https://devzone.nordicsemi.com/f/nordic-q-a/5405/how-can-i-synchronize-these-routineshi.I have a question about synchronization. In main loop, there is a function sd_app_event_wait() which blocks until ble event from softdevice call occurs, so I want to put all communication-related tasks after that fanction in order to make sure thaten-USTelligent Community 13Thu, 05 Feb 2015 14:58:28 GMThttps://devzone.nordicsemi.com/thread/18874?ContentTypeID=1Thu, 05 Feb 2015 14:58:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:222a49fb-7970-401d-a1aa-def3175cc050Stefan Birnir Sverrisson<p>Yes, it sounds you have understood this correctly.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/18873?ContentTypeID=1Wed, 04 Feb 2015 06:15:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:48369fa4-8767-426f-a1b4-359ea9fb891dDevineFelix<p>Thank you, Stefan. you say that softdevice callbacks have the same priority level as low priority app interrupts have, so each of them can not be preempted by the other? If so, there is no synchronization problem between softdevice callbacks and low priority app interrupts. sd_nvic_critical_region_enter() is needed by the routines in main loop to protect shared resources. Have i got the point? thank you.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/18872?ContentTypeID=1Tue, 03 Feb 2015 14:59:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8a10f404-cd71-4fd7-8fad-5207eab758dbStefan Birnir Sverrisson<p>Hi</p> <p>Perhaps <a href="https://devzone.nordicsemi.com/question/28011/sd_nvic_critical_region_enterexit-specifications/?answer=28768#post-id-28768">this thread</a> can help you out.</p> <p>For synchronization with radio events, the application can enable <a href="https://devzone.nordicsemi.com/question/28577/increase-delay-between-radio-event-and-cpu-cycle/?answer=28643#post-id-28643">radio notifications</a></p><div style="clear:both;"></div>