adc0809电压信号采集.c

献给初学单片机的爱好者们

#include <AT89X52.H>  
unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};  
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};  
unsigned char dispbuf[8]={10,10,10,10,0,0,0,0};  
unsigned char dispcount;  
unsigned char getdata;  
unsigned int Vol;  
unsigned char i;  
sbit ST=P3^0;  
sbit OE=P3^1;  
sbit EOC=P3^2;  
sbit CLK=P3^3;  
   
void main(void)  
{ unsigned char i; 
  ST=0;  		//初始化ADC0809
  OE=0;  
  ET0=1;  
  ET1=1;  
  EA=1;  
  TMOD=0x12;  
  TH0=216;  
  TL0=216;  
  TH1=(65536-4000)/256;  
  TL1=(65536-4000)%256;  
  TR1=1;  
  TR0=1;  
  ST=1;  
  for(i=0;i<100;i++)
  {}
  ST=0;  //开始转换
  while(1)  
    {  
      if(EOC==1)  
        {  
          OE=1;  
          getdata=P0;  
          OE=0;  
          Vol=getdata*2*98/100;  
           i=5;  
          dispbuf[0]=10;  
          dispbuf[1]=10;  
          dispbuf[2]=10;  
          dispbuf[3]=10;  
          dispbuf[4]=10;  
          dispbuf[5]=0;  
          dispbuf[6]=0;  
          dispbuf[7]=0;  
          while(Vol/10)  
            {  
              dispbuf[i]=Vol%10;  
              Vol=Vol/10;  
              i++;  
            }  
          dispbuf[i]=Vol;           
          ST=1;  
          ST=0;  
        }  
    }  
}  
   
void t0(void) interrupt 1 using 0  
{                           
  CLK=~CLK;                         //产生信号频率
}  
   
void t1(void) interrupt 3 using 0  
{  
  TH1=(65536-4000)/256;  
  TL1=(65536-4000)%256;  
  P1=dispcode[dispbuf[dispcount]];  
  P2=dispbitcode[dispcount];  
  if(dispcount==7)  
    {  
      P1=P1 | 0x80;  
    }  
  dispcount++;  
  if(dispcount==8)  
    {  
      dispcount=0;  
    }   
}