ad.c

PIC16F877应用的AD转换主程序 并可以通过LCD显示

//ad conversor

#include <pic.h>
const char table[]={0x3f,0x06,0x5b,0x4f,0x66, 
                      0x6d,0x7d,0x07,0x7f,0x6f};
const char table0[]={0xbf,0x86,0xdb,0xcf,0xe6, 
                      0xed,0xfd,0x87,0xff,0xef};
unsigned int adresult=0;
unsigned int ad_sample_result=0;
unsigned char ad_flag=0;
unsigned int ad_delay=0;

void initial()
{
   INTCON=0x00;
   ADCON1=0x07;
}

void ad_initial()
{    TRISA=TRISA|0x01;
     ADCON0=0x41;
     ADCON1=0x82;
     ADIF=0;
     ADIE=1;
     
}

void deal_ad()
{
   unsigned int temp;
   ad_sample_result=ADRESL+(ADRESH<<8);
   ad_flag=0;
   adresult=(ad_sample_result*50)>>10;
   temp=adresult;
   adresult=(((temp/10)<<4)&0xf0)+(adresult%10);
}

void interrupt ad()
{

   if(ADIF==1)
    { ADIF=0;
      ad_flag=1;
     }
}

void delay()
{
  int i;
  for(i=0;i<10;i++)
  i=i;
 }

void display()
{  
   unsigned char data,data0,data1,data2;
   data0=adresult&0x0f;
   data=table[data0];
   data1=(adresult&0xf0)>>4;
   data2=table0[data1];
   RB4=1;RB3=1;
   RB1=0;
   if(RB1==0)  {  PORTD=data;  delay();  PORTD=0x00;RB1=1; RB2=0; }
   if(RB2==0)  {  PORTD=data2; delay();  PORTD=0x00;RB2=1; }
 }

void main()
{ 
  TRISB=0x00;
  TRISD=0x00;
  initial();
  ad_initial();
  INTCON=0xc0;
  while(1)
 {
   display();
   if(ad_flag==1)
    deal_ad();
   if(ad_delay>0x0f)
  {
     ad_delay=0;
     ADCON0=ADCON0|0x04;
  }
  else ad_delay++;
 }
}