NRF5340DK unable to control few GPIOs

RE: NRF5340DK unable to control few GPIOs

Kazi Afroza Sultana — Fri, 29 Aug 2025 11:22:43 GMT

Hello,

Yes. Overlays you add to your application take precedence and can overwrite the board’s default pin settings, provided they are applied later in the overlay resolution order.

You can read the following devacademy link

https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/lessons/lesson-2-reading-buttons-and-controlling-leds/

to learn how devicetree works.

RE: NRF5340DK unable to control few GPIOs

Surya Thanush — Mon, 18 Aug 2025 17:26:05 GMT

Hi Turbo,

thanks for the suggestion.

i'm new to NRF SDK, so asking this,

will creating a new/extra overlay for the project overwrite the default pin configurations present in NRF5340DK default Overlay ?

RE: NRF5340DK unable to control few GPIOs

Turbo J — Mon, 18 Aug 2025 17:14:18 GMT

You make a device tree overlay file for your project. There you can change how peripherials and pins are assigned.

RE: NRF5340DK unable to control few GPIOs

Surya Thanush — Mon, 18 Aug 2025 16:50:12 GMT

Hi Kazi Afroza sultana,

thanks for clarifying,

so as per the NRF5340DK schematics, the following pins are use as below,
P0.28 : on board LED
P0.22 : UART_2_RxD
P0.18 : Ext. Memory CS
P0.14 : Ext. Memory SIO_1/SO
P0.13 : Ext. Memory SIO_0/SI
P0.15 : Ext. Memory SIO_2/WP
P0.16 : Ext. Memory SIO_3/HOLD
P0.17 : Ext. Memory SCLK

so, makes sense that P0.28 is only working/Toggling as expected because other pins defined are used for other purposes.

So we would like to know the below,
How to disable them from the default options and make them available for GPIO actions ?

Regards
Surya Thanush

RE: NRF5340DK unable to control few GPIOs

Kazi Afroza Sultana — Mon, 18 Aug 2025 05:34:24 GMT

Hello Surya,

The reasons of seeing ''only P0.28 is toggling as expected
P0.22 is always high and all other Pins are just low all the time'' is related to the pins you assigned. P0.15, P0.16, P0.17 are used as external flash.