#include"math.h"

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

}
void loop() 
{
  volatile char *outf, x;
  volatile char display[]={0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x7, 0x7f, 0x6f};
  volatile char *outk;
  outf=0x31; outk=0x108;
  *outk=15;
  x=*outk;
 
  for(int i =0; i<4; i++)
  {
   *outf= display[i];
   *outk= 15-pow(2,i);
   *outk=0xff;
  }

}