Crc算法 ssp delphi 算法
原算法是C的：
#define FALSE 0x00
#define TRUE 0x01
#define uchar unsigned char
#define uint unsigned int
uchar CrcL,CrcH;
const uint CrcTable[8*32]=
{
0x0000,0x8005,0x800F,0x000A,0x801B,0x001E,0x0014,0x8011,
0x8033,0x0036,0x003C,0x8039,0x0028,0x802D,0x8027,0x0022,
0x8063,0x0066,0x006C,0x8069,0x0078,0x807D,0x8077,0x0072,
0x0050,0x8055,0x805F,0x005A,0x804B,0x004E,0x0044,0x8041,
0x80C3,0x00C6,0x00CC,0x80C9,0x00D8,0x80DD,0x80D7,0x00D2,
0x00F0,0x80F5,0x80FF,0x00FA,0x80EB,0x00EE,0x00E4,0x80E1,
0x00A0,0x80A5,0x80AF,0x00AA,0x80BB,0x00BE,0x00B4,0x80B1,
0x8093,0x0096,0x009C,0x8099,0x0088,0x808D,0x8087,0x0082,
0x8183,0x0186,0x018C,0x8189,0x0198,0x819D,0x8197,0x0192,
0x01B0,0x81B5,0x81BF,0x01BA,0x81AB,0x01AE,0x01A4,0x81A1,
0x01E0,0x81E5,0x81EF,0x01EA,0x81FB,0x01FE,0x01F4,0x81F1,
0x81D3,0x01D6,0x01DC,0x81D9,0x01C8,0x81CD,0x81C7,0x01C2,
0x0140,0x8145,0x814F,0x014A,0x815B,0x015E,0x0154,0x8151,
0x8173,0x0176,0x017C,0x8179,0x0168,0x816D,0x8167,0x0162,
0x8123,0x0126,0x012C,0x8129,0x0138,0x813D,0x8137,0x0132,
0x0110,0x8115,0x811F,0x011A,0x810B,0x010E,0x0104,0x8101,
0x8303,0x0306,0x030C,0x8309,0x0318,0x831D,0x8317,0x0312,
0x0330,0x8335,0x833F,0x033A,0x832B,0x032E,0x0324,0x8321,
0x0360,0x8365,0x836F,0x036A,0x837B,0x037E,0x0374,0x8371,
0x8353,0x0356,0x035C,0x8359,0x0348,0x834D,0x8347,0x0342,
0x03C0,0x83C5,0x83CF,0x03CA,0x83DB,0x03DE,0x03D4,0x83D1,
0x83F3,0x03F6,0x03FC,0x83F9,0x03E8,0x83ED,0x83E7,0x03E2,
0x83A3,0x03A6,0x03AC,0x83A9,0x03B8,0x83BD,0x83B7,0x03B2,
0x0390,0x8395,0x839F,0x039A,0x838B,0x038E,0x0384,0x8381,
0x0280,0x8285,0x828F,0x028A,0x829B,0x029E,0x0294,0x8291,
0x82B3,0x02B6,0x02BC,0x82B9,0x02A8,0x82AD,0x82A7,0x02A2,
0x82E3,0x02E6,0x02EC,0x82E9,0x02F8,0x82FD,0x82F7,0x02F2,
0x02D0,0x82D5,0x82DF,0x02DA,0x82CB,0x02CE,0x02C4,0x82C1,
0x8243,0x0246,0x024C,0x8249,0x0258,0x825D,0x8257,0x0252,
0x0270,0x8275,0x827F,0x027A,0x826B,0x026E,0x0264,0x8261,
0x0220,0x8225,0x822F,0x022A,0x823B,0x023E,0x0234,0x8231,
0x8213,0x0216,0x021C,0x8219,0x0208,0x820D,0x8207,0x0202
};
//------------------------------------
void UpdateCrc(const uchar num)
{
uint table_addr;
table_addr=(num ^ Crch);
Crch=(CrcTable[table_addr] >> 8) ^ CrcL;
CrcL=(CrcTable[table_addr] & 0x00FF);
}
//------------------------------------
void ResetCrc(void)
{
CrcL=0xFF;
CrcH=0xFF;
}
应用示例: 对 7F 80 03 02 FF FF 进行校验,假设 WrBuf[] 存放的数据是 0x7f..0xff,0xff 等待数据,
该数据包的 Crc 计算如下:
int i0,s_len;
ResetCrc();
for(i0=1;i0<6;i0++) UpdateCrc(WrBuf[i0]); // 计算 Crc，0x7f 不参加 Crc 计算
WrBuf[i0++]=CrcL;
WrBuf[i0++]=CrcH;
s_len=i0;
for(i0=0;i0<s_len;i0++) SendChar (WrBuf[i0]); // 数据发送到识币器
//-----------------------------
本人新手，“CrcTable[table_addr]”这个数组的下标是多少啊？晕！求将上面的算法改成delphi的
delphi c
[解决办法]
我直接帮你把他翻译过来算了，与你的第1、3结果一样，第2个不一样。太晚了，我把代码贴出来你先看一下，我明天再看是什么原因。
type
TForm1 = class(TForm)
Button1: TButton;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
const
CrcTable: array [0 .. 255] of word = ($0000, $8005, $800F, $000A, $801B,
$001E, $0014, $8011, $8033, $0036, $003C, $8039, $0028, $802D, $8027, $0022,
