ADC0804 and 8051 interfacing problem!

[hashim5003]

I was using adc0831 and lm35 with at89s52. Now I am using adc0804 instead. I have written the code, it simulates on proteus but not running on the hardware. I am posting the code I have written. Plz mention if there is any problem.
Problem:
when I use while (intr == 1) lcd only shows black boxes. and without this statement all it shows "temp:000"

#include<reg52.h>

#define adc_input P2
#define lcd_data P1

void delay (int);
void lcdcmd (char);
void lcddata (char);
void lcd_init(void);

sbit r = P3^1;
sbit w = P3^2;
sbit rs = P3^7;
sbit rw = P3^6;
sbit e = P3^5;
sbit intr = P3^3;

void main()
{	
	signed char x, a, b, c;
	while (1)
	{
		r = 1;
		w = 0;
		delay (1);
		w = 1;
		while (intr == 1);
		r = 0;
	
		lcd_init();
	
		lcddata ('t');
		lcddata ('e');
		lcddata ('m');
		lcddata ('p');
		lcddata (':');
	
		x = adc_input / 10;
		a = x / 10;
		b = x % 10;
		c = adc_input % 10;
	
		lcddata ( a + 0x30 );
		lcddata ( b + 0x30 );
		lcddata ( c + 0x30 );
	}
}

void delay( int a )  
{
	int i,j ;
	for(i=0;i<a;i++)
		for(j=0; j<1275; j++);
}

void lcdcmd (char value)
{
	rs=0;
	lcd_data = value;
	rw=0;
	e=1;
	delay (1);
	e=0;

}

void lcd_init(void)
{
   lcdcmd(0x38);    
   lcdcmd(0x0c);    
   lcdcmd(0x06);
   lcdcmd(0x80);    
}
	

void lcddata (char value)
{
	rs=1;
	lcd_data = value;
	rw=0;
	e=1;
	delay (1);
	e=0;

}

 

[hashim5003]

anyone here?