text: #ifndef USART_H
  #define USART_H
  
  #include "Global.h"
  #include "Util.h"
  #include <avr/io.h>
  #include <avr/interrupt.h>
  #include <util/atomic.h>
  #include <string.h>
  
  #define USART_BAUDRATE 9600
  #define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
  
  void USART_init(void);
  unsigned char USART_sendStr(const char*);
  unsigned char USART_sendChar(char);
  unsigned char USART_available(void);
  char USART_readChar(void);
  char USART_peek(void);
  
  #endif
  