IRQ_DIRECT_CONNECT not calling the ISR functionhttps://devzone.nordicsemi.com/f/nordic-q-a/123759/irq_direct_connect-not-calling-the-isr-functionHello. I&#39;m trying to call an interrupt service routine (ISR) using IRQ_DIRECT_CONNECT, but it is not working. Here is the flow of my code: So, it is expected to print out &#39;TWIM Interrupt Triggered&#39;, but there are no events shown in my RTT vieweren-USTelligent Community 13Mon, 18 Aug 2025 07:50:33 GMTRE: IRQ_DIRECT_CONNECT not calling the ISR functionhttps://devzone.nordicsemi.com/thread/545874?ContentTypeID=1Mon, 18 Aug 2025 07:50:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0a99fc3-4b35-4dee-971b-f858410b8228Vidar Berg<p>Also, I don&#39;t see what the value of &#39;irq_type&#39; is from the snippets you posted so I&#39;m wondering&nbsp;what events you are configuring to trigger the interrupt in your enableIRQ() function? I would recommend starting a debug session in VS code/ozone/gdb and place a breakpoint in the ISR instead.&nbsp;</p> <p><pre class="ui-code" data-mode="c_cpp">NRF_TWIM0-&gt;INTENSET = irq_type;</pre></p><div style="clear:both;"></div>RE: IRQ_DIRECT_CONNECT not calling the ISR functionhttps://devzone.nordicsemi.com/thread/545871?ContentTypeID=1Mon, 18 Aug 2025 07:43:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a277a198-31dd-47c4-b053-33228cbed495Turbo J<p>Careful, <code>printk()</code> can dead lock in an interrupt handler.</p> <p>Check dts files in build/zephyr folder, the first UARTE/SPIM/TWI peripherial might be in use by default.</p><div style="clear:both;"></div>