标准数字表1.c

再分享一个数字万用表的源码

#include<reg52.h>
#include<math.h>
#include<absacc.h>
number[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
number1[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
sbit four=P2^0;
sbit three=P2^1;
sbit two=P2^2;
sbit one=P2^3;
sbit ST=P3^0;
sbit OE=P3^1;
sbit EOC=P3^2;
unsigned int adcdata, adcdata3;
unsigned int i;
unsigned int adc0[8];
unsigned int k;

unsigned int avedata();
void show();
void delay_2ms();




void main()
{

  P2=0xff;
  P3=0xff;

  OE=0;
  ST=0;
  ST=1;

  while(1)
 {
   ST=0;

   while(!EOC);
   OE=1;
   adcdata=avedata();

   show();
  ST=1;
 }
}


 //----------------------------------

 void show()
 {
  unsigned int adcdata1;
  adcdata1=adcdata*19;

   four=0;
      P1=number1[adcdata1/1000];
      adcdata1%=1000;
      delay_2ms();

    four=1;
    three=0;
      P1=number[adcdata1/100];

      adcdata1%=100;
       delay_2ms();


     three=1;
     two=0;
        P1=number[adcdata1/10];


       delay_2ms();

     two=1;
     one=0   ;
     P1=number[adcdata1%10];
        delay_2ms();
     one=1;
  }

 //------------------------------------------
  void delay_2ms()
  { unsigned int i;
   for(i=0;i<111;i++);
  }
 //------------------------------------------
 unsigned int avedata()             //求平均

  {
   unsigned int i,j,max,min,sum=0,a,b,c,d,e,f,g,h;
   for(i=0;i<8;i++)
  { k=P0;

   a=(k&0x01)*128;
   b=(k&0x02)*32;
   c=(k&0x04)*8;
   d=(k&0x08)*2;
   e=(k&0x10)/2;
   f=(k&0x20)/8;
   g=(k&0x40)/32;
   h=(k&0x80)/128;
   adc0[i]=a+b+c+d+e+f+g+h;
 //adc0[i]=(k&0x01)*128+(k&0x02)*32+(k&0x04)*8+(k&0x08)*2+(k&0x10)/2+(k&0x20)/8+(k&0x40)/32+(k&0x80)/128;         //{ adc0[i]=P0; delay_2ms(); } ?            //放数据
   }

   for(i=0;i<7;i++)
    {
    if(adc0[i+1]>adc0[i])
        max=adc0[i+1];
    else max=adc0[i];
    }

    for(j=0;j<7;j++)
    {
    if(adc0[j+1]>adc0[j])
          min=adc0[j];
     else min=adc0[j+1];
    }

    for(i=0;i<8;i++)
    sum=sum+adc0[i];
   adcdata3=(sum-max-min)/6;

   return(adcdata3) ;
  }