51单片机与PC机的串口通信,含有CRC校验

sendcount=8; begin_send(); while(1);

}

}

/*ISR (USART1_RX_vect) {

uchar temp,num2; cli();

PORTD&=~_BV(4); temp=UDR1;

buffer[num2]=temp-'0'; num2++;

if(num2==4)num2=0; _delay_ms(5); PORTD|=_BV(4); flag=1;

sei();

}*/