Serial.end() returns before the transmit pin is available for other uses.

What steps will reproduce the problem?
1.Serial.print() followed by a Serial.end()
2.Then toggle another pin.
3.Look at the TX pin and the other pin on a scope.

What is the expected output? What do you see instead?

The other pin gets toggled before the transmission is done.  We probably need 
to use the transmit complete interrupt to check for the end of the transmission 
(i.e. the byte has been shifted out of the shift register).

Please use labels and text to provide additional information.

Original issue reported on code.google.com by dmel...@gmail.com on 8 Mar 2011 at 3:06

Boo0ns / arduino

Serial.end() returns before the transmit pin is available for other uses. #500