Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/f/nordic-q-a/12440/prototype-board-with-nrf51422-crashes-on-printf-statement-in-peripheral-uart-exampleWe have made a bare minimum prototype with nrf51422 QFN chip following the reference schematic for internal LDO setup in 11.5.1 section of nrf51422_PS_v3.1. It is built on a strip board with through hole components and nRF51422 on a QFN breakout boarden-USTelligent Community 13Mon, 18 Apr 2016 07:07:41 GMTRE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47090?ContentTypeID=1Mon, 18 Apr 2016 07:07:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a5ae82e-6ccd-44bc-a35c-edbcdb4794c8Akhil<p>I have figured out the issue. That sample Uart program expects a UART reciever to be connected to the Rx pin when the code is run. Keeping the Rx pin floating throws a &#39;Uart framing error&#39;. It is possible to keep the Rx pin floating if the source code is modified to ignore the &#39;framing error&#39;.</p><div style="clear:both;"></div>RE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47089?ContentTypeID=1Thu, 17 Mar 2016 09:02:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0366fd51-9320-4ea3-ae29-ea8644b9868aMartinBL<p>Hi. Maybe you are getting some kind of UART assert and end up in the uart_error_handle. Please try to put a breakpoint in the uart_error_handle and add CFLAGS += -DDEBUG to the makefile. This might stop your application instead of resetting it.</p><div style="clear:both;"></div>RE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47088?ContentTypeID=1Wed, 16 Mar 2016 13:30:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9f57b0e-7e31-4d40-a0d8-bacbc53534b8Akhil<p>Hi Martin, I have attached the source code which we used. This was taken straight from the uart example included in the nrf SDK.</p><div style="clear:both;"></div>RE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47087?ContentTypeID=1Wed, 16 Mar 2016 08:51:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c40a5383-3110-4494-805d-359a5ef205c9MartinBL<p>What are you trying to print? Do you mind sharing your code? You can submit it confidentially on our official <a href="https://www.nordicsemi.com/eng/Support-Community/">MyPage</a> support portal if you are not comfortable doing it here. .</p><div style="clear:both;"></div>RE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47086?ContentTypeID=1Sun, 13 Mar 2016 09:00:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ca5fca5-88ee-4a33-a17a-524f10343a17Akhil<p>Hi Martin, sorry for the delay in replying. 1. Yes, I am using uart example without any modification. 2. We are using SDK 9 with SD v8. 3. I tried stepping through the code using GDB. It resets to main() when executing printf(). If I try to step inside the printf(), gdb gets confused and goes to some unknown memory location.</p><div style="clear:both;"></div>RE: Prototype Board with nRF51422 crashes on printf() statement in peripheral/Uart example.https://devzone.nordicsemi.com/thread/47085?ContentTypeID=1Thu, 10 Mar 2016 09:01:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e6e8d9ab-3315-461c-9b70-a0c0bf4ec6e8MartinBL<ul> <li>Do you use the uart example completely unchanged? Otherwise do you mind posting your code?</li> <li>Which SDK are you using?</li> <li>Have you tried <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/?answer=60126#post-id-60126">stepping through your code</a> to see if you get any asserts?</li> </ul><div style="clear:both;"></div>