sf.c

串口看门狗模块的程序

#include "STC12C2052AD.H"

/****************************************************************************/
sbit   RESET = P1^0;

unsigned char UartStauts =0;  //串口接收状态
unsigned char DataWord; //接收到数据字节
unsigned char b_validFrame; //桢标志

unsigned int Count =0;  
/****************************************************************************/


/******************************************************************************

******************************************************************************/


/************单片机初始化************************/
void mcu_int(void)
{
        TMOD=0x21;                       //timer1 mode2 timer0 mode1

        TL1=0xfc; TH1=0xfc;                       //9600bps
                                //BAUD
        PCON=0;	                     	 //SMOD=0
        SCON=0x50;                       //seria0 mode 1

        IP=0X10;                         //give the highest interrupt priority
       //16f5--50ms(14.31818)
        TL0=0x16;                        //timer  is 50ms
        TH0=0xf5;

       
        ET0=1;                           //Enable time0
        ES=1;                            //Enable serial

        EA=1;
        TI = 0;

        TR0=1;
        TR1=1;
       
}
/*******************UART 中断处理程序*****************************/
void serial0_process(void)  interrupt  4 using 1
{ 
 if(RI)
 {
  EA=0;RI=0;
  
  switch(UartStauts)
   {
    case  0 :       
			if(SBUF != 0xeb)UartStauts=0x00;
			else UartStauts=0x01;
			    break;

	case  1 :       
			DataWord=SBUF;	
            UartStauts=0x02;		
			break;

     case  2 :       
			if(SBUF == 0xfb)
			   b_validFrame = 1;
			  else b_validFrame = 0;
            UartStauts=0x00;
			    break;

   }
  
  EA=1;
  }
}

/****************************************************************************/
void timer0(void) interrupt 1  using 1
{

    TL0=0x16;                       //timer  is 50ms
    TH0=0xf5;
	ET0=0;                         //turn off the time0`s interrupt

  Count ++;
   if(Count >= 3500 )
    {
	  Count = 0 ;
	 
	}

	
    ET0=1;                      //turn on the time1`s interrupt
}



/****************************************************************************/
void main()
{
    RESET = 0;
      mcu_int();
	  while(1)
	    {
		 if(b_validFrame == 1)
		  {
		    b_validFrame = 0;
			 if(DataWord == 0x01)
			 {
			  Count = 0;
			 }
		  }
		  if(Count == 3200)
		    {
			  RESET = 1;
			}
		   if(Count == 3450)
		   {
		     RESET = 0 ;
		   }
		}

}