how can i synchronize these routines?

[DevineFelix]

hi.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 that those tasks can be processed immediately and efficiently. There is a RTC timer routine that is executed periodically to get some data from peripheral. So there are three priority level in execution: softdevice call is the first, RTC timer the second, and the main loop the last. Can I use disable_irq in low priority to achieve synchronization without degrading the ble performance? Or is there any other synchronization mechanism under the background of softdevice? thank you.

[Stefan Birnir Sverrisson]

Hi

Perhaps this thread can help you out.

For synchronization with radio events, the application can enable radio notifications

[DevineFelix]

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.