nRF52840 custom board zephyr select LF source RChttps://devzone.nordicsemi.com/f/nordic-q-a/73640/nrf52840-custom-board-zephyr-select-lf-source-rcHi. I need some help to select the source for LF clock. I&#39;m using NRF Connect SDK v1.5.0 SEGGER Embedded Studio for ARM Release 5.34a Build 2021011401.44914 Nordic Edition macOS x64 High Sierra v10.13.6 I build my own custom board with a nRF52840en-USTelligent Community 13Wed, 07 Apr 2021 13:10:01 GMTRE: nRF52840 custom board zephyr select LF source RChttps://devzone.nordicsemi.com/thread/303535?ContentTypeID=1Wed, 07 Apr 2021 13:10:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f81a8f90-5bde-4885-920a-fa02caa5a254Wagner Caetano<p>It works!!!<br />Thanks.</p><div style="clear:both;"></div>RE: nRF52840 custom board zephyr select LF source RChttps://devzone.nordicsemi.com/thread/303444?ContentTypeID=1Wed, 07 Apr 2021 10:51:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1a01fc00-d339-4cc5-8bc8-fdf82b7f5c84Simon<p>Try setting these in the prj.conf file:</p> <p><pre class="ui-code" data-mode="text">CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n</pre></p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>