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+============
+USB CDC ECHO
+============
+
+This demo behaves like a virtual COM port based on USD device CDC. It echoes
+back bytes received from the console.
+
+Drivers
+-------
+* USB Device
+
+Supported Evaluation Kit
+------------------------
+* SAM D21 Xplained Pro
+* SAM DA1 Xplained Pro
+* SAM R21 Xplained Pro
+* SAM D11 Xplained Pro
+* SAM L21 Xplained Pro
+* SAM L22 Xplained Pro
+* SAM V71 Xplained Ultra
+* SAM E70 Xplained
+* SAM G55 Xplained Pro
+* SAM E54 Xplained Pro
+
+Interface Settings
+------------------
+* No extra board or wire connection is needed.
+* The enumerated serial port does not bridge to any specific USRT hardware but
+  simply loopback data, so whatever serial port setting works.
+
+Running the Demo
+----------------
+
+1. Download the selected example, or export the example to save the .atzip file.
+2. Import .atzip file into Atmel Studio 7, File->Import->Atmel Start Project.
+3. Build and flash into supported evaluation board.
+4. Connect PC host and TARGET USB plug with a USB cable.
+5. Press the RESET button.
+6. The serial port is detected by host PC. On Linux the driver will be installed
+   automatically. On Windows The INF and CAT file required can be extracted from
+   .atzip or found in generated Atmel Studio 7 project folder, relatively at
+   ./usb/class/cdc/device.
+7. Open the detected/enumerated serial port using a serial port monitor
+   (e.g., TeraTerm).
+8. Whatever sent from the serial port monitor will be echoed back then.