volatile unsigned char *dirf, *dira; // 7segment and push botton
volatile unsigned char *outf, *ina;


void sevenseg(volatile char a){
  switch(a){
    case 1: *outf=0x06; break;  //1
    case 2: *outf=0x5b; break;  //2
    case 3: *outf=0x4f; break;  //3
    case 4: *outf=0x66; break;  //4
    case 5: *outf=0x6d; break;  //5
    case 6: *outf=0x7d; break;  //6
    case 7: *outf=0x07; break;  //7
    case 8: *outf=0x7f; break;  //8
    case 9: *outf=0x6f; break;  //8
    default: *outf=0x3f; break;  //0
  }
}

void setup() {
  // put your setup code here, to run once:
  
  dirf=0x30; dira=0x21;
  *dirf=0xff; *dira=0x00;
  outf=0x31;  ina=0x20;

  volatile unsigned char inp;
  //volatile char i=0;
  sevenseg(0);
  while(1){
    
    // set 2 ques 8
    inp = *ina;
    if(inp&0x01==0x01){
      for(volatile char i=0;i<10;i++){
        sevenseg(i);
        for(volatile long del=0;del<500000;del++);
        inp = *ina;
        if((inp&0x02)==0x02){
          *outf=0x00;
          break;
        }
        if(i==9)
          i=-1;   
      }
      
    }  
    
  }
}

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

}