void uart_init(void)
{
// baud=1=115.2K only with an external 3.6864MHz crystal:
unsigned int baud=1;
UBRRH=(unsigned char) (baud >>8);
UBRRL=(unsigned char) (baud & 0xFF);
/* enable tx/rx and no interrupt on tx/rx */
UCSRB = (1< /* format: asynchronous, 8data, no parity, 1stop bit */
UCSRC = (1<}