#define DELAY 100000

void delay(){
  for(volatile long  i =0; i<DELAY;i++);
}

void setup() {
  volatile char* dirf,*dirk;
  dirf =(volatile char*) 0x30; dirk=(volatile char*)0x107;
  *dirf = 0xff;*dirk=0x00;
}

void loop() {
  volatile char* outf;
  outf = 0x31;
  *outf = 0x01;
  delay();
  *outf = 0x03;
  delay();
  *outf = 0x07;
  delay();
  *outf = 0x0f;
  delay();
  *outf = 0x1f;
  delay();
  *outf = 0x3f;
  delay();
  *outf = 0x7f;
  delay();
  *outf = 0xff;
  delay();
  *outf = 0x00;
  delay();
  *outf = 0x80;
  delay();
  *outf = 0xc0;
  delay();
  *outf = 0xe0;
  delay();
  *outf = 0xf0;
  delay();
  *outf = 0xf8;
  delay();
  *outf = 0xfc;
  delay();
  *outf = 0xfe;
  delay();
  *outf = 0xff;
  delay();
  *outf = 0x00;
  delay();

}