https://devzone.nordicsemi.com/f/nordic-q-a/124361/how-to-use-rtc-alarm-on-nrf54l15I am working on an nRF54L15 project and started from: C:\ncs\v3.0.2\nrf\samples\bluetooth\peripheral_uart as the base. I would like to trigger an interrupt once every second. Since the documentation says RTC consumes less power than the timer, I donen-USTelligent Community 13Mon, 15 Sep 2025 08:04:28 GMThttps://devzone.nordicsemi.com/thread/548700?ContentTypeID=1Mon, 15 Sep 2025 08:04:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c6c9a61-e9f8-491d-b863-4a4b5566cbb9H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> [quote user=""]Since the documentation says RTC consumes less power than the timer, I don’t want to use <code>k_timer_start</code> to generate the interrupt. Instead, I want to use RTC.[/quote] <p>Both these use GRTC as the backend for creating the timeout.</p> <p>The consumption will be similar.</p> [quote user=""]I would like to trigger an interrupt once every second.[/quote] <p>Here&#39;s a section on how to create a timer fitting your scenario:</p> <p><a href="https://docs.zephyrproject.org/latest/kernel/services/timing/timers.html#using-a-timer-expiry-function">https://docs.zephyrproject.org/latest/kernel/services/timing/timers.html#using-a-timer-expiry-function</a></p> <p>&nbsp;</p> <p>Please note the usage of a k_timer + workqueue in this scenario. This is because the k_timer handler will run in interrupt context, and you shall not call bluetooth APIs in ISR context.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>