//數碼管譯碼函數
uchar encoder(uchar key)
{
uchar num;
switch(key)
{
  case 0x00:
  num=0xc0;break;
  case 0x01:
  num=0xf9;break;
  case 0x02:
  num=0xa4;break;
  case 0x03:
  num=0xb0;break;
  case 0x04:
  num=0x99;break;
  case 0x05:
  num=0x92;break;
  case 0x06:
  num=0x82;break;
  case 0x07:
  num=0xf8;break;
  case 0x08:
  num=0x80;break;
  case 0x09:
  num=0x90;break;
  }
  return(num);
}