https://devzone.nordicsemi.com/f/nordic-q-a/78273/problem-during-run-libuarte-exampleHi, dear Nordic &amp; all： When I run libuarte example，I found a problem， I just set P0.14 to high at the begin of mian function, then I send data and test the example&#39;s function by serial port（tx pin is 6， rx pin is 8）, I found P0.14 have been changeden-USTelligent Community 13Fri, 06 Aug 2021 12:23:51 GMThttps://devzone.nordicsemi.com/thread/323735?ContentTypeID=1Fri, 06 Aug 2021 12:23:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:21a8dc27-3d97-4ca0-8c4f-fda3c5487664Sigurd Hellesvik<p>Hi Chris</p> <p>Sorry, I forgot that the function is zero indexed.</p> <p>The function that toggles LED_2 is</p> <p><pre class="ui-code" data-mode="text">bsp_board_led_invert(1);</pre></p> <p>on line 99.</p> <p>Regards,<br />Sigurd</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/323686?ContentTypeID=1Fri, 06 Aug 2021 09:55:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3511a911-817a-48a8-bbd4-d0307dc5e711Chris_<p>Hi, Sigurd;</p> <p>I get your point, but when I close(<span>shield</span>)&nbsp;<span>this line and test again , It still reproduced.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/323664?ContentTypeID=1Fri, 06 Aug 2021 08:37:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cda9c33f-0227-454f-addc-46843e62f4ecSigurd Hellesvik<p>Hi Chris</p> <p>Pin 14 maps to LED_2:<br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1628238946727v1.png" alt=" " /></p> <p>Line 114 in main.c has:</p> <p><pre class="ui-code" data-mode="text">bsp_board_led_invert(2);</pre></p> <p>Which will toggle P0.14.</p> <p>Regards,<br />Sigurd</p><div style="clear:both;"></div>