https://devzone.nordicsemi.com/f/nordic-q-a/10129/nrf52-debug-in-keilI&#39;m a hardware/beginning software guy just getting the nRF52 up and running using the Keil uVision5 tools. I go to debug either the blinky project or heartrate project and I can&#39;t seem to step through code/set breakpoints. I can stop and run the codeen-USTelligent Community 13Fri, 06 Nov 2015 21:44:23 GMThttps://devzone.nordicsemi.com/thread/37569?ContentTypeID=1Fri, 06 Nov 2015 21:44:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6622ca69-09b9-4172-befa-c50b487baab9Adam Sillye<p>For me it works pretty well. Sometimes I have to do a Debug-&gt;Start/Stop debug session, but otherwise stepping and breakpoints are working correctly. I am using PCA10040.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37570?ContentTypeID=1Fri, 06 Nov 2015 21:40:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bb735c3e-b68b-4ed2-b0c4-3fcff76a959dtcbriese<p>It was just the optimization level was set to 3 instead of 0 in the C/C++ options for the target. I can now set breakpoints/debug.</p><div style="clear:both;"></div>