https://devzone.nordicsemi.com/f/nordic-q-a/38559/does-mbed-fully-support-the-nrf52840-dk-yetThe reason I ask if that its compiler recognizes the P0.xx pins, but apparently not the P1.xx pins. For example, it throws the error message: Error: Identifier &quot;P1_00&quot; is undefined in &quot;main.cpp&quot;, Line: 9, Col: 12 for this line of code: Serial pcen-USTelligent Community 13Mon, 17 Sep 2018 11:53:26 GMThttps://devzone.nordicsemi.com/thread/149015?ContentTypeID=1Mon, 17 Sep 2018 11:53:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f9f4cf0f-4177-4f4e-95c3-f425d54e021fEinar Thorsrud<p>Hi,</p> <p>There is some support for the <a href="https://os.mbed.com/platforms/Nordic-nRF52840-DK/">nRF52840 DK in mbed</a>, but I don&#39;t know how mature it is. I recommend you ask in the <a href="https://os.mbed.com/forum/">mbed forums</a> instead as the mbed port is done by ARM and not by Nordic.</p><div style="clear:both;"></div>