typedef enum {LED_A, LED_B, LED_C, LED_D} LED;
typedef enum {ON, OFF, TOGGLE} ACTION;
inline void SetLedState (LED led, ACTION act)
{
   const char led_mapping []= {3,7,1,0,6}; //
   switch (act)
   {
     case ON:
       PORTB |= (1 << led_mapping[led]);
     break;
     case OFF:
       PORTB &= ~(1 << led_mapping[led]);
     break;
     case TOGGLE:
       PORTB ^= (1 << led_mapping[led]);
     break;
   }
}