Difference between WFE and sd_app_evt_wait

[Jacob A]

Hi,

What is the difference between using WFE and sd_app_evt_wait to force the processor into sleep mode?

We're trying to optimize for power consumption, and somehow we save more power when using WFE, compared to using sd_app_evt_wait. On the other hand, the Bluetooth connection seems unresponsive or slow with WFE.

Best, Jacob

[Eirik Midttun]

The sd_app_evt_wait is basically the safe version of WFE when using the SoftDevice. Since the SoftDevice is running in a different context than your application you cannot know if it is safe to use WFE. Therefore, use the SD function.