8路数字电压表的设计.c

8路数字电压表,有过流保护,过载保护

#include <AT89X51.h>
#include <intrins.h>
#define  ad_con  P3
#define  addata  P0
#define  Disdata  P1
#define  uchar  unsigned   char
#define  uint  unsigned    int
sbit   ALE=P3^5;
sbit   START=P3^6;
sbit   OE=P2^5;
sbit   EOC=P3^2;
sbit   DISX=Disdata^7;


uchar  code  dis_7[11]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff};
uchar  code  scan_con[4]={0xfe,0xfd,0xfb,0xf7};
uchar  data  ad_data[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
uint   data  dis[5]={0x00,0x00,0x00,0x00,0x00};


delay1ms(uint  t)
{
   uint   i,j;
   for(i=0;i<t;i++)
      for(j=0;j<120;j++);
}

scan()
{
   uchar   k,n;
   uint   h;
   dis[3]=0x00;
   for(n=0;n<1;n++)
     {   
       dis[2]=ad_data[n]/51;
       dis[4]=ad_data[n]%51;
       dis[4]=dis[4]*10;
       dis[1]=dis[4]/51;
       dis[4]=dis[4]%51;
       dis[4]=dis[4]*10;
       dis[0]=dis[4]/51;
       for(h=0;h<500;h++)
       {
          for(k=0;k<4;k++)
           {
             Disdata=dis_7[dis[k]];
             if(k==2){DISX=0;}
             P2=scan_con[k];delay1ms(1);P2=0xff;
        
		   }
        }
      // dis[3]++;
 	  
	   }
}




test()
{
  uchar   m;
  uchar   s=0x00;
  //ad_con=s;
  for(m=0;m<1;m++)
    {
      ALE=1;_nop_();_nop_();ALE=0;
      START=1;_nop_();_nop_();START=0;
      _nop_();_nop_();_nop_();_nop_();
      while(EOC==0);
      OE=1;ad_data[m]=addata;OE=0;//s++;ad_con=s;
     }
    //ad_con=0x00;
}





main()
{
   P0=0xff;
   P2=0x00;
   P1=0xff;
   P3=0xff;
   while(1)
     {
      test();
	  scan();
      }

}