Lpc2000

--- In lpc2000@yahoogroups.com, "sebfr74" <seb.jacquemard@9...> wrote:
> Hi,
> I use UART1 to make a rs485 with GPIO0.10 for the direction.
> I've got a problem, when I look the transmission with an oscilloscope 
> the sens go to level 0 just before the last character.
> I do this :
> ("p" is a pointer to the string to transfer and "n" the number of 
> characters)
> 
> do{
>    while (!(U1LSR & 0x20)) watchdog(); 
>    U1THR = *p++;
> } while (--n);
> 
> while (!(U1LSR & 0x20)) watchdog(); //wait last character transmit 
> 					
> IOCLR0=SENS; //SENS=Rxd --> rs485 in reception

The UART has double buffer, so you must do the test:
 
while (!(U1LSR & 0x60)) watchdog(); //wait last character transmit

for the REALLY end of transmision