RE: Use NFC pin and RESET pin as inputs

Håkon Alseth — Mon, 27 May 2019 10:58:53 GMT

Hi,

In order to use the reset pin (P0.18) as an normal GPIO, you need to remove the define "CONFIG_GPIO_AS_PINRESET", and rebuild your project (clean it first, then build).

To use the NFC pins (P0.09 and P0.10), the procedure is similar, but you add the define "CONFIG_NFCT_PINS_AS_GPIOS" instead. If you are using the nRF52840-DK for this, you need to move two resistors as well, as described here:

https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_nfc_if.html?cp=3_0_4_7_10

Note: it's always recommended that you erase the flash before programming the updated firmware:

nrfjprog -e -f nrf52

nrfjprog --program <myhex> -f nrf52 --reset

Kind regards,

Håkon