uart.h

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#ifndef UART_H_
      #define UART_H_

      /* Define */
      #define MCU     atmega328p

      #define F_CPU     8000000UL 

      #define BAUD      19200

      #define MYUBRR    F_CPU/16/BAUD-1

      /* Include */
      #include <avr/io.h>
      #include <avr/interrupt.h>          // Used for sei(), cli() and ISR()

      /* Register names USART0 */
      #define UBRRH     UBRR0H
      #define UBRRL     UBRR0L

      #define UCSRA     UCSR0A
      #define UCSRB     UCSR0B
      #define UCSRC     UCSR0C

      #define UDR       UDR0
      #define UDRE      UDRE0
      #define UPE       UPE0

      #define DOR       DOR0
      #define FE        FE0
      #define RXC       RXC0
      #define TXB8      TXB80

      /* Method */
      void uart_init(unsigned int ubrr);
      void uart_putc(unsigned char data);

#endif /* UART_H_ */