byte roj;
byte azu;
byte blan;
int tr = 0;
bool xd = false;

void setup(){
  //modo = blanco
  //incrementar = azul
  //decrementar = rojo
  DDRD = 0xFF;
  DDRB = 0x00;
  PORTD = 0x81;
}
void loop(){
  roj = PINB & 0x08;
  azu = PINB & 0x10;
  blan = PINB & 0x20;

  if (blan == 0){
    tr = tr + 1;
    delay(100);
    if (tr == 4){
      tr = 0;
    }
  }
  if (azu == 0 && roj == 0){
    PORTD = 0x01;
  }
  if (tr == 1){
    if (azu == 0){
      PORTD  = PORTD - 0x01;
      delay(100);
    }  
    if (roj == 0){
      PORTD  = PORTD + 0x01;
      delay(100);
    }
  }

  if (tr ==0){ 
      if(xd == true){
        PORTD = 0x00;
        xd = false;
      }
    if (roj == 0){
      PORTD = (PORTD << 0x01| PORTD>> 0x01);
      delay(100);
    }
    if (azu == 0){
      PORTD = ((PORTD + 0x10));
      delay(100);
    }
  }
 if (tr == 2){
  xd = true;
  if(roj == 0){
    PORTD = PORTD <<1 | PORTD;
    PORTD = PORTD & 0x81;
    delay(100);
  }
  if (azu == 0){
    PORTD = PORTD >>1;
    PORTD = PORTD | 0x81;
    delay(100);
  }
 }
 if (tr == 0){
  PORTD = 0x80 ;
  delay(250);
  PORTD = 0x40 ;
  delay(250);
  PORTD = 0x20;
  delay (250) ;
  PORTD = 0x10;
  delay(250);
  PORTD = 0x08;
  delay(250);
  PORTD = 0x04;
  delay(250);
  PORTD = 0x02;
  delay(250);
  PORTD = 0x01;
  delay(100);
  PORTD = 0x01;
  delay(100);
  PORTD = 0x02;
  delay(100);
  PORTD = 0x04;
  delay(100);
  PORTD = 0x08;
  delay(100);
  PORTD = 0x10;
  delay(100);
  PORTD = 0x20;
  delay(100);
  PORTD = 0x40;
  delay(100);
  PORTD = 0x80;
  delay(100);
   }
}