dy.c

基于单片机的数字电压表, 采用AD转换器。三位显示断码

#include<reg51.h>
#define uchar unsigned char
#define IN P1
uchar datax[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x3f};
uchar disp[]={0,0,0,0};
sbit EOC=P3^1;
sbit ADDA=P3^4;
sbit ADDB=P3^5;
sbit ADDC=P3^6;
sbit OE=P3^0;
sbit ST=P3^2;
void delay(uchar q)
{   uchar i;
for(;q!=0;q--)
    for(i=250;i>0;i--);
}
/*******************/
void display()
{
	uchar i,k=0x01;
	for(i=0;i<4;i++)
	{
		P2=0xff;//关闭显示
		P0=datax[disp[i]];
		P2=~k;
		delay(1);
		k<<=1;
	}
	P2=0xff;//关闭显示
}
/*************************/
uchar ADC0808()
{
	uchar d;
	ADDA=0;
	ADDB=1;
	ADDC=0;
	delay(1);ST=1;delay(2);ST=0;
	while(EOC==0);
	OE=1;
	d=P1;
	OE=0;
	return d;
}
/***************************/
void covert(uchar x)
{	 
	disp[2]=x/50;
	x=(x%50);
	disp[0]=x/10;
	disp[1]=x%10;
}
/*************************/
void main(void)
{  
   unsigned s;
   OE=0;
   ST=0;
   EOC=1;
	while(1)
	{
	  covert(ADC0808());
	  for(s=0;s<2;s++)
	  {
	  display();
	   }
	}	 
}
/************************/