According to the schematics user button should be on `PD5` not `PC5`
(so `GPIO_PIN(3, 5)`).
Due to the super high values resistors being used for the external
pullup it seems if you use a internal pullup it doesn't work.
The Sub-GHz Antenna of the Openmote-B is always connected to the AT86RF215.
It is the 2.4 GHz radial that can be switched between the CC2538 and the AT86RF215.
This changes the name of the defines accordingly.
It seems the doc was not added during the port.
This adds documentation similar to the openmote-cc2538.
This also expands on some flashing issues that have occurred.
Adapt the periph ADC implementation to use vendor defines where
ever possible. Remove duplicate or obsolete defines and adapt
board configuration as required.
Rework SPI periph driver to use proper RIOT GPIO API functions.
Also cleanup header files by using vendor defines and remove
obsolete code. Further, adapt board config accordingly.
The SPI bus frequency/clock is calculated relative to the MCUs
core clock. Currently all boards use the default 32MHz, hence
prescaler settings for SPI are all the same. This PR moves the
default config for 32MHz to the CPU and allows to be overriden
by board config if needed.
