//Press any switch & display that number.
//Ex: 1 -> 8, 2-> 7, 8 -> 1
void setup()
{
  volatile char *dir;
  volatile char *dirk;
  dir=0x30;
  dirk=0x107;
  *dir=0xFF;
  *dirk=0x00;
}

char digicode(int i)
{
  volatile char y;
  switch(i) {
    
    case 0:
    y=0x3f;
    break;

    case 1:
    y=0x06;
    break;

    case 2:
    y=0x5b;
    break;

    case 3:
    y=0x4f;
    break;

    case 4:
    y=0x66;
    break;

    case 5:
    y=0x6d;
    break;

    case 6:
    y=0x7d;
    break;

    case 7:
    y=0x07;
    break;

    case 8:
    y=0x7f;
    break;

    case 9:
    y=0x6f;
    break;
  }
    return y;
}
void loop()
{
  volatile char *out;
  volatile char *ink;
  volatile char x;
  volatile unsigned char z;
  volatile int i=1,flag=0,k=0;
  volatile long j;
  out=0x31;
  ink=0x106;
  z=0x80;
  x=*ink;
  if((x&z)==z)
  {
    for(k=0;k<=9;k++)
    {
      *out=digicode(k);
      for(j=0;j<600000;j++);
    }
    for(k=9;k>=0;k--)
    {
      *out=digicode(k);
      for(j=0;j<600000;j++);
    }
  }
}