v_test.c

基于51设计的电压表

#include"regx52.h"
#include"absacc.h"

#define IN0 XBYTE[0x7ff8]
unsigned char dispbitcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char dispbuf[4]; //存放数码管显示数据
unsigned int i;
unsigned int j;
unsigned char getdata;  //存放读入数据
unsigned int temp;
unsigned char count;
sbit ad_busy = P3^2; //忙信号
sbit CLK = P3^5;  //时钟信号

void Delay(unsigned int i)//延时
{
  unsigned int j;
  for(;i>0;i--)
  {
  	for(j=0;j<125;j++)
  	{;}
  }
}

void Display()
{ 
	P1=dispbitcode[dispbuf[3]];
 	P3_0=0;
 	P3_1=1;
 	P3_3=1;
 	P3_4=1;
 	Delay(10);
 	P1=0x00;
	P1=dispbitcode[dispbuf[2]];
 	P1_7=1;//小数点
 	P3_0=1;
 	P3_1=0;
 	P3_3=1;
 	P3_4=1;
 	Delay(10); 
 	P1=0x00;
 	P1=dispbitcode[dispbuf[1]];
 	P3_0=1;
 	P3_1=1;
 	P3_3=0;
 	P3_4=1;
 	Delay(10);
 	P1=0x00;
 	P1=dispbitcode[dispbuf[0]];
 	P3_0=1;
 	P3_1=1;
 	P3_3=1;
 	P3_4=0;
	Delay(10);
 	P1=0x00;
}

void t1(void) interrupt 3 using 0 //CLOCK时钟信号
 {
  	TH1=(65536-200)/256;
  	TL1=(65536-200)%256;
  	CLK=~CLK;
  }

void TimeInitial()
{ 
	TMOD=0x10;//定时器工作在方式1
 	TH1=(65536-200)/256;
	TL1=(65536-200)%256; //频率500HZ
 	EA=1;
 	ET1=1;
	TR1=1;
}



void main()
{
	unsigned char p;
	unsigned char xdata *ad_adr;
	TimeInitial();
	ad_adr = &IN0;
	while(1){
		*ad_adr = 0;
		p=p;
		p=p;
		while(ad_busy==0);
		getdata = *ad_adr;
		temp=getdata*1.0/255*500;
		dispbuf[0] = temp%10;
		dispbuf[1] = temp/10%10;
		dispbuf[2] = temp/100%10;
		dispbuf[3] = temp/1000;
		Display();
	}

}