RFID interfacing with pic

[Gaurangi]

I got rfid reader i.e.vai-27 & tags. I used the program given in topic “rfid interfacing with pic18f4550”..but tag no. is not being displayed on lcd. plz help me out asap..

[AJISH ALFRED]

Have you done the following ??

Connect your rfid reader to the serial port of computer and check wheather you are getting the tag no. properly in the hyperterminal while swapping the tag.

[aniruddha]

the above rfid interfacing to pic18f4550 code is not working …please suggest the right code as fast u can 

 

 

 

 

 

 

#include <p18f4550.h>

/*The following lines of code perform interrupt vector relocation to work with the USB bootloader. These must be used with every application program to run as a USB application.*/

 

#pragma code

 

#pragma code _HIGH_INTERRUPT_VECTOR = 0x000808

void _high_ISR (void)

{

    _asm goto change _endasm

}

#pragma code _LOW_INTERRUPT_VECTOR = 0x000818

void _low_ISR (void)

{

     ;

}

#pragma code

 

void change(void)

{

 

INTCON3bits.INT1IF = 0;

}

#define FREQ 12000000

#define baud 9600

#define spbrg_value (((FREQ/64)/baud)-1)

#define rs PORTAbits.RA0

#define rw PORTAbits.RA1

#define en PORTAbits.RA2

#define lcdport LATB

 

unsigned char rx_data();

void lcd_ini(void);

void lcdcmd(unsigned char);

void lcddata(unsigned char);

void MsDelay(unsigned int delay); 

unsigned char data[] =”unique ID No.”;

unsigned char card_id[12];

unsigned int i=0,pos;

void main()

 

{

TRISB=0; // set port B as output port 

LATB=0;

TRISA=0;

LATA=0;

SPBRG=spbrg_value; // fill SPBRG reg to set the baud rate 

RCSTAbits.SPEN=1;  // to activate serial port (Tx and Rx pins)

RCSTAbits.CREN=1;   // to enable continuous reception 

PIE1bits.RCIE=1; // to enable the reception (RX)interrupt

INTCONbits.GIE=1;

INTCONbits.PEIE=1;

lcd_ini();      // lcd initialization 

while(data!=’’)

{

lcddata(data);  // to send characters one by one from data array

i++;

}

while(1)

{

i=0;

while(i<12);

lcdcmd(0xc0);

i=0;

while(i<12)

{

lcddata(card_id); // print the 12 byte receiverd data 

i++;

}

   }

}

void interrupt()

{

card_id=RCREG;  // store the receicer data byte by byte 

i++;

}

void lcd_ini()

{

lcdcmd(0x38); // configure th lcd in 8 bit mode 

lcdcmd(0x0c); // display on and cursor off

lcdcmd(0x01);// clear displayscreen 

lcdcmd(0x06);//increment cursor 

lcdcmd(0x80);//set cursor position to 1st line 1st coloum

}

void lcdcmd(unsigned char cmdout)

{

lcdport= cmdout;// send command to lcdport=PORTB

rs=0;

rw=0;

en=1;

MsDelay(10);

en=0;

}

void lcddata(unsigned char dataout)

{

lcdport=dataout;// send data to lcdport =PORTB

rs=1;

rw=0;

en=1;

MsDelay(10);

en=0;

}

void MsDelay(unsigned int time)

{

unsigned int i,j;

for(i=0;i<time;i++)

   for(j=0;j<710;j++);

}

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