BSP_EVENT_SYSOFF vs BSP_EVENT_SLEEP

[chaitz]

Hi,

This is about BSP button events to manage system sleep/wakeup. In the power management example in the SDK what is the difference between BSP_EVENT_SYSOFF and BSP_EVENT_SLEEP? Doesn't system off mean shutdown as per the comment in bsp.h?

[Einar Thorsrud]

Hi,

The BSP provides standardized ways to SDK examples for taking commands from buttons and signalling states via LED's. However, some examples handles the signals a bit differently. Therefor, you should consider the BSP documentation the normal/default intention of each event, but you should refer to example documentation (or code itself) to see the specific exact meaning in that example/context.

In this case, the Power Management Example use the signals in a special way, as indicated by the documentation:

Go to System OFF

1. Shortly press Button 2 to immediately switch to System OFF state (if the application is ready), without waiting for timeout.
2. Pressing Button 1 will toggle the ready status.
3. Wake up the application from System OFF by pressing Button 2.
4. Alternatively, you can touch the NFC antenna (if present) with a smartphone or a tablet to wake up the application.

Go and stay in System OFF

1. Press and hold Button 2 to immediately switch to System OFF state (if the application is ready) and stay in it.
2. Pressing Button 1 will toggle the ready status.
3. From this point, the application requires an external reset to restart because the wakeup mechanism is not set up.

[chaitz]

Thanks for the reply. So, in the second scenario the system never wakes up because the m_stay_in_sysoff is true not because there is no wakeup button config?

Also, I am observing that my system wakes up on button press even though button isn't configured to do so. Could this be due to some settings in GPIOTE for the button?

[antoniov]

Hi,

the same for me. Did you menage to understand why?