CONFIGURE FOR NRESET P0.18 TO GPIO I/O

[Duong Nguyen]

Hi everyone,

I have a custom board in nrf52833. Currently, the gpios on nrf52833 are gone, except for the NReset pin (P0.18).
Can I configure the NReset GPIO as a GPIO I/O to use for my function?

file .dts:

&uicr {
	gpio-as-nreset;
};

I tried to configure:
CONFIG_GPIO_AS_PINRESET=n, but it doesn't work.



Please help me solution,

Thanks,

[Hieu]

Hi Duong,

If I think you misunderstood the DTS property gpio-as-nreset. You will want to not set it in this case.

If it is set in another file, and you need to overlay it away, you can use /delete-property/ as shown here:  Use RESET pin as GPIO - nRF52840 

Hieu

[Duong Nguyen]

Hi Hieu,

I added:
&uicr {
/delete-property/ gpio-as-nreset;
};

in the overlay file and tested with DK, but it doesn't work.

[Hieu]

Hi Duong,

Does it work on your custom board though?

If I understand your screenshot correctly, you are trying to show that the reset button still works. However, on a DK, the reset button triggers the interface MCU/debugger to send a reset command over the debug interface, not pull on the reset pin directly.

If you want to use P0.18 on the DK, you can refer to the answer in the DevZone thread linked below. It is on the nRF52840 DK, but the necessary preparations are the same.
[GPIO] Toggling of GPIO pin (HIGH, LOW)