Add an object to retain data across both reboots and entry to
SYSTEM_OFF. This only works on nRF52, since nRF51 and nRF53 require
different low-level operations to configure RAM retention.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Due to a long standing difference of requirements enabling deep sleep
will by default cause any application that delays for an unbounded
period to power down. On Nordic doing so turns the system off. Show
how to prevent this from happening while still allowing deep sleep
states to be available for the application's controlled use.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Currently system power management does not automatically control
device power, and this example demonstrates high current draw due to
the UART being enabled. Enable device power management and
demonstrate how to manually turn off greedy devices.
Also remove the 60 s delay that confirms we successfully turned off
the residency policy; that's not directly relevant to the purpose of
the sample.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
The board name for the nRF52 DK, so far known as nrf52_pca10040, is
renamed to nrf52dk_nrf52832. Its documentation and all references
to its name in the tree are updated accordingly. Overlay and
configuration files specific to this board are also renamed, to
match the new board name.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
The Nordic SOC doesn't support multiple system power states, only one
deep sleep state. Replace the old example with a simpler one that can
be used to measure CPU active, normal sleep, and system off modes.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
Peter Bigot