https://devzone.nordicsemi.com/f/nordic-q-a/14904/uart-never-gets-tx_done_event-in-sdk-11I have an application programed on the nRF 52DK (PCA10040). Its a UART communication to a distance sensor. The Problem is, that I cant send anything from the uC to the Sensor. With the debugger I see that it will never get into tx_done_event. So theen-USTelligent Community 13Mon, 11 Jul 2016 13:13:09 GMThttps://devzone.nordicsemi.com/thread/56887?ContentTypeID=1Mon, 11 Jul 2016 13:13:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:29d4fc1f-54f6-4ddc-930a-99f19e9fbdafInspectron<p>Problem solved! Thank you so much! Had to cut the solder bridges</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56886?ContentTypeID=1Mon, 11 Jul 2016 13:07:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:648f35c6-6b5e-471d-813c-f03c4dec7061&#216;yvind Karlsen<p>Thaaat is probably a better idea =P</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56885?ContentTypeID=1Mon, 11 Jul 2016 13:07:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a7f95e10-26d3-4571-90d6-5698a7156e69RK<p>or how about just using two different GPIOs for the UART and not having to mess around with the board?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56893?ContentTypeID=1Mon, 11 Jul 2016 13:05:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4926354f-f802-4f0a-bf21-d7e29dd8c25f&#216;yvind Karlsen<p>Otherwise it would be coupled parallel to the interface MCU, I think this will cause issues. Try cutting the solder bridges (you can always resolder them afterwards) and report back.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56884?ContentTypeID=1Mon, 11 Jul 2016 13:03:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8bc4ed8-0cc4-4b14-9ad6-876ea6284ca6Inspectron<p>No. Is this necessary?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56883?ContentTypeID=1Mon, 11 Jul 2016 13:01:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9230e9a4-d862-46e0-bd05-71daf1f96b63&#216;yvind Karlsen<p>Have you cut the lines to the interface MCU? SB22-SB24</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56882?ContentTypeID=1Mon, 11 Jul 2016 13:00:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff1f7626-c0f9-45a3-8949-b4ecfeb55b4eInspectron<p>Of course. Its all default. I just changed the baudrate</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56890?ContentTypeID=1Mon, 11 Jul 2016 12:53:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6450f2a4-9b07-45cf-9103-e0aa0d13fda6&#216;yvind Karlsen<p>Could you provide some code?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56889?ContentTypeID=1Mon, 11 Jul 2016 12:50:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:84f0c699-9885-4a80-9cc3-eb1dff191ab5Inspectron<p>No. Its just a simple Uart connection between the chip and the distance sensor. Baudrate is 19200, HWFC is disabled and parity is excluded</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56888?ContentTypeID=1Mon, 11 Jul 2016 12:46:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8b19ea11-461b-401e-b988-3b1e022a4042&#216;yvind Karlsen<p>The nRF52 does not support two simultaneous UART interfaces, are you trying to connect to two at the same time?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56892?ContentTypeID=1Fri, 08 Jul 2016 08:42:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de938fa7-822e-47ee-a5c9-bb8140c96faaInspectron<p>CTS and RTS are not connected. Do I have to use RTS and CTS? How I can activate the UART when RTS and CTS are not connected?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/56891?ContentTypeID=1Sat, 02 Jul 2016 10:21:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b40c1d6a-3b85-4347-b01c-6cfdd025fccfRK<p>Try the manual which says about the virtual com port</p> <pre><code>Important: The terminal software used must send a DTR signal in order to configure the UART Interface MCU pins. </code></pre> <p>So until the first terminal connection, the UART is inactive, I assume that CTS and RTS are low and it won&#39;t do anything.</p><div style="clear:both;"></div>