ad及液晶显示.c

文件是用C51编写的

#include<AT89X51.H>
#include<LCD1602.H>

void delay(unsigned int count);
unsigned char adr(bit n);
sbit oe=P3^0;
sbit eoc=P3^1;
sbit start=P3^2;
sbit adda=P3^3;

unsigned char tc,ds=0x04;
bit flag=0;
unsigned char k=196;
unsigned int a0,a1;


void main()
{
	TMOD=0x01;
	TH0=0x4c;
	TH0=0x00;
	IE=0x82;
	tc=ds;
	TR0=1;
	do
	{
		if(flag==1)
		{
			flag=0;
			a0=adr(0)*k;
			a1=adr(1)*k;
			LCD_initial();
			LCD_set_position(0);
			LCD_prints("U0=");
			LCD_printc(0x30+a0/10000);
			LCD_printc(0x2e);
			LCD_printc(0x30+a0%10000/1000);
			LCD_printc(0x30+a0%1000/100);
			LCD_printc(0x30+a0%100/10);
			LCD_printc(0x30+a0%10);
			LCD_set_position(0x40);
			LCD_prints("U1=");
			LCD_printc(0x30+a1/10000);
			LCD_printc(0x2e);
			LCD_printc(0x30+a1%10000/1000);
			LCD_printc(0x30+a1%1000/100);
			LCD_printc(0x30+a1%100/10);
			LCD_printc(0x30+a1%10);
		}
	}while(1);
}


void time0(void) interrupt 1 using 1
{
	TH0=0x4c;
	tc--;
	if(tc==0)
		{
			tc=ds;
			flag=1;
		}
}


unsigned char adr(bit n)
{
	unsigned char ads;
	oe=0;
	start=0;
	adda=n;
	start=1;
	start=0;
	do
	{
	}while(eoc==0);
	oe=1;
	ads=P0;
	oe=0;
	return(ads);
	
}