CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Kelso — Fri, 04 Jul 2025 03:00:16 GMT

Found something important not covered in any of the tickets I've seen on this:

1. CONFIG_NFCT_PINS_AS_GPIOS=y is required

2. Power cycling the board (as opposed to simply resetting it after a firmware update) was necessary to change the NFC pin state.

It's not clear to me if there's a different route to making the NFC peripheral transition modes without requiring a power cycle, but this was sufficient to correct the issue.

To Nico7's question, SYS_INIT is a macro from include/zephyr/init.h that allows initialization code to run before main. It's important to know where it's being used in modules since an error in a SYS_INIT registered function can be hard to debug otherwise.

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

cjh39 — Fri, 28 Mar 2025 17:32:03 GMT

Im using a nrf52840 , Segger with the nrf SDK.

How do I use the NFC pins as GPIO ? There must be a simple solution to this.

Ive added #define CONFIG_NFCT_PINS_AS_GPIOS 1 to the sdk_config.h and also I added the CONFIG_NFCT_PINS_AS_GPIOS here

When I check the nrfjprog --memrd 0x10001000 --n 512, Im getting all F's

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Nico7 — Sat, 11 May 2024 08:24:36 GMT

I'm not sure where SYS_INIT is. Could you please say how you solved this?

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Brett_G — Fri, 15 Dec 2023 20:02:14 GMT

I just ran into a similar issue, where simple GPIO toggling of the NFC P0.03 was not working despite having CONFIG_NFCT_PINS_AS_GPIOS=y and seeing it being properly implemented in the UICR registers.

After a bit of debugging I found that the initialization of the GPIO was occurring within a SYS_INIT call, and calling the initialization function from main instead, would allow it to work fine.

Other non-nfc gpios called within that SYS_INIT worked fine, so it seems to only conflict with the NFC gpio configuration for some reason.

Hopefully this helps

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Vidar Berg — Tue, 12 Dec 2023 10:26:44 GMT

Please open a new ticket and include information about your setup, such as whether you are using a Nordic development kit or a custom board, what chip variant, and describe how you are attempting to configure the pin.

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

creative.industry.ag — Tue, 12 Dec 2023 08:59:15 GMT

Hello
I have the same issue.
Does anybody solve this problem?

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Vidar Berg — Tue, 05 Sep 2023 11:10:25 GMT

Please open a new ticket and include information about your setup (e.g. if you are using a nordic dev kit, or a custom board,..) and how you are trying to configure the pin.

Your UICR register readout confirms that the CONFIG_NFCT_PINS_AS_GPIOS=y setting was applied correctly, so that is not the problem in your case.

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Surendra Amina — Tue, 05 Sep 2023 10:51:41 GMT

Hi Vidar,

I am seeing the same issue on nrf5340. I cant use PIN 0.02 as GPIO.
$ nrfjprog --memrd 0xff8028
0x00FF8028: FFFFFFFE

I have also set CONFIG_NFCT_PINS_AS_GPIOS=y

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Vidar Berg — Mon, 05 Dec 2022 14:28:43 GMT

Hi Rohan,

Please read the NFCPINS register value with your debugger to see if it has been configured or not.

With nrfjprog:

$ nrfjprog --memrd 0xff8028

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

rdey — Mon, 05 Dec 2022 12:23:21 GMT

Hi Vidar,

I am also having the same problem. I have set CONFIG_NFCT_PINS_AS_GPIOS=y and building the code for secure domain (nrf5340_cpuapp) for my custom board with nrf5340.

I found that the if statement on line 180 fails https://github.com/zephyrproject-rtos/hal_nordic/blob/master/nrfx/mdk/system_nrf5340_application.c#L180

What am I missing?

I am trying to use the P0.03 pin as an input pin. Detail of my issue can be found here

Thanks,

Rohan

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

HFrg — Sat, 26 Nov 2022 14:08:28 GMT

Thank you, that was the problem.

RE: CONFIG_NFCT_PINS_AS_GPIOS=y doesn't work

Vidar Berg — Thu, 24 Nov 2022 08:29:30 GMT

Hi,

Are you building the app for the non-secure domain? In that case, you will need to apply CONFIG_NFCT_PINS_AS_GPIOS=y to the image which runs in the secure domain instead. The reason for this is that the UICR register is only accessible from the secure domain.

Here is the startup file where the UICR register gets written: https://github.com/zephyrproject-rtos/hal_nordic/blob/master/nrfx/mdk/system_nrf5340_application.c#L178. Notice the if statement at line ~74 which checks if the code is run in secure domain or not.

Best regards,

Vidar