https://devzone.nordicsemi.com/f/nordic-q-a/37009/gpiote-and-template-projectHello, I studied the &quot;gpiote&quot; example in the SDK. In order to fully understand how it works, I attempted to modify the &quot;template_project&quot; example and follow the process of &quot;gpiote&quot; example. I am pretty much convinced that what I have done in the en-USTelligent Community 13Thu, 02 Aug 2018 12:31:51 GMThttps://devzone.nordicsemi.com/thread/142610?ContentTypeID=1Thu, 02 Aug 2018 12:31:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ade4224f-d33c-427c-bc1f-fd2bc7e4c9caFormerMember<p>The reason for this problem is the frequency set for the timer in sdk_config.h: In the gpiote example, it is set to 1 MHz, while in template_project, it is set to 16MHz. So in template_project, the LED is blinking, but&nbsp; too fast for us to see it. Changing the frequency to 1 MHz solves the problem.</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-efa235b3d4f7455e80937dbc4e1d0a62/freq.PNG" alt=" " /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/142515?ContentTypeID=1Thu, 02 Aug 2018 07:22:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:14d75a75-40e4-40b9-8542-d7daf6847c1cjdelapena<p>Thank you for the response. However, I am not using the &quot;ble_app_template&quot; project. I am using purely the &quot;template_project&quot; project (SDK-examples-peripheral-template_project).<br /><br />Logging is disabled in &quot;template_project&quot; sdk_config.h&nbsp;<span>(NRF_LOG_ENABLED 0).</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/142402?ContentTypeID=1Wed, 01 Aug 2018 12:37:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:08ff7c9f-998c-4689-81ee-31ad03ac5311FormerMember<p>The problem is that the nRF_Log module is enabled in ble_app_template (sdk_config.h),&nbsp; not initialized in the GPIOTE example code. Therefore, when encountering a NRFX_LOG_XXX() statement, the chip will hang (nrfx_ppi.c, line 263). To solve the problem either disable logging in sdk_config.h (NRF_LOG_ENABLED 0) or initialize logging in main().</p><div style="clear:both;"></div>