With this test, you can tie external TXD and RXD together, and on the USB console, see the characters entered be echo'd back. This is effectively a loopback test verifying the external hardware interface, through the USB console interface.
History
Library Update Only.
2013-12-15, by dixter1 [Sun, 15 Dec 2013 21:42:43 +0000] rev 1
Library Update Only.
First revision this code. If external pins D0/D1 are connected, this performs an external loopback test.
2013-12-13, by dixter1 [Fri, 13 Dec 2013 23:45:09 +0000] rev 0
First revision this code. If external pins D0/D1 are connected, this performs an external loopback test.