调用函数缺变量，怎么解决啊？高手们帮帮忙，谢谢！

Question

unit CRC16;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;type
   WordPtr=^char;
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
CONST
  CRC16table: ARRAY[0..255] OF WORD =
 ($0000,$C0C1,$C181,$0140,$C301,$03C0,$0280,$C241,$C601,$06C0,$0780,
  $C741,$0500,$C5C1,$C481,$0440,$CC01,$0CC0,$0D80,$CD41,$0F00,$CFC1,
  $CE81,$0E40,$0A00,$CAC1,$CB81,$0B40,$C901,$09C0,$0880,$C841,$D801,
  $18C0,$1980,$D941,$1B00,$DBC1,$DA81,$1A40,$1E00,$DEC1,$DF81,$1F40,
  $DD01,$1DC0,$1C80,$DC41,$1400,$D4C1,$D581,$1540,$D701,$17C0,$1680,
  $D641,$D201,$12C0,$1380,$D341,$1100,$D1C1,$D081,$1040,$F001,$30C0,
  $3180,$F141,$3300,$F3C1,$F281,$3240,$3600,$F6C1,$F781,$3740,$F501,
  $35C0,$3480,$F441,$3C00,$FCC1,$FD81,$3D40,$FF01,$3FC0,$3E80,$FE41,
  $FA01,$3AC0,$3B80,$FB41,$3900,$F9C1,$F881,$3840,$2800,$E8C1,$E981,
  $2940,$EB01,$2BC0,$2A80,$EA41,$EE01,$2EC0,$2F80,$EF41,$2D00,$EDC1,
  $EC81,$2C40,$E401,$24C0,$2580,$E541,$2700,$E7C1,$E681,$2640,$2200,
  $E2C1,$E381,$2340,$E101,$21C0,$2080,$E041,$A001,$60C0,$6180,$A141,
  $6300,$A3C1,$A281,$6240,$6600,$A6C1,$A781,$6740,$A501,$65C0,$6480,
  $A441,$6C00,$ACC1,$AD81,$6D40,$AF01,$6FC0,$6E80,$AE41,$AA01,$6AC0,
  $6B80,$AB41,$6900,$A9C1,$A881,$6840,$7800,$B8C1,$B981,$7940,$BB01,
  $7BC0,$7A80,$BA41,$BE01,$7EC0,$7F80,$BF41,$7D00,$BDC1,$BC81,$7C40,
  $B401,$74C0,$7580,$B541,$7700,$B7C1,$B681,$7640,$7200,$B2C1,$B381,
  $7340,$B101,$71C0,$7080,$B041,$5000,$90C1,$9181,$5140,$9301,$53C0,
  $5280,$9241,$9601,$56C0,$5780,$9741,$5500,$95C1,$9481,$5440,$9C01,
  $5CC0,$5D80,$9D41,$5F00,$9FC1,$9E81,$5E40,$5A00,$9AC1,$9B81,$5B40,
  $9901,$59C0,$5880,$9841,$8801,$48C0,$4980,$8941,$4B00,$8BC1,$8A81,
  $4A40,$4E00,$8EC1,$8F81,$4F40,$8D01,$4DC0,$4C80,$8C41,$4400,$84C1,
  $8581,$4540,$8701,$47C0,$4680,$8641,$8201,$42C0,$4380,$8341,$4100,
  $81C1,$8081,$4040);
var
  Form1: TForm1;  Function CRC1(InString:Pchar;iStrLen:integer):Word;
implementation{$R *.dfm}
Function CRC1(InString:Pchar;iStrLen:integer):Word;
Var
  CRC,CRC16     : Word;
  Index1,
  Index2  : Byte;
begin
  CRC := $FFFF;
  For Index1 := 0 to iStrLen - 1 do
  begin
    Index2 := CRC xor byte((InString + Index1)^);
    CRC := (CRC SHR 8) xor (CRC16table[Index2]);
  end;
  CRC1:=(CRC and $FFFF);
end;procedure TForm1.Button1Click(Sender: TObject);
varCRC1:word;
UART_TX_BUFFER:array[1..5] of char;
 Ptr:{PbyteArray ;}Pchar;
begin
Ptr:= @UART_TX_BUFFER;
UART_TX_BUFFER[1]:=chr($aa);
UART_TX_BUFFER[2]:=chr($05);
UART_TX_BUFFER[3]:=chr($28);
UART_TX_BUFFER[4]:=chr($01);
CRC1:=CRC1(Ptr;3);
end;end.
倒数第三行CRC1:=CRC1(Ptr;3);提示错误如下：
[Error] CRC16.pas(79): Missing operator or semicolon
怎么改正，着急中，各位帮帮小弟吧，这几天已经快让找个程序弄疯了！

Answer 1

CRC1:=CRC1(Ptr,3);//注意是逗号，不是分号

Answer 2

呵呵 顶2楼的 这样的错误建议LZ以后多注意点  ~~其实DELPHI的错误提示已经告诉你的错误了 细心些 ~~~

Answer 3

现在可以通过，但是CRC1:=(CRC and $FFFF);这句为什么不返回函数值呢，导致CRC1:=CRC1(Ptr;3);没有值，苦恼啊！

Answer 4

变量CRC1不是全局的，
而且函数CRC1没有返回值！！！！

Answer 5

CRC1:=(CRC and $FFFF);不就是返回值吗?可能被xor成0了