#define DELAY 200000
void setup() {  //like main()
  // put your setup code here, to run once:
  volatile char *dirf,*dirk;

  dirf = 0x30;    dirk = 0x107;
  *dirf = 0x03;   *dirk = 0x03;
  
}

void loop() {  //void loop is like arduino programming.So we use while(1) instead
  // put your main code here, to run repeatedly:
  volatile char *outf,*outk;
  volatile long i;
  
     outf = 0x31;   outk = 0x108;
    *outk = 0x02;   *outf = 0x01;

  for(i=0;i<DELAY;i++);
   *outk = 0x01; 
   *outf = 0x01;

   for(i=0;i<DELAY;i++);
   *outk = 0x01; 
   *outf = 0x02;

   for(i=0;i<DELAY;i++);

   *outk = 0x02; 
   *outf = 0x02;
   for(i=0;i<DELAY;i++);
}