Lpc2000

Hello,

I try to develop a RS485 driver, but i have a problem.

As you know, you must stay in reception and when you have to transmit, 
you change direction to be in transmission only during transmission. 
When the last character has been transmitted you turn back in 
reception.

Problem is that i have no interruption on shift register empty. I have 
an interruption when transmitter is empty but if i change direction at 
this time, character which is in shift register is not transmitted, 
and i lose it.
The only solution that i suppose is to check state of shist register 
(LSR) in polling but i'd like to find a more real time solution

Who can help me ?

Thank