byte LEDS[][2] = {
  {PB0, PB3},
  {PB0, PB2},
  {PB0, PB1},

  {PB1, PB3},
  {PB1, PB2},
  {PB1, PB0},

  {PB2, PB3},
  {PB2, PB1},
  {PB2, PB0},
  {PB3, PB2},
  {PB3, PB1},
  {PB3, PB0},
};

void bar(int index) {
  for (int i = 0; i < index; i++) {
    pinMode(PB0, INPUT);
    pinMode(PB1, INPUT);
    pinMode(PB2, INPUT);
    pinMode(PB3, INPUT);
    pinMode(LEDS[i][0], OUTPUT);
    pinMode(LEDS[i][1], OUTPUT);
    digitalWrite(LEDS[i][0], LOW);
    digitalWrite(LEDS[i][1], HIGH);
  }
}

void dot(int index) {
  pinMode(PB0, INPUT);
  pinMode(PB1, INPUT);
  pinMode(PB2, INPUT);
  pinMode(PB3, INPUT);
  pinMode(LEDS[index - 1][0], OUTPUT);
  pinMode(LEDS[index - 1][1], OUTPUT);
  digitalWrite(LEDS[index - 1][0], LOW);
  digitalWrite(LEDS[index - 1][1], HIGH);
}

void setup() {}

void loop() {

    bar(8);
  // dot(7);

}