Security Door project Program for 8051

#include<reg51.h>
#include"lcd_display.h"

void column1();
void column2();
void column3();
void resetPassword();
void getNewPassword();
char getkey();

sbit c1=P0^0;
sbit c2=P0^1;
sbit c3=P0^2;
sbit r1=P0^3;
sbit r2=P0^4;
sbit r3=P0^5;
sbit r4=P0^6;
sbit reset_password=P1^2;
sbit ON=P1^3;

char reset_code[3]={'9','9','9'},password[6];

int i=0,count=0,danger=0;
int col,row;
char num[4][3]={{'1','2','3'},
                {'4','5','6'},
       {'7','8','9'},
       {'*','0','#'}};

void main()
{
  char c;
  c1=c2=c2=1;
  r1=r2=r3=r4=0;
  reset_password=ON=1;
  rs=en=0;
  P2=0x00;
  TMOD=0x01;
  lcd_init();
 
  while(1)
  { 
     while(!reset_password) // loop for resetting the password
  {       //if owner enters an correct ID 
     lcd_cmd(0x01);
     lcd_dataS("Welcome Owner");
  lcd_cmd(0xc0);
  lcd_dataS("enter ID-");
  count=0;

  for(i=0;i<3;i++)  //i<3 because reset_code is only 3characters
  {
    while(c1==1 && c2==1 && c3==1); //wait for the key to be pressed
    c=getkey();
    lcd_data(c);
    if(c==reset_code[i]) count++; //count everytime entered key matches
  }                            //with stored key

  if(count==3)   //if enters correctly COUNT will be 3
  {
    lcd_cmd(0x01);
    resetPassword();
    lcd_dataS("Password resetd");
    getNewPassword();
  }
  else
  { 
    lcd_cmd(0x01);
    lcd_dataS("wrong code");
  }
  }     //end of first while

     
  while(!ON)
  {
    lcd_cmd(0x01);
    lcd_dataS("welcome");
    lcd_cmd(0xc0);
    lcd_dataS("enter P-");
    count=0;

    for(i=0;i<6;i++)   //i<6 because password is 6 characters wide
     {
    while(c1==1 && c2==1 && c3==1);
    c=getkey();
    lcd_data(c);
       if(c==password[i])    
     count++;  //count everytime entered key matches 
  }

    if(count==6)   //count will be 6 if entered password is correct
     {
       lcd_cmd(0x01);
       lcd_dataS("welcome Boss");
       lcd_cmd(0xc0);
       lcd_dataS("Doors Opened");
    count=0;
    delay(10);
     }
    else
    {
     danger++;  //everytime password is entered worng increment 'danger'     
  lcd_cmd(0x01);
  lcd_dataS("wrong Password");
    }
    if (danger==4) //if danger count reaches 4
    {     //here i just displayed the INTRUDER msg on the lcd
                      //here you can send a msg to owner by interfacing gsm
       //or you can sound an buzzer 
    lcd_cmd(0x01);
    lcd_dataS("intruder intruder");
    danger=0;
    delay(10);
    }
     } //end of second while loop
   }   //end of superloop
}  //end of main

void getNewPassword()
{
 i=0;
 lcd_cmd(0x01);
 lcd_dataS("enter New paswrd");
 lcd_cmd(0xc0);

  for(i=0;i<6;i++)
   {
     while(c1==1 && c2==1 && c3==1); 
     password[i]=getkey();
  lcd_data(password[i]);
   }
 
 lcd_cmd(0x01);
 lcd_dataS("password changed");
 lcd_cmd(0xc0);
 lcd_dataS("successfully");  
}

void resetPassword()
{
int j;
for(j=0;j<6;j++)
password[j]='\0';
}

char getkey()
{
  
  if(c1==0 || c2==0 || c3==0)
  {
    if(c1==0)
 {
   column1();
   while(!c1);
   col=0;
 }
    if(c2==0)
 {
  column2();
   while(!c2);
   col=1;
 }
    if(c3==0)
 {
     column3();
   while(!c3);
   col=2;
 }
  }

  return num[row][col];
}

void column1()
{

 r1=r2=r3=r4=1;

 r1=0;
 if(c1==0)
 row=0;

 r1=1;r2=0;
 if(c1==0)
 row=1;

 r1=1;r2=1;r3=0;
 if(c1==0)
 row=2;

 r1=1;r2=1;r3=1;r4=0;
 if(c1==0)
 row=3;
 
 r1=r2=r3=r4=0;

}


void column2()
{

 r1=r2=r3=r4=1;

 r1=0;
 if(c2==0)
 row=0;

 r1=1;r2=0;
 if(c2==0)
 row=1;

 r1=1;r2=1;r3=0;
 if(c2==0)
 row=2;

 r1=1;r2=1;r3=1;r4=0;
 if(c2==0)
 row=3;
 
 r1=r2=r3=r4=0;
 
}


void column3()
{

 r1=r2=r3=r4=1;

 r1=0;
 if(c3==0)
 row=0;

 r1=1;r2=0;
 if(c3==0)
 row=1;

 r1=1;r2=1;r3=0;
 if(c3==0)
 row=2;

 r1=1;r2=1;r3=1;r4=0;
 if(c3==0)
 row=3;
 
 r1=r2=r3=r4=0;

}