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 EFM32LG_STK3600 Development Kit
Device: EFM32LG990F256
