Enable pins 9 and 10 as GPIO on NRF52

[jeremysmorgan]

Hi All,

I am developing a ble applications and am unable to get pins 9 or 10 to work as gpio. I understand that this is because, by default they are used by the NFC.

I have tried the following solutions:

1) defining the CONFIG_NFCT_PINS_AS_GPIOS variable in the project settings. (infocenter.nordicsemi.com/index.jsp

and 2) Adding const uint32_t UICR_ADDR_0x20C __attribute__((at(0x1000120C))) __attribute__((used)) = 0xFFFFFFFE; to uicr_config.h and setting "Use Memory Layout from Target Dialog" in the project Linker options (devzone.nordicsemi.com/.../)

Unfortunately neither of these solutions worked.

Are there any other viable solutions? What else can I try?

Thanks

i'm using keil and a nrf52 development board

[endnode]

Hi Jeremy,

SW part will help you to switch GPIO vs. NFC setting in nRF52 registers but on nRF52 DK there are HW elements to tune 13.56MHz antenna interface so you need to modify solder-bridges to make it really available for external GPIO. See nRF52 DK guide.

Btw. this was answered like 10 times in past 18 months... (see e.g. here).

Cheers Jan