Lpc2000

Hi,
one of the possible solution is to start timer on transmitter empty 
event, initiated with a bit duration times bitframe length value 
(typical x10..11). During timer reload event you can simply switch 
RS485 line to rx mode.

I use this scenario in my design with no problem.

Grzegorz
--- In lpc2000@yahoogroups.com, "gfaurie1" <gilles.faurie@p...> wrote:
> 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