https://devzone.nordicsemi.com/f/nordic-q-a/13768/freertos-debuggingHi, I am trying to debug my code in Eclipse using J-Link. Whenever the code executes vPortStartFirstTask() in vTaskStartScheduler() the debugger stops and I can&#39;t debug my program. It happens when this code is executed: __asm volatile( &quot; ldren-USTelligent Community 13Wed, 18 May 2016 10:27:12 GMThttps://devzone.nordicsemi.com/thread/52617?ContentTypeID=1Wed, 18 May 2016 10:27:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce17ca6f-aa28-47f1-b85a-b665527caa6bmitchellw<p>Thank you, you are totally right!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52616?ContentTypeID=1Wed, 11 May 2016 16:03:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:19de69ba-c5ed-48f7-868a-07f4769a5575www.FreeRTOS.org<p>The SVC handler (the function that executes when &quot;svc 0&quot; is executed) starts the scheduler, so it is not necessarily this function that is causing the problem, but maybe something after the scheduler has started.</p> <p>First, do you have the FreeRTOS SVC handler installed? See &quot;Special note to ARM Cortex-M users&quot; in the first numbered bullet on this page: <a href="http://www.freertos.org/FAQHelp.html">www.freertos.org/FAQHelp.html</a></p> <p>If you are sure the SVC handler is installed, then try setting a break point in the SVC handler. It is called vPortSVCHandler() and is defined in whichever FreeRTOS/source/portable/[compiler]/ARM_CM[0,3,4,7]/port.c file you are building. Is the break point hit? If so, then it is not the code you show above that is the problem.</p> <p>If the break point is hit, step through the SVC handler until it returns. It should return into the first task that is selected to run.</p><div style="clear:both;"></div>