Password Based Locking System

            /* Timer header file*/

void timemdel(unsigned int con)
{
T0CTCR=0X0;
T0PR=59999;
T0MR0=con;
T0MCR|=1<<2;
T0TCR=0X02;
T0TCR=0X01;
while(T0TC!=T0MR0);
T0TC=0;
T0TCR=0;
}
void timeudel(unsigned int con)
{
T1CTCR=0X0;
T1PR=59;
T1MR0=con;
T1MCR|=1<<2;
T1TCR=0X02;
T1TCR=0X01;
while(T1TC!=T1MR0);
T1TC=0;
T1TCR=0;
}
                             /*lcd header file*/
#define RS (1<<16)
#define E (1<<17)
#define D4 (1<<10)
#define D5 (1<<11)
#define D6 (1<<12)
#define D7 (1<<13)
//void delay(void);
void lcd_init(void);
void lcd_cmd(int );
void lcd_string(char *str);
void lcd_conv(char );
void lcd_cmd(int cmd)
{
IOCLR0|=RS;
lcd_conv(cmd);
IOCLR0|=RS;
timeudel(1000);
}
void lcd_init(void)
{
IODIR0|=D4|D5|D6|D7;
IODIR0|=RS|E;
IOCLR0|=D4|D5|D6|D7;
IOCLR0|=RS|E;
lcd_cmd(0x02);
lcd_cmd(0x28);
lcd_cmd(0x0E);
lcd_cmd(0x01);
lcd_cmd(0x06);
}
void lcd_string(char *str)
{
while(*str!=0)
{
IOSET0|=RS;
lcd_conv(*str);
str++;
}
timeudel(1000);
}
void lcd_conv(char data)
{
int recv;
IOCLR0|=D4|D5|D6|D7;
recv=data>>4;
IOSET0=recv<<10;
IOSET0|=E;
timeudel(1000);
IOCLR0|=E;
timeudel(1000);
IOCLR0|=D4|D5|D6|D7;
recv=data;
IOSET0|=(recv<<10);
IOSET0|=E;
timeudel(1000);
IOCLR0|=E;
IOCLR0|=D4|D5|D6|D7;
}

                   /*Key pad Header file*/

#define c1 (1<<20)

#define c2 (1<<21)

#define c3 (1<<22)

#define r1 (1<<16)

#define r2 (1<<17)

#define r3 (1<<18)

#define r4 (1<<19)

char get_key(void)

{

IO1DIR=0x0f<<16;

  IO1CLR|=0xFF<<16;

IO1SET|=0xFF<<16;

while(1)

{

  IO1CLR|=r1;

IO1SET|=0x0E<16;

  if((IO1PIN&c1)==0)

  {

    while((IO1PIN&c1)==0);

return '1';

  }

  else if((IO1PIN&c2)==0)

  {

    while((IO1PIN&c2)==0);

return '2';

  }

  else if((IO1PIN&c3)==0)

  {

    while((IO1PIN&c3)==0);

return '3';

  }

   IO1CLR|=r2;

IO1SET|=0x0D<<16;

   if((IO1PIN&c1)==0)

  {

    while((IO1PIN&c1)==0);

return '4';

  }

else if((IO1PIN&c2)==0)

  {

    while((IO1PIN&c2)==0);

return '5';

  }

else if((IO1PIN&c3)==0)

  {

    while((IO1PIN&c3)==0);

return '6';

  }

  IO1CLR|=r3;

IO1SET|=0X0B<<16;

   if((IO1PIN&c1)==0)

  {

    while((IO1PIN&c1)==0);

return '7';

  }

else if((IO1PIN&c2)==0)

  {

    while((IO1PIN&c2)==0);

return '8';

  }

else if((IO1PIN&c3)==0)

  {

    while((IO1PIN&c3)==0);

return '9';

  }

IO1CLR|=r4;

  IO1SET|=0X07<<16;

     if((IO1PIN&c1)==0)

  {

    while((IO1PIN&c1)==0);

return '*';

  }

else if((IO1PIN&c2)==0)

  {

    while((IO1PIN&c2)==0);

return '0';

  }

else if((IO1PIN&c3)==0)

  {

    while((IO1PIN&c3)==0);

return '#';

  }

}

}

                      /*Main program*/

#include<lpc214x.h>

#include<string.h>

#include"timerdelay.h"

#include"lcd.h"

#include"keypad.h"

#define bit(x) (1<<x)

char flag=0;

char pwd[]="3333";

void lock(void);

int main(void)

{

char key[5];

int con=0;

lcd_init();

lcd_cmd(0x01);

lcd_string("press 1 to cha-");

lcd_cmd(0x01);

lcd_string("nge password");

flag=get_key();

if(flag=='1')

{

lcd_cmd(0x01);

lcd_string("New pwd : ");

for(con=0;con<4;con++){

pwd[con]=get_key();

lcd_string("*");}

     pwd[con]=0;

   }

while(1){

lcd_cmd(0x01);

lcd_string("password:");

//lcd_cmd(0xc0);

for(con=0;con<4;con++){

key[con]=get_key();

lcd_string("*");}

key[con]=0;

  if(strcmp(key,pwd)!=0)

  {

lcd_cmd(0x20);

    lcd_cmd(0x01);

lcd_string("Wrong password");

}

else {

lock();

}

}

}

void lock(void)

{

IO0DIR|=bit(19)|bit(20);

lcd_cmd(0x01);

lcd_string("lock is opening");

IO0SET|=bit(19);

timemdel(50);

IO0CLR|=bit(19);

timemdel(100);

lcd_cmd(0x01);

lcd_string("lock is closing");

IO0SET|=bit(20);

timemdel(50);

IO0CLR|=bit(20);

}

NOTE: Save header files as <filename>.h in a folder and include that folder in target options>c/c++>include paths

        

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