https://devzone.nordicsemi.com/f/nordic-q-a/60711/interrupt-request-irq-not-getting-executedHello I am using Seggar Embedded Studio for ARM V3.4 and nRF_SDK 12.3.0. I am trying to understand interrupts and interrupt handlers. The interrupt request for Watchdog timer (i.e. void WDT_IRQHandler(void)) is not getting executed. The control isen-USTelligent Community 13Mon, 27 Apr 2020 14:40:32 GMThttps://devzone.nordicsemi.com/thread/246907?ContentTypeID=1Mon, 27 Apr 2020 14:40:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cf5c1603-446c-4061-ad44-ba990499b6e8Allen924<p>I did the following attempts to verify if the control was going to WDT_IRQHandler()</p> <p>First, I tried to switch on the LED</p> <p>Second, I tried to switch off the LED</p> <p>Third, Only a printf() statement inside WDT_IRQHandler() (in debug mode)</p> <p>The above attempts did not work.</p> <p></p> <p>I have defined the following Preprocessor Definitions:-</p> <p>NO_VTOR_CONFIG</p> <p>BLE_STACK_SUPPORT_REQD</p> <p>NRF51422</p> <p>BOARD_PCA10028</p> <p>SWI_DISABLE0</p> <p>NRF51</p> <p></p> <p>Would these affect the execution of IRQ in any way?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/246651?ContentTypeID=1Sun, 26 Apr 2020 18:38:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5d991750-af62-4178-af13-185535f51165Turbo J<p>How did you check?</p> <p>The out pin toggle should be visible in an oscilloscope only - but not with the naked eye (LED) or a multimeter.</p> <p>The printf() won&#39;t be able to do anything useful in only two LF clock cycles.</p><div style="clear:both;"></div>