Hi,
I have a simple battery powered remote control device with a NRF51822 and using the Gazelle protocol for communication with the host.
To save battery the MCU goes into System OFF state (I am using the power management module from the Smart Remote example). To wake up one of two push buttons have to be pressed or a rotary encoder has to be turned. Basically this works as desired and the power consumption is sufficiently low.
My questions are:
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How do I avoid to re-initialize Gazelle protocol after a wake up? In general is there a way to preserve the system status before entering System OFF state, thus avoiding re-initialization?
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When I press a button to wake up the MCU, the button press is not recognized by the application (though the system wakes up as desired). I have to press a button once to wake up and again to be recognized by the application (gpiote event handler). I assume this happens because multiple initialization routines are executed in the main(), so the transition from high to low is missed. Is there a way to figure out which gpio pin has woke up the system? Is there a general advise how to handle a wake up situation?
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How would an alternative to System OFF look like? Is if possible to achieve similar results regarding power saving when setting the system to sleep mode (using __WFI or __WFE commands)?
Thank you in advance!
