https://devzone.nordicsemi.com/f/nordic-q-a/33810/nrf52840-usb-comHi, I have developed part of my code using UART, starting from the UART example in \examples\peripheral\uart , but before continuing I need to start doing things over USB. I have followed the instructions on the USBD_CDC_ACM example, found here ( USBen-USTelligent Community 13Mon, 30 Apr 2018 05:14:21 GMThttps://devzone.nordicsemi.com/thread/130221?ContentTypeID=1Mon, 30 Apr 2018 05:14:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f67cbb1d-03c9-4e31-8be2-2ad5b5160399adragocelestica<p>I have found what was wrong, basically I was not using the right handshake protocol in my terminal. Thank you very much for your help. <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/130040?ContentTypeID=1Thu, 26 Apr 2018 20:16:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9511fe20-d17d-434f-a6b3-1cd936b5074cKenneth<p>I suggest to take a look at&nbsp;\nRF5_SDK_15.0.0_a53641a\examples\peripheral\usbd_ble_uart</p> <p>This show how to send uart data over BLE, the counterpart is&nbsp;\nRF5_SDK_15.0.0_a53641a\examples\ble_peripheral\ble_app_uart&nbsp;</p> <p>&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/129817?ContentTypeID=1Wed, 25 Apr 2018 14:43:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:024c9410-21c9-4cbe-98c1-f7a5fdffcc09adragocelestica<p>The only thing that came to mind as to how to do it is to leave the while(true) loop in the main function as following:</p> <p><pre class="ui-code" data-mode="text">while(app_usbd_cdc_acm_read(&amp;m_app_cdc_acm, m_rx_buffer, READ_SIZE) != NRF_SUCCESS); while(app_usbd_cdc_acm_write(&amp;m_app_cdc_acm, m_rx_buffer, READ_SIZE) != NRF_SUCCESS);</pre></p> <p>I expect that to work as an echo, but it is not working at all, so i must definitely be doing something wrong.</p><div style="clear:both;"></div>