//USE UART1 PORT FOR MEGA128
//#pragma interrupt_handler rx_int:31
#define uchar unsigned char
uchar rx_data;

void uart_init()
{
UBRRL=0x67;   //osc=16M ,U2X=0,bit/s=9600
UBRRH=0x00;
UCSRB=(1<<RXEN)|(1<<TXEN)|(1<<RXCIE);    //RX Enable,TX Enable,RX interrupt Enable
UCSRC=(1<<UCSZ1)|(1<<UCSZ0);              //8bit data ,1bit stop
}

void uart_tx(uchar txc)      //send a uchar data
{
while(!(UCSRA&(1<<UDRE)));   //check send enable
UDR=txc;              
}


//查詢接收
uchar rx_c()
{
PORTC|=(1<<2);
while(!(UCSRA&(1<<RXC)));
PORTC|=(1<<3);
return UDR;
}