about rfid tag no

[ajay]

thank you dagakshay sir for your help .

 

i am working with your ref isr.

 

i want to know about rfid tag no.

 

i have three tag

 

3E009341E60A card 1

3E0093521CE3 card 2

3E0093491BFF card3

 

these are ascii values seen on realterm

 

their hex valuies are

 

03 33 45 30 30 39 33 34 31 45 36 30 41 0A 0D  card 1

 

03 33 45 30 30 39 33 35 32 31 43 45 33 0A 0D  card 2

 

03 33 45 30 30 39 33 34 39 31 42 46 46 0A 0D  card 3

 

now can you tell me  please about start bit stop bit & how much should be my array size and which element i should copare if i want to conpare A or F or 3 i.e. last charactor of tag no.

i have modified code as follows.

 

thanks again;   

 

//Program to receive a 12 byte string from RFID and display it on LCD using serial interrupt

 
#define F_CPU 16000000UL
 
#include<avr/io.h>
#include<util/delay.h>
#include<avr/interrupt.h>
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) – 1)
#define  LED PORTA
#define  LED0 PA0;                         
#define  LED1 PA1;
#define  LED2 PA2;
#define unsigned char mybyte[14], i=0;

void usart_init()
    {
         UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN);         // Turn on the transmission and..

                                                                                                            // reception circuitry

        UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);    // Use 8-bit character sizes

        UBRRL = BAUD_PRESCALE;                                     // Load lower 8-bits of the baud rate value..
    
                                                                // into the low byte of the UBRR register
        UBRRH = (BAUD_PRESCALE >> ;                             // Load upper 8-bits of the baud rate value..

       
                                                                // into the high byte of the UBRR register
    }
 
 
int main(void)
    {
       
       
        DDRA=0xff;                             // LED_DATA port as output port
        cli();   
        usart_init();
        _delay_ms(50);                // delay of 50 mili seconds
        sei();
        while(1);
        return 0;
    }
 

 ISR (USART_RXC_vect)
    {
       
                               
           
            for(i=0;i<=13;i++)                   
            {
                mybyte=UDR;
            }   
            if(mybyte[1]= = ‘A’)

                   LED=(1<<LED0);

               if(mybyte[1]= =’F’)

                   LED=(1<<LED1);

               if(mybyte[1]= = ‘3’)

                   LED=(1<<LED3);

                   _delay_ms(1000);

              LED=0;
    }