Sending HCI commands to nRF52840 via UARThttps://devzone.nordicsemi.com/f/nordic-q-a/64612/sending-hci-commands-to-nrf52840-via-uartHi All, I need to send HCI commands from my uC to nRF52840 (with DTM firmware) via UART to for example set channel, Tx power, packet type etc. Are there any examples/documentation that I could use as my starting point? Thank you HNen-USTelligent Community 13Fri, 07 Aug 2020 23:46:27 GMTRE: Sending HCI commands to nRF52840 via UARThttps://devzone.nordicsemi.com/thread/263697?ContentTypeID=1Fri, 07 Aug 2020 23:46:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26e24d0f-4641-462a-9a2d-ee78baed72cdWavecake<p>Do you know if it&rsquo;s a true Bluetooth HCI spec? If it is Bluetooth HCI, you could look up the spec on bluetooth.com </p> <p>if it a custom HCI for this particular firmware, you&rsquo;re right, that documentation would have to come from Nordic.</p><div style="clear:both;"></div>RE: Sending HCI commands to nRF52840 via UARThttps://devzone.nordicsemi.com/thread/263696?ContentTypeID=1Fri, 07 Aug 2020 23:14:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:923f2a64-4e90-4a6d-b313-0f3414c99271Houman<p>Thanks for your reply Jackson but I need to know what bit patterns to send to UART since I can&#39;t use the BLE Libraries when using a uC.</p><div style="clear:both;"></div>RE: Sending HCI commands to nRF52840 via UARThttps://devzone.nordicsemi.com/thread/263690?ContentTypeID=1Fri, 07 Aug 2020 19:16:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d550b67-d374-4bee-ab2a-5cedbe85ae99Wavecake<p>I found <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fble_sdk_app_dtm_serial.html&amp;cp=4_0_0_4_3">this</a> product spec entry elsewhere in the forum. Maybe it might be helpful?</p> <p></p><div style="clear:both;"></div>