File content as of revision 4:9e935689c3c4:

#include "mbed.h"
#define BUTTON1 p14
#define BUTTON! A1

int modifyBit(int x, unsingned char position, bool State);
int lauflicht(bool richtung, int time, int &anz);
void nibbleLeds(int value);
void printb(uint8_t x);


BusOut myleds(LED1,LED2,LED3,LED4);
DigitalIn button(BUTTON1);

const int INIT = 0x03;

int main ()
{
    int anzahl, anz;
    uint8_t value = INIT;


}

int modifyBit (int x, uint8_t position, bool State)
{
    int mask = 1 << position;
    int state = int(State);
    return (x & ~mask) | ((state << position) & mask);
}

int lauflicht (bool richtung, int time, int &anz)
{
    int i;
    uint8_t lauf = 0x01;

    if(!richtung)
        lauf = 0x08;
    while(1) {
        nibbleLeds(lauf&0x0F);
        if(richtung) {
            lauf = lauf << 1;
            if(lauf > 8)
                lauf = 0x01;
        } else {
            lauf = lauf >> 1;
            if(lauf == 0)
                lauf = 0x08;
        }
        if(button)
            break;
        wait_ms(time);
        anz++;
    }
    return anz;
}

void printb(uint8_t x)
{
    for(int i=sizeof (x) << 3; i; i--)
        putchar('0' + ((x>>(i-1))&1));
    printf("\n");
}

void nibbleLeds(int value)
{
    myleds = value%16;
}