File content as of revision 2:0fcc9b85c8f6:

#include "led.h"
#include "mbed.h"

DigitalOut led_0(PA_4);
DigitalOut led_1(PA_5);
DigitalOut led_2(PA_6);
DigitalOut led_3(PA_7);

enum Step{LEFT, RIGHT};

void LedInt(void){
    //IO1DIR=IO1DIR|(LED0_bm|LED1_bm|LED2_bm|LED3_bm);
    //IO1SET= LED0_bm;
}
    
void LedOn(unsigned char ucLedIndeks){
    
    
    //IO1CLR = LED0_bm|LED1_bm|LED2_bm|LED3_bm;
    led_0=0;
    led_1=0;
    led_2=0;
    led_3=0;
    switch (ucLedIndeks) {
        case 0:
            led_0=1;
            break;
        case 1:
            led_1=1;
            break;
        case 2:
            led_2=1;
            break;
        case 3:
            led_3=1;
            break;
        default:
            break;
    }
    
    
}
void Led_Step(enum Step Direction){

    static unsigned int uiDioda;

    if (Direction == RIGHT ){
        uiDioda++;
    }else{
        uiDioda--;
    }
    LedOn(uiDioda%4);
}

void Led_StepLeft(void){
        Led_Step(LEFT);
}

void Led_StepRight(void){
        Led_Step(RIGHT);
}