microcontroller code error in C

[mentoz]

i little bit confuse with my problem, because the microcontroller is went wrong but in proteus everything is alright. is there someone check for this C code? especially inside main body and while 1, because the time cannot be decrease less than three seconds. let me know if ther is something I should revised.

#include<stdio.h>
#include<reg52.h>										   

#define port P3
#define dataport P2
#define key P1

//sfr Port0=0x80;

sbit rs=port^7;
sbit rw=port^5;
sbit en=port^6;

sbit col1=key^4;
sbit col2=key^5;
sbit col3=key^6;
sbit row1=key^0;
sbit row2=key^1;
sbit row3=key^2;
sbit row4=key^3;
sbit out=port^0;
sbit pir1=port^2;
sbit pir2=port^3;
sbit lampsig=P0^3;

static unsigned int time;
static unsigned int count;
static unsigned timer;
//static unsigned int bcounter=1;
unsigned char digit[3]={0,0,0};

int i,k;

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

void lcd_cmd(unsigned char item) // Function to send command to LCD
{
dataport = item;
rs= 0;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data(unsigned char item) // Function to send data to LCD
{
dataport = item;
rs= 1;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data_string(unsigned char *str) // Function to send data to string
{
while(*str)
{
  lcd_data(*str++);
  delay(1);
}
return;
}

void lcd(unsigned char str[10])
{
lcd_cmd(0x38);
lcd_cmd(0x0e);
lcd_data_string(str);
}

void lcd_data_int(int time_val)			// Function to send three digit number
{
	int int_amt;
	int_amt = time_val/100;
	lcd_data(int_amt+48);
	time_val = time_val%100;
	int_amt = time_val/10;
	lcd_data(int_amt+48);
	int_amt = time_val%10;	 
	lcd_data(int_amt+48);
}

void digit_set(char num)			
{
	if(count==3)
	{
		lcd_cmd(0x01);
		lcd_cmd(0x83);
		lcd_data_string("INPUT DONE!");
		lcd_cmd(0xc0);
		lcd_data_int(time);
		lcd_cmd(0xc3);
		lcd_data_string("second");
		lcd_cmd(0x08);
	}
	else
	{
		if(count==0)
			{
			digit[2]=num;
			//digit[1]=gak ada
			//digit[0]=gak ada
			}
		else
			if(count==1)
			{
				//digit[2]=digit[2];
				digit[1]=num;
				//digit[0]=gak ada 
			}
			else
				if(count==2)
				{
					//digit[2]=digit[2];
					//digit[1]=digit[1];
					digit[0]=num;
				}
		lcd_data((num+48));
	}
}

void check_col1()		 // Col1 check
{
	row1=row2=row3=row4=1;
	row1=0;
	if(col1==0)				 	// Key 1
	{  
		delay(10);
		digit_set(1);
	}
	row1=1;
	row2=0;
	if(col1==0)					// Key 4
	{
		delay(10);
		digit_set(4);
	}
	row2=1;
	row3=0;
	if(col1==0)			  		// Key 7
	{ 
		delay(10);
		digit_set(7);
	}
	row3=1;
	row4=0;
	if(col1==0)					// Key *
	{ 
		delay(10);
		if(count==4)
		{
			digit_set(10);
		}
		else
		{
			count=4;
			digit_set(10);
		}
	}
	row4=1;
}

void check_col2()     //Col2 check
{
	row1=row2=row3=row4=1;
	row1=0;
	if(col2==0)					// Key 2
	{
		delay(10);
		digit_set(2);
	}
	row1=1;
	row2=0;
	if(col2==0)			 		// Key 5
	{
		delay(10);
		digit_set(5);
	}
	row2=1;
	row3=0;
	if(col2==0)	       				// Key 8
	{
		delay(10);
		digit_set(8);
	}
	row3=1;
	row4=0;
	if(col2==0)		 			// Key 0
	{
		delay(10);
		digit_set(0);
	}
	row4=1;
}

void check_col3()	 // Col3 check
{
	row1=row2=row3=row4=1;
	row1=0;
	if(col3==0)					// Key 3
	{
		delay(10);
		digit_set(3);
	}
	row1=1;
	row2=0;
	if(col3==0)			   		// Key 6
	{
		delay(10);
		digit_set(6);
	}
	row2=1;
	row3=0;
	if(col3==0)				  	// Key 9
	{
		delay(10);
		digit_set(9);
	}
	row3=1;
	row4=0;
	if(col3==0)					// Key #
	{
		delay(1);
	}
	row4=1;
}

void keypad()
{ 
  row1=row2=row3=row4=0;
  while(col1==1 && col2==1 && col3==1);
  for(i=0;i<3;i++)
  {
   delay(100);
   lcd_cmd(0x0F);
   lcd_cmd(0xc6+i);
   row1=row2=row3=row4=0;
   while(col1==1 && col2==1 && col3==1);
   row1=row2=row3=row4=0;
	if(col1==0)
		check_col1();
	else
		if(col2==0)
			check_col2();
		else
			if(col3==0)
				check_col3();
	delay(50);
}
}
void main()
{
out=0;
pir1=0;
pir2=0;
lampsig=1;

TMOD=0x01;
EA=0;
TH0=29300/256;TL0=29300%256;   //19456(4c00)
ET0=1;
EX0=0;
IT0=0;
PX0=0;
TF0=0;	
EA=1;

count=0;			//initial count value

 lcd_cmd(0x38);
 delay(2); 
 lcd_cmd(0x01);  // Clear Screen
 lcd_cmd(0x84);
 lcd_cmd(0x1c);
 lcd("WELCOME");
 delay(20000);

	lcd_cmd(0x01);
	lcd_cmd(0x80);
	lcd("Enter time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("nter time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("ter time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("er time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("r time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd(" time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("time interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("ime interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("me interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("e interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd(" interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("interval(second):");
	lcd_cmd(0x80);
	delay(10);
	lcd("nterval(second):");
	lcd_cmd(0x80);
	delay(10);
while(count<4)
{					
		
		delay(50);
		keypad();
		time=(digit[0]+(digit[1]*10)+(digit[2]*100));
		count++;		
		delay(1);
}

lcd_cmd(0x01);
	lcd_cmd(0x82);
	lcd("DEVICE READY");
	delay(50000);
lcd_cmd(0x01);
	lcd_cmd(0x82);
	lcd("TIME DISPLAY");
	
while(1)
{
   lcd_cmd(0xc6);
   lcd_data_int(time);

if(pir1==1 && pir2==1)
  out=1;
if(pir1==1 && pir2==0)
  out=1;
if(pir1==0 && pir2==1)
  out=1;

if(pir1||pir2==1)
{ 
TR0=1;
}			

while(lampsig==0 && (pir1||pir2)==1)
{
time=(digit[0]+(digit[1]*10)+(digit[2]*100));
}
						 
if(time==0)
	{
	out=0;
	TR0=0;
	}		
}
}

void isr_t0()interrupt 1 using 2
{
 TR0=0;
 TF0=0;
 TH0=29300/256;TL0=29300%256;
 if(++timer==20)
 {--time;//bcounter^=1;
  timer=0;
   }
  //if(++timer1==5){(bcounter^=1);timer1=0;}
 TR0=1;
 }

thank you

 

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