Arduino-HomeWork-??-7seg-count_down-ver2

char TAB[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D,
              0x7D, 0x27, 0x7F, 0x67, 0x77, 0x7C,
              0x39, 0x5E, 0x79, 0x71};

int val = 0, orgin;

void setup() {
  // put your setup code here, to run once:
  DDRD |= 0b11111111;
  PORTD = 0x00;
  val = PINB;
  orgin = val;
}

void loop() {
  // put your main code here, to run repeatedly:
  if(val!=0){
    PORTD = TAB[val--];
    delay(1000);
  }
  else{
    for(int i=0;i<3;i++){
      PORTD = TAB[val];
      delay(300);
      PORTD = 0x00;
      delay(300);
    }
    val = orgin;
    delay(300);
  }
}