uint8_t uart_init(uint32_t baudrate, uint16_t format)
{
    /* function sets up the UART interface */
    /* parmeter: baud rate gives the operation speed of the interface
		 format gives the data format in a int value
		    hundrets: number of data bits
		    tens:     paraity (0 - no, 1 - odd, 2 - even)
		    ones:     number of stop bits (1 or 2) */		
						
    UBRRH = (F_CPU/(16 * baudrate) - 1) >> 8;
    UBRRL = F_CPU/(16 * baudrate) - 1;
    UCSRB |= (1<<RXCIE)|(1<<TXEN)|(1<<RXEN); //receiver, transmitter enable
	
    switch(format/100)
    {
	case 9:	 UCSRB |= (1<<UCSZ2);
		 UCSRC |= (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); 
		 break;
	case 8:	 UCSRC |= (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);
		 break;				
	case 7:	 UCSRC |= (1<<URSEL)|(1<<UCSZ1);
		 break;				
	case 6:	 UCSRC |= (1<<URSEL)|(1<<UCSZ0);
		 break;
	default: break;
    }
	
    switch((format%100)/10)
    {
	case 2:	 UCSRC |= (1<<URSEL)|(1<<UPM1);
                 break;
	case 1:  UCSRC |= (1<<URSEL)|(1<<UPM1)|(1<<UPM0);
		 break;
	default: break;
    }
    
    if(format%2 == 0) UCSRC |= (1<<URSEL)|(1<<USBS);
    
    uart_in_rd = 0;
    uart_in_wr = 0;
    uart_in_cnt = 0;
    uart_out_rd = 0;
    uart_out_wr = 0;
    uart_out_sts = 0;
    return(0);
}