https://devzone.nordicsemi.com/f/nordic-q-a/51894/with-softdevice-enabled-the-freertos-queue-receive-once-in-a-while-takes-around-300-usHello, I am using nordic nrf52 SDK version : v15.2.0 Freertos version : V10.0.1 The system has hardware timer which runs at 6.4KHz. For every 1.6 KHz, from timercallback, there is one value sent to task using &quot;xQueueSendFromISR&quot;. The task receiveen-USTelligent Community 13Mon, 09 Sep 2019 11:11:46 GMThttps://devzone.nordicsemi.com/thread/208640?ContentTypeID=1Mon, 09 Sep 2019 11:11:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e8099ca-b0ef-4c5a-b61e-70dd640ec26bVidar Berg<p>Hi,</p> <p>As you may know, the Softdevice reserved the highest interrupt priorities to handle timing-critical protocol events, see <a title="Processor usage patterns and availability" href="https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/processor_avail_interrupt_latency/processor_usage_patterns.html?cp=3_4_3_0_15_2">Processor usage patterns and availability</a>. So application&nbsp;tasks will get blocked from time to time. Would it be possible to&nbsp;execute this timing in the ISR context, and possibly with a higher interrupt priority to mitigate this?&nbsp;&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>