https://devzone.nordicsemi.com/f/nordic-q-a/12391/initializing-uart-for-ble-nusHi, Using ble-app-uart sdk9 example: Is there a difference where I initialize uart in main? My code is able to run when I shifted the uart_init() after ble_stack_init on my custom board , but gets stucks at softdevice initializing ble stacken-USTelligent Community 13Tue, 08 Mar 2016 11:32:31 GMThttps://devzone.nordicsemi.com/thread/46844?ContentTypeID=1Tue, 08 Mar 2016 11:32:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e64e3a31-a4ec-4cb5-821e-63271c18331cMartinBL<p>This seems very odd.</p> <ol> <li> <p>I tried the &quot;ble_peripheral\ble_app_uart&quot; example and tried to call uart_init() both before and after ble_stack_init(). I was not able to reproduce your issue.</p> </li> <li> <p>The baudrates shouldn&#39;t have anything to do with ble_nus_init() at all.</p> </li> <li> <p>UART pins should not be left floating.</p> </li> </ol> <p>Does your board have an external low frequency XTAL?</p> <p>Can you please follow RK&#39;s advice and debug and step through your code to pinpoint the errors? <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">Here is a guide on debugging</a>. The errors you describe just doesn&#39;t make sense at all so we will need some hard facts to be able to help you.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/46845?ContentTypeID=1Tue, 08 Mar 2016 01:21:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:23f0e7d0-b055-47e0-b3d1-9ba840c2d754RK<p>&quot;Stuck&quot;. Code does not &#39;stick&#39;, it&#39;s running somewhere, it&#39;s doing something. You are probably in an error handler. Put a breakpoint in the error handler or hit break in the debugger and find out where you are and what function returned what error.</p> <ol start="3"> <li>No it&#39;s not - don&#39;t connect floating pins to RTS/CTS.</li> </ol><div style="clear:both;"></div>