Lpc2000

Yes i could do that but i don't want to wait in my interruption routine 
during character transmission which could be about 1ms (at 9600 baud).


----- Original Message ----- 
From: "Yves Rondeau" <op173039@...>
To: <lpc2000@yahoogroups.com>
Sent: Monday, September 19, 2005 11:17 AM
Subject: RE: [lpc2000] RS485


> Hello ,
>
> I had the same problem on ISO7816 communication.
> At the end of TX I switch back in input mode then lost the 2 last bytes.
>
> Add those lines at the end of your TX routines
>
> while (!(U1LSR & 0x40));   /* Wait if U1THR & U1TSR not empty */
>
>
>     /* we need to wait for the 2 Tx Buffer */
>    /* to be empty */
>    /* or we can lost the 2 bytes switching
> */
>    /* in input */
>  PINSEL0 = 0x00040000;    /* RX UART1 Enable -TX Disable */
>
>
>
> Yves
>
> -----Original Message-----
> From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf 
> Of
> gfaurie1
> Sent: segunda-feira, 19 de Setembro de 2005 7:44
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] RS485
>
> 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
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>