void setup() {
  // put your setup code here, to run once:
volatile char *dir;
dir=0x21;
*dir=0xFF;
}
void one(volatile char *out){
unsigned int bite;
*out=(1<<3)|(1<<7);
delay(1000);
*out=(1<<2)|(1<<6);
delay(1000);
*out=(1<<1)|(1<<5);
delay(1000);
*out=(1<<0)|(1<<4);
delay(1000);
}
void two(volatile char *out){
  unsigned int bite;
  for(bite=0;bite<=7;bite++){
    *out=(1<<bite);
    delay(500);
  }
  *out=0x00;
  delay(500);
  for(bite=7;bite>=0;bite--){
    *out=(1<<bite);
    delay(500);
  }
  delay(1000);
}
void three(volatile char *out){
  *out=(1<<0);
  delay(500);
  *out=(1<<2);
  delay(500);
  *out=(1<<1);
  delay(500);
  *out=(1<<3);
  delay(500);
  *out=(1<<4);
  delay(500);
 *out=(1<<6);
 delay(500);
 *out=(1<<5);
 delay(500);
  *out=(1<<7);
  delay(500);
}
void four(volatile char *out){
  *out=(1<<0);
  delay(1000);
   *out=0x00;
   delay(1000);
  *out=(1<<0)|(1<<1);
   delay(1000);
   *out=0x00;
   delay(1000);
  *out=(1<<0)|(1<<1)|(1<<2);
  delay(1000);
   *out=0x00;
   delay(1000);
  unsigned int bite;
  for(bite=7;bite>=0;bite--){
    *out=(1<<bite);
    delay(500);
  }
}
void loop() {
  // put your main code here, to run repeatedly:
volatile char *out;
out=0x22;
unsigned int value=0;
value=4;
switch(value){
  case 1:
  one(out);
  break;
  case 2:
  two(out);
  break;
  case 3:
  three(out);
  break;
  case 4:
  four(out);
  break;
  default:
  break;
}
}