//#define F_OSC 2000000 unnötig da global via makefile angegeben

#define UART_BAUD_RATE 2400
#define UART_BAUD_CALC(UART_BAUD_RATE,F_OSC) ((F_OSC)/((UART_BAUD_RATE)*16l)-1)

void init_usart(void) {
	
	// baud Rate
	UBRRH = (uint8_t)(UART_BAUD_CALC(UART_BAUD_RATE,F_CPU)>>8);
	UBRRL = (uint8_t)UART_BAUD_CALC(UART_BAUD_RATE,F_CPU);

	// Receiver und Transmitter einschalten, RX Interrupt aktivieren
	UCSRB = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);

	//asyncron 8N1 (8 bit, keine Parität, 1 Stopbit)
	UCSRC = (1 << URSEL) | (3 << UCSZ0);
}


void usart_putc(unsigned char c) {
   // warten bis udr fertig
	while(!(UCSRA & (1 << UDRE)));
	UDR = c;    // senden
}


void usart_puts (char *s) {
	//  chars durchlaufen (bis *s != NULL)
	while (*s) {
		usart_putc(*s);
		s++;
	}
}


SIGNAL (SIG_UART_RECV) { // USART RX interrupt
	lcd_putc(UDR);
}


void hr20gettime(void) {
	
	lcd_clrscr();
	
	usart_putc('r');
	_delay_ms(5);
	usart_putc('1');
	_delay_ms(5);
	usart_putc('3');
	_delay_ms(5);
	usart_putc('6');
	_delay_ms(5);
	usart_putc(13);
	_delay_ms(500);

}