void setup() {
  // put your setup code here, to run once:
  volatile char *drf,*drk;
  drf=0x30;
  drk=0x107;
  *drk=0xff;
  *drf=0xff;;

}

void loop() {
  // put your main code here, to run repeatedly:
volatile char *outk,*outf;
volatile long i;

outk=0x108;
outf=0x31;

*outf=0x01;
*outk=0x01;
for(i=0;i<1000000;i++);
*outf=0x02;
*outk=0x01;
for(i=0;i<1000000;i++);
*outf=0x01;
*outk=0x02;
for(i=0;i<1000000;i++);
*outf=0x02;
*outk=0x02;
for(i=0;i<1000000;i++);


}