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

void loop() {
  // put your main code here, to run repeatedly:
 volatile char num[10]={0x3f,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0X6F};
 volatile char i;
 volatile long j;
 volatile char *outf=0x31;

 for(i=0;i<=9;i++)
 {
  if(i%2==0)
  {
  for(j=0;j<=600000;j++);
  *outf=num[i];
  }
}
  
 }