https://devzone.nordicsemi.com/f/nordic-q-a/80384/proper-way-to-configure-clock-with-hfxo-in-a-freertos-projectHi, I&#39;m working on a FreeRTOS (I just start to use it, so I&#39;m a beginner) project in wish we want to use an external 32 MHz crystal. The program has a task that should be executed during a period of time of 125ms. Using the internal clock, the task executesen-USTelligent Community 13Thu, 07 Oct 2021 11:08:31 GMThttps://devzone.nordicsemi.com/thread/332996?ContentTypeID=1Thu, 07 Oct 2021 11:08:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a834c893-f5ec-4707-8d4b-b7980a15081drun_ar<p>Hi,</p> <p>Which SDK are you using? and did you see the example we have for freertos: <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/freertos.html">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/freertos.html</a></p> <p>Also check out the documentation her: <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/group__nrf__drv__clock.html#ga425c8dc0508bb9c0777da123b7c66f3d">nrf_drv_clock_lfclk_request</a></p> <p>And maybe also use&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/group__nrf__drv__clock.html#gae25988638664f2e4da8512b221adfdfd">nrf_drv_clock_hfclk_request</a>&nbsp; to check if the clock is started before proceeding from clock init.</p> <p></p><div style="clear:both;"></div>