hi frnds gud discussion going

[vamshi]

hi frnds gud discussion going on

frnds i got a program of rfid system on which iam doing mini project

so frnds pls help in clearing my doubt…

frnds

> is the no. displayed on the tag v buy in rfid system is the only ID od that tag

> i think i hav a confined code which give access to only saperate TAG the program is shown below

 

#include<reg51.h>
sbit RS=P3^7;
sbit EN=P3^6;
sbit R=P3^2;    // for relay
sbit bz=P1^7;    // for piezo buzzer
void Rxmsg(void);
void lcdinit(void);
void lcdData(unsigned char l);
void lcdcmd(unsigned char k);
void DelayMs(unsigned int count);
void sucessRx(void);
void unknown(void);
void display(unsigned char s, t);
void welcome(void);
void main()
{
unsigned char i=0;
unsigned int j=0;
unsigned char c[15];
TMOD=0x20;    // Configure the serial port to 9600 baud rate
TH1=0xFD;
SCON=0X50;
TR1=1;
R=0;
lcdinit();
welcome();
bz=1;
while(1)
{
back:
for(i=0;i<15;i++)
// command to recv data
{
c=0xFF;
}
while(RI==0);
for(i=0;i<15;i++) //command to recv data
{
j=0;
while(RI==0)
{
if(j>=1000)
goto timeout;
j++;
}
c=SBUF;
RI=0;
}
timeout:
for(i=0;i<15;i++)
{
if(c==’1′ && c[i+1]==’E’ && c[i+2]==’0′ && c[i+3]==’0′ && c[i+4]==’7′ && c[i+5]==’C’ && c[i+6]==’A’ && c[i+7]==’0′ && c[i+8]==’3′ && c[i+9]==’C’)
//RFID code
{
sucessRx();
DelayMs(1000);
R=1;
bz=0;
DelayMs(1000);
R=0;
bz=1;
DelayMs(1000);
lcdinit();
DelayMs(100);
welcome();
goto back;
}
}
unknown();
DelayMs(2000);
bz=0;
DelayMs(2000);
bz=1;
DelayMs(1000);
lcdinit();
DelayMs(100);
welcome();
}
}
void sucessRx()
{
unsigned int i=0;
unsigned char c[]=”ACCESS GRANTED “;
lcdcmd(0x01);
DelayMs(10);
lcdcmd(0x80);
DelayMs(10);
while(c!=’’)
{
lcdData(c);
i++;
}
}
void unknown(void)
{
unsigned int i=0;
unsigned char c[]=”ACCESS DENIED”;
lcdcmd(0x80);
DelayMs(10);
while(c!=’’)
{
lcdData(c);
i++;
}
}
//

---

// Lcd intialization subroutine
//

---

void lcdinit(void)
{
lcdcmd(0x38);
DelayMs(250);
lcdcmd(0x0E);
DelayMs(250);
lcdcmd(0x01);
DelayMs(250);
lcdcmd(0x06);
DelayMs(250);
lcdcmd(0x80);
DelayMs(250);
}
//

---

// Lcd data display
//

---

void lcdData(unsigned char l)
{
P2=1;
RS=1;
EN=1;
DelayMs(1);
EN=0;
return;
}
//

---

// lcd command
//

---

void lcdcmd(unsigned char k)
{
P2=k;
RS=0;
EN=1;
DelayMs(1);
EN=0;
return;
}
//

---

// Delay mS function
//

---

void DelayMs(unsigned int count)
{  // mSec DelayMs 11.0592 Mhz
    unsigned int i;
//  Keil v7.5a
while(count){
i=115;   // 115 exact value
while(i>0)
i–;
count–;
}
}
void welcome(void)
{
unsigned int i=0;
unsigned char c[]=”WELCOME TO RFID”;
unsigned char d[]=”SECURITY SYSTEM”;
lcdcmd(0x01);
DelayMs(10);
lcdcmd(0x80);
DelayMs(10);
while(c!=’’)
{
lcdData(c);
i++;
}
lcdcmd(0xc0);
i=0;
while(d!=’’)
{
lcdData(d);
i++;
}
}

 

>frnds please xplain me this working

i think this code isconfined to tag no. “1E007CA03C”

frnds help me to re design the prgrm so it can access my system