#include <avr/io.h>
#include <stdint.h>
//#include <stdlib.h>

#ifndef F_CPU
#define F_CPU 1000000           /* Oszillator-Frequenz in Hz */
#endif
 
// Hilfsmakro zur UBRR-Berechnung ("Formel" laut Datenblatt)
#define UART_UBRR_CALC(BAUD_,FREQ_) ((FREQ_)/((BAUD_)*16L)-1)
 
#define UART_BAUD_RATE 2400

/*int uart_putc(uint8_t c)
{
    while (!(UCSR0A & (1<<UDRE0))); 
	UDR0 = c;                     
    return 0;
}
 
void uart_puts (char *s)
{
    while (*s)
    {    
        uart_putc(*s);
        s++;
    }
}

int uart_init(void)
{
    UCSR0B |= ( 1 << TXEN );			// UART TX einschalten
    UCSR0C |= (0 << UMSEL0)|( 3<<UCSZ0 );	// Asynchron 8N1
    UBRR0H = (uint8_t)( UART_UBRR_CALC( UART_BAUD_RATE, F_CPU ) >> 8 );
    UBRR0L = (uint8_t)UART_UBRR_CALC( UART_BAUD_RATE, F_CPU );
    return 0;
}
*/

void delay(uint16_t count)
{
	 uint16_t k;
	 for (k = 0; k <= count; k++){;}		
}


int main(void)
{
	

	
    int k;

    //uart_init();
    UCSR0B |= ( 1 << TXEN );			// UART TX einschalten
    UCSR0C |= (0 << UMSEL0)|( 3<<UCSZ0 );	// Asynchron 8N1
    UBRR0H = (uint8_t)( UART_UBRR_CALC( UART_BAUD_RATE, F_CPU ) >> 8 );
    UBRR0L = (uint8_t)UART_UBRR_CALC( UART_BAUD_RATE, F_CPU );

    DDRD = 0xff;    

		 
	for (;;)
	{
	
	for (k = 0; k <= 1000; k++){;}
	PORTD ^= 0xff;
	
        } 
 
 return 0;
    
}