How to config NFC as gpio on nrf54l15?

[panypan]

Hello!

I've just come into contact with the nrf54l15. On the customer's board, it is necessary to change the NFC pin to a regular gpio, and they following the previous nrf52/53 method to add CONFIG_NFCT_PINS_AS_GPIOS=y in prj.conf but it has no effect. Is there any way to achieve it? thank you!

Regards,

Pany

[Priyanka]

Hi,

For nRF54L15, you need to Disable the NFC use using the PADCONFIG register.

PADCONFIG.ENABLE=Disabled

You ca find more details regarding the same, in the Product Specification of the nRF54L15.

-Priyanka

[panypan]

Hi Priyanka,

Thank you for your reply! I solved this problem that assign values to the register " NRF_NFCT->PADCONFIG = 0" .

Pany

[GoodOld]

Hi 

I just faced the same issue, and I was trying to disable NFC in the devicetree.

&nfct {

    status = "disabled";

};

Is this "work in progress" ? - I think accessing the HW regs directly is an ugly solution ;-) 

[hanks.liu]

hello，I have tried to disable NFC in the devicetree.

&nfct {

    status = "disabled";

};
but,the PADCONFIG register is still 1。Do you have any other methods to set  the PADCONFIG register is 0?

[panypan]

Hi,

You can add the following configuration in the overlay.

&uicr {

      nfct-pins-as-gpios;

};

[Evluma]

I have had this issue as well and the above solution does not work for Trust Zone projects.

looking in nrf54l_05_10_15.dtsi

#ifdef USE_NON_SECURE_ADDRESS_MAP

        /* intentionally empty because UICR is hardware fixed to Secure */

#else

        uicr: uicr@ffd000 {

            compatible = "nordic,nrf-uicr";

            reg = <0xffd000 0x1000>;

        };

#endif

So for the non-secure builds:

&uicr {

      nfct-pins-as-gpios;

};

or

CONFIG_NFCT_PINS_AS_GPIOS=y

Does not work.

In the case of non-secure and also secure, adding the following line will fix the issue in both cases:

NRF_NFCT->PADCONFIG = 0;