https://devzone.nordicsemi.com/f/nordic-q-a/37401/qusetion-about-hci_uart-of-zephyr-running-on-the-nrf52832I have filed an issue related to HCI UART sample from zephyr running on nrf52832. I compiled the hci_uart sample successfully, but I am not able to use the UART interface through an external USB-UART converter (CP2102 ). I btattach the dev/ttyUSBx anden-USTelligent Community 13Mon, 13 Aug 2018 07:59:52 GMThttps://devzone.nordicsemi.com/thread/143857?ContentTypeID=1Mon, 13 Aug 2018 07:59:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b546920d-db28-473d-9149-2e034765db2dhaakonsh<p>The first thing I would do is to&nbsp;verify the UART communication with a digital analyzer.&nbsp;After verifying the the USBtoUART device drives the IO lines according to spec I would run the SDK15\examples\peripheral\uart example in order to verify that the nRF does in fact receive the data correctly. Then I would compare the UART settings from the peripheral\uart example with what is used in the zephyr hci_uart example. <br />Lastly I would set a breakpoint in whatever event handler that is called when UART communication is received, verify that the data received is correct, and if not, read the register of the UART peripheral and compare it to the peripheral/uart example.&nbsp;</p><div style="clear:both;"></div>