GPIOs into INPUT mode.

Read the PS/datasheet and check the GPIO code - the pins cannot be read back in output mode unless you do some cursed things in code.

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Tue, 09 Sep 2025 13:06:07 GMT

So i shorted the bridges, now i'm doing this :

    int ret = gpio_pin_set_dt(&red_led, 0);
    if (ret < 0) {
        LOG_ERR("Failed to set red LED: %d", ret);
    }


    gpio_pin_toggle_dt(&red_led);
    LOG_ERR("First Red led toggle: %d\n", gpio_pin_get_dt(&red_led));
    k_msleep(1000);
    gpio_pin_toggle_dt(&red_led);
    LOG_ERR("Second Red led toggle: %d\n", gpio_pin_get_dt(&red_led));
    k_msleep(1000);

And i always get 0, I dont understand

RE: Unable to control GPIOs pin in nrf7002DK

Turbo J — Tue, 09 Sep 2025 12:23:53 GMT

The SBs are on the PCB back side according to the docs.

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Tue, 09 Sep 2025 12:19:00 GMT

And also for my project i would need 10 gpios, it seems complicated no ?

RE: Unable to control GPIOs pin in nrf7002DK

Vidar Berg — Tue, 02 Sep 2025 16:51:30 GMT

I see now from the original code snippets you posted that you’re trying to read the pin. However, this will only work if you first configure the pin as an input (GPIO_INPUT). You can’t use this API to read the output state.

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Tue, 02 Sep 2025 13:43:44 GMT

Thanks for the answer ! Didnt saw that these ones needed soldering

I cannot solder it right now so I tried to use others gpios : gpio0.2 and gpio0.3, used by i2c but I disabled it like so the overlay file :

&i2c1 {
	status = "disabled";
};

But i'm also unable to control them

I also tried to control the leds 0 and 1 of the board : this works, the leds were blinking as intended but the method to read "gpio_pin_get_dt" was always printing 0, I added delay between the setting of the pin and the reading thinking it would help but no

RE: Unable to control GPIOs pin in nrf7002DK

Vidar Berg — Tue, 02 Sep 2025 11:14:52 GMT

Hello,

To use these pins you need to short the following solder bridges

(https://docs.nordicsemi.com/bundle/ug_nrf7002_dk/page/UG/nrf7002_DK/solder_bridge.html)

Please also keep in mind that the IO voltage is only 1v8 on this board, which may be too low to drive your LED.

Similar case that may be relevant: SPIM4 Configuration Issues with NRF5340dk board

RE: Unable to control GPIOs pin in nrf7002DK

azkpye — Mon, 01 Sep 2025 14:30:10 GMT

But I have a led connected to theses pins so I should see the change directly ?
I tried with other gpios that are set 1 to by default (idk how) and I see the led being lighted up but i also cant control them

RE: Unable to control GPIOs pin in nrf7002DK

Turbo J — Mon, 01 Sep 2025 14:28:33 GMT

Measure pin voltage with a multimeter.

The bit that allows pin state to be read back is usually not set when pin mode is "output".