// Funkce pro UART:
void init_uart (unsigned int baud);         //inicializace UART
unsigned char u_getc( void );               //přijmi znak z UART
void u_putc( char data );                   //napiš znak do UART
void u_puts( char *text );                  //napiš string do UART


void init_uart (unsigned int baud)
{
			
	if(baud==4800) {UBRRH=0;UBRRL= 143;}		//rychlosti plati pro f=11.0592Mhz	
	if(baud==9600) {UBRRH=0;UBRRL= 39;}
	if(baud==19200) {UBRRH=0;UBRRL= 35;}
	if(baud==38400) {UBRRH=0;UBRRL= 17;}


UCSRB = (1<<RXEN)|(1<<TXEN); 				//UCSRB=0x18; příjem zapnut, vysílání zapnuto
UCSRC = (1<<URSEL)|(1<<USBS)|(3<<UCSZ0);	//UCSRC=0x06; 8-bit, 1 stopbit, bez parity
}


// UART pošli znak:
void u_putc( char data )
{

	while ( !( UCSRA & (1<<UDRE)) )     // Wait for empty transmit buffer
	;
	UDR = data;                         // Put data into buffer, sends the data
}


// UART pošli string:
void u_puts( char *text )
{
	unsigned char i=0,temp;
	do
	{
		temp = text[i];
		if(temp==0) break;
		u_putc(temp);
		i++;
	}
	while(temp>0);
}

// UART přijmi znak:
unsigned char u_getc( void )
{
	while ( !(UCSRA & (1<<RXC)) )       // Wait for data to be received
	;
	return UDR;                         // Get and return received data from buffer
}