this is the USB CDC Echo example project source code,
for the Microchip SAM E54 Xplained Pro development board,
based on the ATSAME54P20A micro-controller,
exported from the Atmel START website,
using the ASFv4 library.
Change-Id: Ic0e58e42d1a4076bc84a0a8d3509ec4b09a37f46