void setup() {
  // put your setup code here, to run once:
  volatile char *dir,*out;
  volatile long i,j,k;
  dir=0x30;
  *dir=0xff;
  out=0x31;
  while(1){
      for(i=0;i<=2;i++){
        for(j=0;j<400000;j++);
     *out=1<<i;
     }
      for(j=0;j<400000;j++);
     for(i=5;i<=7;i++){
      for(j=0;j<40;j++);
     *out=1<<i;
     }
           for(j=0;j<400000;j++);

     for(i=3;i<=4;i++){
      for(j=0;j<40000;j++);
     *out=1<<i;
      for(j=0;j<40000;j++);
     }
           for(j=0;j<400000;j++);

      
     
     }
        
       


  }




void loop() {
  // put your main code here, to run repeatedly:


}