https://devzone.nordicsemi.com/f/nordic-q-a/23181/nfc-pins-as-output-pins-do-not-output-on-flash-but-do-on-hw-resetHI, the solution I&#39;m working on requires quite a few IO pins, so once I ran out of regular GPIO pins I had to resort to using NFC ones. I changed the UICR registers and rebooted the device to make sure the NFC pins are instead treated as GPIOs.en-USTelligent Community 13Tue, 04 Jul 2017 07:17:11 GMThttps://devzone.nordicsemi.com/thread/91186?ContentTypeID=1Tue, 04 Jul 2017 07:17:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d891857-dd09-4354-9b30-dff57b4c6f7dBoris Matešin<p>Thank you, that was at least part of the solution. The other problem was that GPIOTE does not allow configuration of output pins with a pulldown, whereas GPIO still does, and switching that particular pin to GPIO solved the issue. I&#39;m not sure whether this feature is something Nordic should care to propagate to the GPIOTE, but it sounds as if they should.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91184?ContentTypeID=1Mon, 03 Jul 2017 10:07:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:779018a8-5af3-4324-b3e3-4c095f223c67Boris Matešin<p>Thanks, that file contains the CONFIG_NFC_PING_AS_GPIOS mentioned above which may be just what I need. I&#39;ll try to insert it into the build process and see if it works.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91185?ContentTypeID=1Sun, 02 Jul 2017 10:53:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2eced448-7066-456a-8add-4234cca8e2fcJ&#248;rgen Holmefjord<p>You can define <code>CONFIG_NFCT_PINS_AS_GPIOS</code> in your C\C++ preprocessor symbols to configure NFC pins for GPIO usage.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91183?ContentTypeID=1Fri, 30 Jun 2017 19:24:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02eae6cf-ac27-4358-a4b3-2efa4a2cb744Nguyen Hoan Hoang<p>By the default the system_nrf52.c initializes the pins as NFC. You need to change it too.</p><div style="clear:both;"></div>