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#include <REGX51.H>
#include "string.H" //for strcmp

#define keypad P1
#define LCD_dat P2

sbit rs =P3^0;
sbit en =P3^1;

sbit device =P3^2; // electric bilb

void dely(unsigned int dly);
void lcd_cmd(unsigned char ch);
void lcd_data(unsigned char ch);
void lcd_str(unsigned char *str);
char get_keypad_key(void);

void main(void)
{
char KeyVal =0;
unsigned int KeyCnt =0;
unsigned int CmpPassword =0;
char DefaultPassword[5]="6666";
char EnteredPassword[5];
device = 0;
lcd_cmd(0x38);
lcd_cmd(0x0C);
lcd_cmd(0x06);
lcd_cmd(0x01);

while(1)
{
lcd_cmd(0x80);
lcd_str("Enter Password: ");

KeyVal = get_keypad_key();

if(KeyVal != 0)
{
EnteredPassword[KeyCnt] = KeyVal;
lcd_cmd(0xc0+KeyCnt);
lcd_data('*');
KeyCnt = KeyCnt + 1;
}

if(KeyCnt == 4)
{
lcd_cmd(0x01);
KeyCnt =0; //6666
CmpPassword = strcmp(DefaultPassword,EnteredPassword);

if(CmpPassword == 0)
{
device = ~device; // switching on & off
lcd_cmd(0x80);
lcd_str("Correct Password");
dely(500);
}
else
{
lcd_cmd(0x80);
lcd_str("Wrong Password");

dely(500);
}
}
}
}

char get_keypad_key(void)
{
char key_val =0;
keypad = 0xFE; //ROW1 =0
if(keypad == 0xee) // button 1
{
key_val = '1';
}
if(keypad == 0xde) // button 2
{
key_val = '2';
}
if(keypad == 0xbe) // button 3
{
key_val = '3';
}

keypad = 0xFD; //ROW2 =0
if(keypad == 0xED) // button 4
{
key_val = '4';
}
if(keypad == 0xDD) // button 5
{
key_val = '5';
}
if(keypad == 0xBD) // button 6
{
key_val = '6';
}

keypad = 0xFB; //ROW3 =0
if(keypad == 0xEB) // button 7
{
key_val = '7';
}
if(keypad == 0xDB) // button 8
{
key_val = '8';
}
if(keypad == 0xBB) // button 9
{
key_val = '9';
}

keypad = 0xF7; //ROW3 =0
if(keypad == 0xE7) // button *
{
key_val = '*';
}
if(keypad == 0xD7) // button 0
{
key_val = '0';
}
if(keypad == 0xB7) // button #
{
key_val = '#';
}
return key_val;
}

void lcd_str(unsigned char *str)
{
unsigned int loop =0;
for(loop =0; str[loop]!= '\0'; loop++)
{
lcd_data(str[loop]);
}
}
void lcd_data(unsigned char ch)
{
LCD_dat = ch;
rs = 1; // data
en = 1;
dely(10);
en = 0;
}

void lcd_cmd(unsigned char ch)
{
LCD_dat = ch;
rs = 0; // cmd
en = 1;
dely(10);
en = 0;
}
void dely(unsigned int dly)
{
unsigned int loop =0;
unsigned int delay_gen =0;
for(loop =0; loop < dly; loop++)
for(delay_gen =0; delay_gen < 1000; delay_gen++); /* delay */
}