USBXpress Test Panel example

This example project demonstrates the EFM32 USBXpress firmware library.
It communicates with the TestPanel host application to send and receive data.
TestPanel is included in the USBXpress SDK, available for download at:

https://www.silabs.com/products/mcu/Pages/USBXpress.aspx

Board:  Silicon Labs EFM32GG_STK3700 Development Kit
Device: EFM32GG990F1024
