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

[Ankush]

Also what is the syntax of writing to NFCPINS register. and where we need to configure it