https://devzone.nordicsemi.com/f/nordic-q-a/21153/freertos-port-xtickcount-bugHello, I used latest port_cmsis_systick.c from SDK13.0. And there is still xTickCount bug. Function vPortSuppressTicksAndSleep() adds correct vTaskStepTick(diff); but the trouble is that you do not clear NRF_RTC_EVENT_COMPARE_0 . This way the RTC ISRen-USTelligent Community 13Thu, 06 Apr 2017 17:14:21 GMThttps://devzone.nordicsemi.com/thread/82777?ContentTypeID=1Thu, 06 Apr 2017 17:14:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:442426e4-81eb-4c67-97b0-561da0e2de85vit bernatik<p>Here is fixed <a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/2474.port_5F00_cmsis_5F00_systick.c">port_cmsis_systick.c</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82776?ContentTypeID=1Thu, 06 Apr 2017 16:57:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8bd5c453-22a9-4ba3-a5bb-3096182c5e53Susheel Nuguru<p>can you please attach the changes you did so that i can quickly review it and comment on your changes.</p><div style="clear:both;"></div>