Test usb connection

Dependencies:   BufferedSerial MODSERIAL mbed

You can find more infos in this notebook: HERE

Revision:
0:6da981eb59da
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MODSERIAL.lib	Sat Aug 20 17:33:55 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/AjK/code/MODSERIAL/#ae0408ebdd68