rfid

i did the same way, but i dont know whats wrong in my code!!!


#define F_CPU 12000000UL

#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
#define LCD_DATA PORTC


#include<avr/io.h>
#include<util/delay.h>
#include "lcd_lib.h"


void usart_init();
unsigned int usart_getch();

unsigned char i,j, card[13];
void getcard_id(void);


int main(void)
{
            //LCD_DATA port as output port
    DDRC=0xFF;
    DDRA=0x07;
    usart_init();   // initiailztion of USART

    i=j;
     LCDinit(); // initialization of LCD
     _delay_ms(100); // delay of 50 milli seconds
     LCDclr();
    while(1)
   {
     getcard_id();
    if(card[0]==2)
    {
     LCDGotoXY(0,1);
     LCDdisplay(card);
     _delay_ms(500);
     }
     return 0;
   }
}

void getcard_id(void)   //Function to get 12 byte ID no. from rfid card
{
    for(i=0;i<12;i++)
    {
        card[i]= usart_getch(); // receive card value byte by byte
         PORTA|=(1<<0);

         PORTA^=(1<<0);
         _delay_ms(100);

         PORTA^=(1<<0);
         _delay_ms(100);

         PORTA^=(1<<0);
         _delay_ms(100);

    }

    return;
}




void usart_init()
{
    UCSRB |= (1 << RXEN) | (1 << TXEN);   // Turn on the transmission and reception circuitry
    UCSRC |= (1 << URSEL) | (1<<USBS) | (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 >> 8); // Load upper 8-bits of the baud rate value..
                                  // into the high byte of the UBRR register
}

unsigned int usart_getch()
{
    while ((UCSRA & (1 << RXC)) == 0); // Do nothing until data have been received..
                       // and is ready to be read from UDR
    return(UDR); // return the byte


}