Use a common begin() method that can be called from derived classes
to contain the shared initialization code.
Signed-off-by: Frieder Schrempf <frieder@fris.de>
Add the necessary code to properly power-off the Xiao + Wio
companions. This way we can achieve around 15 microamps of power
consumption in the off state.
Signed-off-by: Frieder Schrempf <frieder@fris.de>