https://devzone.nordicsemi.com/f/nordic-q-a/126785/nrf54l15dk-channelsounding-testHello, I would like to use the official hci_uart sample to send Channel Sounding test-related HCI commands (specifically HCI_LE_CS_TEST and HCI_LE_CS_TEST_END ) to the Nordic nRF54L15 DK. Could you please advise on the required configurations I needen-USTelligent Community 13Mon, 02 Feb 2026 09:01:03 GMThttps://devzone.nordicsemi.com/thread/560088?ContentTypeID=1Mon, 02 Feb 2026 09:01:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30dd178a-2d90-45fb-9bda-e8d633f2e666Lee1823<p>Thank you very much!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/560011?ContentTypeID=1Fri, 30 Jan 2026 13:22:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2f93c590-3888-450d-9bde-e961158efdcdSamruddhi Jadhav<p>Hello,</p> <p>1) You need to first enable Channel sounding in the controller when building hci_uart. This must be done via Kconfig:</p> <p>west build -b nrf54l15dk/nrf54l15/cpuapp --pristine -- -DCONFIG_BT_CTLR_CHANNEL_SOUNDING=y</p> <p></p> <p>2) Ensure that the CS controller options are set as needed (this is optional):</p> <p><code>BT_CTLR_CHANNEL_SOUNDING=y</code></p> <p><code>BT_CTLR_SDC_CS_COUNT</code></p> <p><code></code><code>BT_CTRL_SDC_CS_ROLE_*</code></p> <p><code>BT_CTRL_SDC_CS_STEP_MODE3</code></p> <p></p> <p><span>3) Then you can flash the hci_uart image to your DK. After building, you can program the DK via west flash</span></p> <p><span></span></p> <p><span>4) You can then send CS test HCI commands over UART:</span></p> <p><span>HCI_LE_CS_TEST</span></p> <p><span>HCI_LE_CS_TEST_END</span></p> <p><span></span></p> <p><span style="font-family:monospace;"><code><span></span></code></span></p> <p><span>I recommend you to take a look at our following documentations:&nbsp;</span></p> <p><span><a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/channel_sounding.html">LE CS doc</a> - Explains about Channel Sounding, which capabilities are supported, how its enabled with Kconfig.</span></p> <p><span><a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/channel_sounding.html#developing_with_cs">Developing with CS</a> - Lists Kconfig options for channel sounding</span></p> <p><span><a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/channel_sounding.html#testing_cs_implementation">Testing CS implementation</a> - Mentions using HCI UART sample</span></p> <p><span></span></p> <p><span>Best Regards,</span></p> <p><span>Samruddhi</span></p> <p><span></span></p> <p><code><span></span></code></p><div style="clear:both;"></div>