const char digitPatterns[10] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 55
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};

void setup() {
  // Initialize pointers
  volatile char *direction_f, *output_f;
  volatile char *direction_k, *input_k;
  volatile long long i;

  // Set direction and initialize ports
  direction_k = (char*)0x107;
  direction_f = (char*)0x30;
  output_f = (char*)0x31;
  input_k = (char*)0x106;

  *direction_f = 0xff;  // Set port F as output
  *direction_k = 0x00;  // Set port K as input

  

  while (1) {
    volatile int trace = *input_k;
    if(trace & 0x40){
      for(volatile int i=0;i<=9;i++){
        *output_f=digitPatterns[i];
        delayloop();
         }
         for(volatile int k=9;k>=0;k--){
          *output_f=digitPatterns[k];
          delayloop();
         }

    
   
    } else {
      *output_f = 0x00;  // Clear display if no valid switch is pressed
    }
  }
}
void delayloop(){
  for (volatile long d=0;d<200000;d++);
}


void loop() {
  // Empty as setup() contains the main logic
}