void setup() {
  // put your setup code here, to run once:
  volatile unsigned char *ddrf;
  ddrf=0x30;
  *ddrf=0xFF;
}
volatile unsigned char *portf=0x31;
unsigned char _7SEGMENT[6] = {0xFF,0x06,0x5B,0x4F,0x66,0x6D};
void loop() {
  // put your main code here, to run repeatedly:
  int i;
  for(i=0;i<6;i++)
  {
    *portf = _7SEGMENT[i];
    delay(1000);
  }
  //*portf = 0x6D;

}