Bluetooth_interfacing_ATmega32

#define F_CPU 1000000UL // 1MHz clock speed
                   /* Define CPU clock Frequency e.g. here its 8MHz */
#include <avr/io.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <util/delay.h>                     /* Include AVR std. library file */
#include <avr/interrupt.h>

#define BAUD_PRESCALE ((F_CPU / (BAUDRATE * 16UL)) - 1)   /* Define prescale value */

void USART_Init(unsigned long BAUDRATE)             /* USART initialize function */
{
	UCSRA = 0b00000000;
	//UCSRB |= (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);              /* Enable USART transmitter and receiver and Interrupt */
	UCSRB |= (1 << RXEN) | (1 << TXEN) ;              /* Enable USART transmitter and receiver */

	UCSRC |= (1 << URSEL)| (1 << UCSZ0) | (1 << UCSZ1); /* Write USCRC for 8 bit data and 1 stop bit */

	UBRRL = BAUD_PRESCALE;                          /* Load UBRRL with lower 8 bit of prescale value */
	UBRRH = (BAUD_PRESCALE >> 8);                   /* Load UBRRH with upper 8 bit of prescale value */

	//UBRRL = 0;
	//UBRRH = 12; // Assuming 1 Mhz Clock
}

void UART_init(){
	UCSRA = 0x02 ;
	UCSRB = 0x18 ;
	UCSRC = 0x86 ;
	UBRRL = 12 ;
	UBRRH = 0 ;
}

void UART_send(unsigned char data){
	while((UCSRA&(1<<UDRE))==0) ;
	UDR = data ;
}


char USART_RxChar()                                 /* Data receiving function */
{
	while (!(UCSRA & (1 << RXC)));                  /* Wait until new data receive */
	return(UDR);                                    /* Get and return received data */
}

void USART_TxChar(char data)                        /* Data transmitting function */
{
	UDR = data;                                     /* Write data to be transmitting in UDR */
	while (!(UCSRA & (1<<UDRE)));                   /* Wait until data transmit and buffer get empty */
}


int main(void)
{
    DDRA = 0xFF;
    PORTA |= (1<<PORTA7);
//    USART_Init(9600);                /* initialize USART with 9600 baud rate */
    //sei();
    UART_init() ;

	unsigned char data ;

    while (1)
    {
		//data = USART_RxChar();

		while((UCSRA&(1<<RXC))==0) ;
		data = UDR ;
		if(data=='1'){
			PORTA |= (1<<PORTA0);
			UART_send(data) ;
		}
		else if(data=='0'){
			PORTA |= (1<<PORTA1);
			UART_send(data) ;
		}
		else{
			UART_send(data) ;
		}

		PORTA = data;

		//_delay_ms(1000);

		//PORTA= 0x00;
		//_delay_ms(300);


	    //PORTA |= (1<<PORTA7);

	}

}

ISR (USART_RXC_vect)
{
	uint8_t oldsrg = SREG;

	cli();
	char received_char = UDR;

	PORTA = received_char;
	_delay_ms(600);

	PORTA= 0x00;
	_delay_ms(50);

	PORTA= 0xFF;
	_delay_ms(100);

	PORTA= 0x00;
	_delay_ms(100);

	SREG = oldsrg;
}