uint8_t pins [7] = {PA0, PA1, PA2, PA3, PA4, PA5, PA6};
uint8_t digits [4] = {PA9, PA10, PA11, PA12};
int buttonCount1 = 0;
int buttonCount2 = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  for (int i=0; i<7; i++){
    pinMode(pins[i], OUTPUT);
  }
  for(int i = 0; i < 4; i++){
    pinMode(digits[i], OUTPUT);
  }
  pinMode(PB4, OUTPUT);
  pinMode(PB5, OUTPUT);
  digitalWrite(PB4, LOW);
  digitalWrite(PB5, LOW);
  attachInterrupt(digitalPinToInterrupt(PB14), interruption1, RISING);
  attachInterrupt(digitalPinToInterrupt(PB15), interruption2, RISING);  
}

void interruption1() {
  digitalWrite(PB4, !digitalRead(PB4));
  buttonCount1++;
}

void interruption2() {
  digitalWrite(PB5, !digitalRead(PB5));
  buttonCount2++;
}

void pick_digit(int number) {
  digitalWrite(PA9, HIGH);
  digitalWrite(PA10, HIGH);
  digitalWrite(PA11, HIGH);
  digitalWrite(PA12, HIGH);
  switch(number) {
    case 1:
      digitalWrite(PA9, LOW);
      break;
    case 2:
      digitalWrite(PA10, LOW);
      break;
    case 3:
      digitalWrite(PA11, LOW);
      break;
    case 4:
      digitalWrite(PA12, LOW);
      break;
  }
}

void show_number(int number) {
  switch(number) {
    case 0:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, HIGH);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, LOW);
      break;
    case 1:
      digitalWrite(PA0, LOW);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, LOW);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, LOW);
      digitalWrite(PA6, LOW);
      break;
    case 2:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, LOW);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, HIGH);
      digitalWrite(PA5, LOW);
      digitalWrite(PA6, HIGH);
      break;
    case 3:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, LOW);
      digitalWrite(PA6, HIGH);
      break;
    case 4:
      digitalWrite(PA0, LOW);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, LOW);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, HIGH);
      break;
    case 5:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, LOW);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, HIGH);
      break;
    case 6:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, LOW);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, HIGH);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, HIGH);
      break;
    case 7:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, LOW);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, LOW);
      digitalWrite(PA6, LOW);
      break;
    case 8:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, HIGH);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, HIGH);
      break;
    case 9:
      digitalWrite(PA0, HIGH);
      digitalWrite(PA1, HIGH);
      digitalWrite(PA2, HIGH);
      digitalWrite(PA3, HIGH);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, HIGH);
      digitalWrite(PA6, HIGH);
      break;
    default:
      digitalWrite(PA0, LOW);
      digitalWrite(PA1, LOW);
      digitalWrite(PA2, LOW);
      digitalWrite(PA3, LOW);
      digitalWrite(PA4, LOW);
      digitalWrite(PA5, LOW);
      digitalWrite(PA6, LOW);
    break;
  }
}

int refreshing = 100;
int del = 300;

void loop() {
  show_number(-1);
  pick_digit(1);
  show_number((buttonCount1/10/refreshing)%10);
  delayMicroseconds(del);

  show_number(-1);
  pick_digit(2);
  show_number((buttonCount1/refreshing)%10);
  delayMicroseconds(del);
 
  show_number(-1);
  pick_digit(3);
  show_number((buttonCount2/10/refreshing)%10);
  delayMicroseconds(del);
 
  show_number(-1);
  pick_digit(4);
  show_number((buttonCount2/refreshing)%10);
  delayMicroseconds(del);
}