Here's a quick one, just comment out the guts of simpletx so it doesn't send data out the tx pin.
PHP Code:
#define myubbr (16000000/16/9600-1)
void simpletx( char * string ){
/* if (UCSR0B != (1<<TXEN0)){ //do we need to init the uart?
UBRR0H = (unsigned char)(myubbr>>8);
UBRR0L = (unsigned char)myubbr;
UCSR0B = (1<<TXEN0);//Enable transmitter
UCSR0C = (3<<UCSZ00);//N81
}
while (*string)
{
while ( !( UCSR0A & (1<<UDRE0)) );
UDR0 = *string++; //send the data
}*/
}