void setup() {
  // put your setup code here, to run once:
  volatile long i,j,x,y;
  volatile char *dirF,*dirD,*dirA,*dirK;
  dirA=0x21; dirD=0x2a; dirF=0x30;
  *dirD=0x00;
  *dirA=0xff;
  *dirF=0xff;
  volatile char *outF=0x31,*inpD,*outA,*outK;
  outF=0x31;
  inpD=0x29;
  outA=0x22;
  dirK=0x107;
  *dirK=0xff;
  outK=0x108;
  while(1){
    for(i=0;i<4;i++){
      *outF=1<<i;
      x=*inpD;
      if(*inpD!=0){
        y=1<<i;
        if(y==0x01 && x==0x01){
          *outK=0x06;
        }
        if(y==0x01 && x==0x02){
          *outK=0x5b;
        }
        if(y==0x01 && x==0x04){
          *outK=0x4f;
        }
        if(y==0x01 && x==0x08){
          *outK=0x77;
        }
        if(y==0x02 && x==0x01){
          *outK=0x66;
        }
        if(y==0x02 && x==0x02){
          *outK=0x6d;
        }
        if(y==0x02 && x==0x04){
          *outK=0x7d;
        }
        if(y==0x02 && x==0x08){
          *outK=0x7c;
        }
        if(y==0x04 && x==0x01){
          *outK=0x07;
        }
        if(y==0x04 && x==0x02){
          *outK=0x7f;
        }
        if(y==0x04 && x==0x04){
          *outK=0x6f;
        }
        if(y==0x04 && x==0x08){
          *outK=0x39;
        }
        if(y==0x08 && x==0x02){
          *outK=0x3f;
        }
        if(y==0x08 && x==0x08){
          *outK=0x5e;
        }
        for(j=0;j<1000000;j++);
        *outK=0;
      }
    }
  }

}

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

}