https://devzone.nordicsemi.com/f/nordic-q-a/28834/nrf51-dk-keil-go-to-definition-of-xxx-fails-link-failsHello, I&#39;ve a silly problem I cannot get rid of. I&#39;ve started from nRF5_SDK_11.0.0 ( devzone.nordicsemi.com/.../) and now I want to implement it in another example but in nRF5_SDK_12.3.0. I did the same imports (in Options for Target ...-&gt; Cen-USTelligent Community 13Mon, 01 Jan 2018 22:51:22 GMThttps://devzone.nordicsemi.com/thread/114176?ContentTypeID=1Mon, 01 Jan 2018 22:51:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2192db93-ea45-4788-9959-74aefbe40ed1JohnM<p>Thanks for the tip, this might be why it didn&#39;t work. I will test it asap I come back to this project.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/114175?ContentTypeID=1Fri, 29 Dec 2017 11:51:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:07907b6d-5f56-48e2-a44d-ae71145efb34vam5104<p>Did you enable Timer in nrf_drv_config.h?</p><div style="clear:both;"></div>