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

#define F_CPU 16000000UL
#define BAUD 9600
#define baud_prescaler (((F_CPU / (BAUD * 16UL))) - 1)

void uart_init(void)
{
  UBRR0H |= (baud_prescaler >> 8);
  UBRR0L |= baud_prescaler;
  UCSR0B |= (1 << RXEN0) | (1 << TXEN0);
  UCSR0C |= (1 << UCSZ01) | (1 << UCSZ00);
}

void data_transmit(char data)
{
  while(!(UCSR0A & (1 << UDRE0)));
  UDR0 = data;
}

char data_recieve(void)
{
  while(!(UCSR0A & (1 << RXC0)));
  return UDR0;
}

void send_data(char *string)
{
  while(*string != '\0')
  {
    data_transmit(*string++);
  }
}

int main(void)
{
  uart_init();

  while(1)
  {
    send_data("hello anish\r\n");
    if(UCSR0A & (1 << RXC0))
    {
      char temp = data_recieve();
      data_transmit(temp);
    }
    _delay_ms(500);
  }
  return 0;
}