UART Code

#include <avr/io.h>
#include <avr/delay.h>
#define F_CPU ((unsigned long)8000000)
#define F_OSC 8000000// for 8mhz

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

unsigned char

int main (void)
{
char ReceivedByte;

UCSRB = (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry
UCSRC = (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes

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

for (;;) // Loop forever
{
while ((UCSRA & (1 << RXC)) == 0) {}; // Do nothing until data have been received and is ready to be read from UDR
ReceivedByte = UDR; // Fetch the received byte value into the variable "ByteReceived"
//_delay_ms(1000);

while ((UCSRA & (1 << UDRE)) == 0) {}; // Do nothing until UDR is ready for more data to be written to it
UDR = ReceivedByte; // Echo back the received byte back to the computer
}
}