#define F_CPU 16000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

void init_USART3();

int main(void)
{   
    //uint8_t kbdcnt=0, kbddata;
    
    init_USART3();
    DDRB = 0x80;
    
    //sei();  // enable global interrupts
    // loop forever
    while(1)
    {
        UDR3 = 'A';
        PORTB ^= 0x80;
        _delay_ms(1000);
    } // while(1)
}

void init_USART3()
{
    UBRR3H = 0;
    UBRR3L = 103;           // 9600 at 16MHz
    //UBRR1H = 0;
    UCSR3B |= (1<<RXEN3)|(1<<TXEN3);   // TX enable
    //UCSR1C |= (1<<UCSZ11)|(1<<UCSZ10);  // 8 bits DATA
    UCSR3C = 0x06;
    //DDRD |= (1<<3);
}