https://devzone.nordicsemi.com/f/nordic-q-a/48414/zephyr-s-hci_uart-works-well-only-after-starting-jlinkrttloggerHi all, Our custom board has 2 MCUs connected each other via UART to implement 2-chip configuration. One is the main MCU which has Cortex R4 and the other is nRF52810. All of them runs Zephyr respectively. CR4(CortexR4) runs Zephyr&#39;s iBeaconen-USTelligent Community 13Tue, 03 Sep 2019 08:41:33 GMThttps://devzone.nordicsemi.com/thread/207596?ContentTypeID=1Tue, 03 Sep 2019 08:41:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6923fdc8-821c-47ae-b750-c94c9f821cc3bhstalel<p><span class="user-name"><a class="internal-link view-user-profile" href="https://devzone.nordicsemi.com/members/youngdo-lee">Youngdo Lee</a>&nbsp;, Can you give me the hex hci_uart example for nRF52832 ? I&#39;m unable to compile it ,&nbsp;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/192188?ContentTypeID=1Wed, 12 Jun 2019 02:20:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d8c195b8-a9dd-46b1-99b6-772300e6eb3cYoungdo Lee<p>Self answer:</p> <p></p> <p>The problem was a configuration issue.</p> <p></p> <p>I used the default configuration which enables DCDC by default.(samples/bluetooth/hci_uart/nrf5.conf)</p> <p>But our&nbsp;H/W doesn&#39;t have external LC filters connected to DCC, so we shouldn&#39;t enable DCDC.</p> <p></p> <p>Adding&nbsp;CONFIG_BOARD_ENABLE_DCDC=n to nrf5.conf solved the problem.</p> <p></p> <p>Thanks anyway.</p><div style="clear:both;"></div>