void setup(){
volatile char *PORT_F_DIR_REG = (char*) 0x30;
*PORT_F_DIR_REG = 0xFF;
volatile char *PORT_L_DIR_REG = (char*) 0x10A;
*PORT_L_DIR_REG = 0xFF;
}

void loop() {
volatile char *PORT_F_DATA_REG = (char*) 0x31;
volatile char *PORT_L_DATA_REG = (char*) 0x10B;
volatile long i,j,k;
for(i = 0; i<8; i++){
  *PORT_L_DATA_REG = (~(1 << i));
  *PORT_F_DATA_REG = (1 << i);
  *PORT_L_DATA_REG = (~(0x00));
  *PORT_F_DATA_REG = 0;
}


}