[avr-gcc-list] UART transmitting problem

[Laurence Anderson]

Hi,

Could somebody tell me if the following code should work on an AT90S8515? I'm 
using 9600bps, no parity, 1 stop bit settings on the pc, but see nothing. I'm 
suspicious its a hardware problem, so I'd appreciate it if somebody could 
verify the code I'm using.

Cheers,

Laurence

#include <io.h>

#define F_CPU            4000000      /* 4Mhz */
#define UART_BAUD_RATE      9600      /* 9600 baud */
#define UART_BAUD_SELECT (F_CPU/(UART_BAUD_RATE*16l)-1)

char *message = "Testing, testing, 1-2-3";

int main()
{
        char c, *buf = message;

        // enable transmit
        outp( BV(TXEN), UCR );

        // set baud rate to 9600
        outp( UART_BAUD_SELECT, UBRR );

        while ( ( c = *(buf++) ) != '\0' ) {
                loop_until_bit_is_set( USR, UDRE );
                outp( c, UDR );
        }

        while(1); // Loop forever
}