https://devzone.nordicsemi.com/f/nordic-q-a/3265/help-debugging-nrf51822I&#39;m using Keil to debug my application. Softdevice was loaded w/ Studio and when I click on Debug Keil loads the code but it does not stop at any breakpoint I set. It does not even stop in main() I cannot step through either. which ROM addresses isen-USTelligent Community 13Sat, 26 Jul 2014 04:16:25 GMThttps://devzone.nordicsemi.com/thread/11944?ContentTypeID=1Sat, 26 Jul 2014 04:16:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e9eaffc-83a2-4ada-a99d-5f1ca8e79f4fNguyen Hoan Hoang<p>I am not using Keil so don&#39;t if any thing special needs to be configured but I have some hints that you can check. The SDK5 is to be used with SD6 and app starts at 0x14000. The SDK6 is for SD7 and app starts at 0x16000. There are also preprocessors defined that you need to set. You need at least have these preprocessor defined in your project.</p> <p>NRF51822_QFAA_GC</p> <p>BLE_STACK_SUPPORT_REQD</p> <p>NRF51</p><div style="clear:both;"></div>