comint.c

pc机与rs232串口的通讯C51源程序。

#include "reg52.h"
sbit _led = 0x97;
void Init_Com(void)
{
     TMOD = 0x20;
     PCON = 0x00;
     SCON = 0x50;													//		;串口为方式1	8 UART
     TH1 = 0xFd;
     TL1 = 0xfd;
     TR1 = 1;										//		;波特率9600
     REN = 1;
     ES = 1;
     EA = 1;
}
void ComInt() interrupt 4
{
    unsigned char dat;
    ES = 0;
    RI = 0;
    dat = SBUF;
    SBUF = dat;
    do{}while( TI == 0 );
    _led = 0;
    TI = 0;
    ES = 1;
}


void Delay_xMs(unsigned int x)
{
        unsigned int i,j;
        for( i =0;i < x;i++ )
        {
                for( j =0;j<1000;j++ );
        }
}
void main()
{
  Init_Com();
  while(1)
  {
        Delay_xMs(5);
        _led = 1;
  }
}