/*****************************************************************************/

  /* Message byte definitions: */
    #define MSG_SOM1 0x3c
    #define MSG_SOM2 0x3e
    #define MSG_EOM1 0x0d
    #define MSG_EOM2 0x0a

    #define MSG_TYPE_ANSWER_OK  0x01
    #define MSG_TYPE_ANSWER_NOK 0x02
    #define MSG_TYPE_BAUDRATE   0x03
    #define MSG_TYPE_MUXLINE    0x04

/*****************************************************************************/

    #define LED0_ON  PORTB &= ~(1 << PIN0);
    #define LED0_OFF PORTB |=  (1 << PIN0);
    #define LED1_ON  PORTB &= ~(1 << PIN1);
    #define LED1_OFF PORTB |=  (1 << PIN1);

/*****************************************************************************/

    #define EN_MUX_LINE0     \
      PORTB &= ~(1 << PIN4); \
      PORTB &= ~(1 << PIN5); \
      PORTB &= ~(1 << PIN6); \

    #define EN_MUX_LINE1     \
      PORTB &= ~(1 << PIN4); \
      PORTB &= ~(1 << PIN5); \
      PORTB |=  (1 << PIN6); \

    #define EN_MUX_LINE2     \
      PORTB &= ~(1 << PIN4); \
      PORTB |=  (1 << PIN5); \
      PORTB &= ~(1 << PIN6); \

    #define EN_MUX_LINE3     \
      PORTB &= ~(1 << PIN4); \
      PORTB |=  (1 << PIN5); \
      PORTB |=  (1 << PIN6); \

    #define EN_MUX_LINE4     \
      PORTB |=  (1 << PIN4); \
      PORTB &= ~(1 << PIN5); \
      PORTB &= ~(1 << PIN6); \

    #define EN_MUX_LINE5     \
      PORTB |=  (1 << PIN4); \
      PORTB &= ~(1 << PIN5); \
      PORTB |=  (1 << PIN6); \

    #define EN_MUX_LINE6     \
      PORTB |=  (1 << PIN4); \
      PORTB |=  (1 << PIN5); \
      PORTB &= ~(1 << PIN6); \

    #define EN_MUX_LINE7     \
      PORTB |=  (1 << PIN4); \
      PORTB |=  (1 << PIN5); \
      PORTB |=  (1 << PIN6); \

/*****************************************************************************/