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