Board Support Package API demo for voltage and current readout.

This example project uses the EFM32 CMSIS and demonstrates the use of 
the STK BSP.

The BSP is used to read out the current consumption and VMCU voltage level
from the board controller. The readings are printed to the display.

The BSP use a 115800-N-1 UART to communicate with the board controller,
if you do not need the board support functions, there is no need to 
include the BSP in your project. Currently, the UART communication with 
16x oversampling is used, limiting the communication channel to high 
frequencies for the peripheral clock.

Board:  Silicon Labs EFM32-Gxxx-STK Development Kit
Device: EFM32G890F128
