void setup() {
  // put your setup code here, to run once:
  volatile char* dir,*dir_in;
  dir=0x30;
  *dir=0xFF;  //set all pins as output
   dir_in=0x107;
  *dir_in=0x00; //direction set=input

volatile char* outF,*inK;
   volatile char x;
   volatile int i=0,j;
  outF=0x31;

  inK=0x106;

  while(1){
    x=*inK;
    if ((x & 0x01) == 0x01) {
    // delay(50);                      // Simple debounce (optional)
         // Confirm the switch is still pressed after debounce
      i++;
      if (i % 2) {
        *outF = 0x01;               // Turn on LED1
      } else {
        *outF = 0x02;               // Turn on LED2
      }
   delay(500);                // Avoid multiple presses due to bounce
    
  }

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



}