void setup() {
 volatile char *dirf,*dirk;
 volatile char *outf;
 volatile char *dataa, *datac;
 volatile char *outa, *outc;
 volatile *inpk;

dirf=0x30; *dirf=0x03; outf=0x31;
dirk=0x107; *dirk=0X00;inpk=0x106; 
dataa=0x21; datac=0x27; outa=0x22;outc=0x28;

//volatile char x;
while(1){
for (volatile long i=0; i<2; i++){
  *outf=1<<i;
  *outa=*inpk;
  if(*inpk !=0){
       *outc=1<<i;
        *outc=0x00;
  }
}
}

}

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

}