void setup() {
volatile char *dirb,*dirc,r;
volatile char *outb,*inc;
dirb = 0x24;
outb = 0x25;
*dirb = 0x01;
dirc = 0x27;
inc = 0x26;

while(1)
{
  r = *inc;
  if((r & 0x01) == 0x01)
  {
    *outb = 0x01; 
  }
  else if((r & 0x02) == 0x02)
  {
    *outb = 0x02;
  }
  else if((r & 0x04) == 0x04)
  {
    *outb = 0x04;
  }
  else{
    *outb = 0x00;
  }
}

}

void loop() {
  // put your main code here, to run repeatedly:

}