27adc0809ad转换器基本应用技术.c

C51学习书

#include <reg51.h> 
//27．            ADC0809A/D转换器基本应用技术
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]={10,10,10,10,10,0,0,0}; 
unsigned char dispcount; 
  
sbit ST=P3^0; 
sbit OE=P3^1; 
sbit EOC=P3^2; 
unsigned char channel=0xbc;//IN3 
unsigned char getdata; 
  
void main(void) 
{ 
  TMOD=0x01; 
  TH0=(65536-4000)/256; 
  TL0=(65536-4000)%256; 
  TR0=1; 
  ET0=1; 
  EA=1; 
  
  P3=channel; 
  
  while(1) 
    { 
      ST=0; 
      ST=1; 
      ST=0; 
      while(EOC==0); 
      OE=1; 
      getdata=P0; 
      OE=0; 
      dispbuf[2]=getdata/100; 
      getdata=getdata%10; 
      dispbuf[1]=getdata/10; 
      dispbuf[0]=getdata%10; 
    } 
} 
  
void t0(void) interrupt 1 using 0 
{ 
  TH0=(65536-4000)/256; 
  TL0=(65536-4000)%256; 
  P1=dispcode[dispbuf[dispcount]]; 
  P2=dispbitcode[dispcount]; 
  dispcount++; 
  if(dispcount==8) 
    { 
      dispcount=0; 
    } 
}