configuring NFC pins and crystal oscillator pins to GPIO

[Ankush]

Hi all,

I am using pins P0.00, p0.01, p0.09 and p0.10 in my application. I wandering why these pins are not functioning as GPIO. I have searched various links such as

1 and 2

but still the confusion remains the same. Links says I have to add

const uint32_t UICR_ADDR_0x20C    __attribute__((at(0x1000120C))) __attribute__((used)) = 0xFFFFFFFE

line in the code. But when I am adding it in main.c code I am getting error.

Can anyone help me to resolve this issue? I am using SDK12.0.0. Is there any simple methos available in this SDK

[Jørgen Holmefjord]

P0.00 and P0.01 should work as GPIO without any changes, as long as you have not configured the LFCLK source to be crystal oscillator, or have connected a crystal to these pins. Are you using the nRF52 DK board, or some other custom board?