https://devzone.nordicsemi.com/f/nordic-q-a/14032/2-line-uart-peripheral-connectionHi. I&#39;ve got little problem with the uart connection to one peripheral. It&#39;s a normal 2-line connection without HW flow control. I&#39;m using app_uart_fifo. HW is nRF52 with sdk 11. I don&#39;t have uart tracing enabled in the package nor any other uart sourceen-USTelligent Community 13Wed, 25 May 2016 10:46:55 GMThttps://devzone.nordicsemi.com/thread/53653?ContentTypeID=1Wed, 25 May 2016 10:46:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e04c8a32-1514-48f8-976e-a50356faaff8Ole Bauck<p>Sounds strange. I don&#39;t see what could be wrong, maybe wrong SoftDevice was flashed? Anyhow, if you don&#39;t have any more problems I guess we can say that the issue is solved.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/53654?ContentTypeID=1Tue, 24 May 2016 10:23:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:af33cf37-b7f8-4e70-8a14-d54c73b9b1fcMatts<p>I think this might be related to softdevice. I re-flashed the softdevice and the UART output is OK when I view it in oscilloscope. I haven&#39;t been able to see the issue since flashing. Also before I flashed I saw correct behaviour if I didn&#39;t use the fifo.</p><div style="clear:both;"></div>