void scrollMessage( char *str )
{
    char msg[] = "1234";
    const uint8_t digits = 4;
    int8_t pos = 0;
    pos -= digits;

    for ( uint8_t i = 0 ; i < digits - 1 ; i++ )
    {
        if ( (pos + i) < 0 )
        {
            disp.dig[i] = 11; // Leerzeichen
        }
        else if ( pos + i > strlen(msg) - 1 )
        {
            disp.dig[i] = 11; // Leerzeichen
        }
        else
        {
            disp.dig[i] = msg[ pos + i ];
        }
        _delay_ms(500);
    }
}