$8063, $0066, $006C, $8069, $0078, $807D, $8077, $0072, $0050, $8055, $805F,
$005A, $804B, $004E, $0044, $8041, $80C3, $00C6, $00CC, $80C9, $00D8, $80DD,
$80D7, $00D2, $00F0, $80F5, $80FF, $00FA, $80EB, $00EE, $00E4, $80E1, $00A0,
$80A5, $80AF, $00AA, $80BB, $00BE, $00B4, $80B1, $8093, $0096, $009C, $8099,
$0088, $808D, $8087, $0082, $8183, $0186, $018C, $8189, $0198, $819D, $8197,
$0192, $01B0, $81B5, $81BF, $01BA, $81AB, $01AE, $01A4, $81A1, $01E0, $81E5,
$81EF, $01EA, $81FB, $01FE, $01F4, $81F1, $81D3, $01D6, $01DC, $81D9, $01C8,
$81CD, $81C7, $01C2, $0140, $8145, $814F, $014A, $815B, $015E, $0154, $8151,
$8173, $0176, $017C, $8179, $0168, $816D, $8167, $0162, $8123, $0126, $012C,
$8129, $0138, $813D, $8137, $0132, $0110, $8115, $811F, $011A, $810B, $010E,
$0104, $8101, $8303, $0306, $030C, $8309, $0318, $831D, $8317, $0312, $0330,
$8335, $833F, $033A, $832B, $032E, $0324, $8321, $0360, $8365, $836F, $036A,
$837B, $037E, $0374, $8371, $8353, $0356, $035C, $8359, $0348, $834D, $8347,
$0342, $03C0, $83C5, $83CF, $03CA, $83DB, $03DE, $03D4, $83D1, $83F3, $03F6,
$03FC, $83F9, $03E8, $83ED, $83E7, $03E2, $83A3, $03A6, $03AC, $83A9, $03B8,
$83BD, $83B7, $03B2, $0390, $8395, $839F, $039A, $838B, $038E, $0384, $8381,
$0280, $8285, $828F, $028A, $829B, $029E, $0294, $8291, $82B3, $02B6, $02BC,
$82B9, $02A8, $82AD, $82A7, $02A2, $82E3, $02E6, $02EC, $82E9, $02F8, $82FD,
$82F7, $02F2, $02D0, $82D5, $82DF, $02DA, $82CB, $02CE, $02C4, $82C1, $8243,
$0246, $024C, $8249, $0258, $825D, $8257, $0252, $0270, $8275, $827F, $027A,
$826B, $026E, $0264, $8261, $0220, $8225, $822F, $022A, $823B, $023E, $0234,
$8231, $8213, $0216, $021C, $8219, $0208, $820D, $8207, $0202);
var
Form1: TForm1;
CrcL, CrcH: byte;
implementation
{$R *.dfm}
procedure ResetCrc;
begin
CrcL := $FF;
CrcH := $FF;
end;
procedure UpdateCrc(const num: byte);
var
table_addr: byte;
begin
table_addr := (num xor CrcH);
CrcH := (CrcTable[table_addr] shr 8) xor CrcL;
CrcL := (CrcTable[table_addr] and $00FF);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
i0, s_len: integer;
WrBuf: array [1 .. 32] of byte;
s:string;
begin
s:='';
WrBuf[1] := $7F;
WrBuf[2] := $80;
WrBuf[3] := $01;
WrBuf[4] := $07;
//WrBuf[5] := $ef;
//WrBuf[6] := $00;
ResetCrc;
for i0 := 2 to 4 do
UpdateCrc(WrBuf[i0]); // 计算 Crc，0x7f 不参加 Crc 计算
WrBuf[i0] := CrcL;
inc(i0);
WrBuf[i0] := CrcH;
s_len := i0;
for i0 := 1 to s_len do s:=s+inttohex(WrBuf[i0],2)+' ';
label1.Caption := s;
end;
[解决办法]
参考一个C程序，这是结果
function CalCRC8005(AData:array of Byte; AStart,AEnd:Integer): Word;
const
GENP = $8005;
var
crc:Word;
i:Integer;
procedure CalOneByte(AByte:Byte);
var
j:Integer;
msb:Word; //移出的最高位
tmp:Word;
begin
tmp:=AByte;
tmp:=tmp shl 8;
crc:=crc xor tmp;
for j := 0 to 7 do
begin
msb:= crc and $8000;
crc:=crc shl 1;
if msb = $8000 then
crc:= crc xor GENP;
end;
end;
begin
crc:=$FFFF;
//crc:=$0000;
for i := AStart to AEnd do
CalOneByte(AData[i]);
Result:=crc;
end;
这里注意，crc的案值不同，结果也不同