• We recently switched our forum platform. If you experience any issues please email support@crystalfontz.com

[CFA631] CRC calculation in Delphi

MerijnB

New member
For whoever might need it. Possibly also works for other models, didn't check.

Code:
function CalcCRC(const Buffer; BufferSize: Cardinal): Word;
 const
  CRCLookupTable : array[Byte] of Word = ($0000, $1189, $2312, $329B, $4624, $57AD, $6536, $74BF,
                                          $8C48, $9DC1, $AF5A, $BED3, $CA6C, $DBE5, $E97E, $F8F7,
                                          $1081, $0108, $3393, $221A, $56A5, $472C, $75B7, $643E,
                                          $9CC9, $8D40, $BFDB, $AE52, $DAED, $CB64, $F9FF, $E876,
                                          $2102, $308B, $0210, $1399, $6726, $76AF, $4434, $55BD,
                                          $AD4A, $BCC3, $8E58, $9FD1, $EB6E, $FAE7, $C87C, $D9F5,
                                          $3183, $200A, $1291, $0318, $77A7, $662E, $54B5, $453C,
                                          $BDCB, $AC42, $9ED9, $8F50, $FBEF, $EA66, $D8FD, $C974,
                                          $4204, $538D, $6116, $709F, $0420, $15A9, $2732, $36BB,
                                          $CE4C, $DFC5, $ED5E, $FCD7, $8868, $99E1, $AB7A, $BAF3,
                                          $5285, $430C, $7197, $601E, $14A1, $0528, $37B3, $263A,
                                          $DECD, $CF44, $FDDF, $EC56, $98E9, $8960, $BBFB, $AA72,
                                          $6306, $728F, $4014, $519D, $2522, $34AB, $0630, $17B9,
                                          $EF4E, $FEC7, $CC5C, $DDD5, $A96A, $B8E3, $8A78, $9BF1,
                                          $7387, $620E, $5095, $411C, $35A3, $242A, $16B1, $0738,
                                          $FFCF, $EE46, $DCDD, $CD54, $B9EB, $A862, $9AF9, $8B70,
                                          $8408, $9581, $A71A, $B693, $C22C, $D3A5, $E13E, $F0B7,
                                          $0840, $19C9, $2B52, $3ADB, $4E64, $5FED, $6D76, $7CFF,
                                          $9489, $8500, $B79B, $A612, $D2AD, $C324, $F1BF, $E036,
                                          $18C1, $0948, $3BD3, $2A5A, $5EE5, $4F6C, $7DF7, $6C7E,
                                          $A50A, $B483, $8618, $9791, $E32E, $F2A7, $C03C, $D1B5,
                                          $2942, $38CB, $0A50, $1BD9, $6F66, $7EEF, $4C74, $5DFD,
                                          $B58B, $A402, $9699, $8710, $F3AF, $E226, $D0BD, $C134,
                                          $39C3, $284A, $1AD1, $0B58, $7FE7, $6E6E, $5CF5, $4D7C,
                                          $C60C, $D785, $E51E, $F497, $8028, $91A1, $A33A, $B2B3,
                                          $4A44, $5BCD, $6956, $78DF, $0C60, $1DE9, $2F72, $3EFB,
                                          $D68D, $C704, $F59F, $E416, $90A9, $8120, $B3BB, $A232,
                                          $5AC5, $4B4C, $79D7, $685E, $1CE1, $0D68, $3FF3, $2E7A,
                                          $E70E, $F687, $C41C, $D595, $A12A, $B0A3, $8238, $93B1,
                                          $6B46, $7ACF, $4854, $59DD, $2D62, $3CEB, $0E70, $1FF9,
                                          $F78F, $E606, $D49D, $C514, $B1AB, $A022, $92B9, $8330,
                                          $7BC7, $6A4E, $58D5, $495C, $3DE3, $2C6A, $1EF1, $0F78);
var CurCRC: Word;
    P: ^Byte;
begin
 CurCRC := $ffff;
 P := @Buffer;

 while BufferSize <> 0 do
 begin
  CurCRC := (CurCRC shr 8) xor CRCLookupTable[(CurCRC xor P^) and $ff];
  dec(BufferSize);
  inc(P);
 end;

 result := not CurCRC;
end;

function CalcCRCStr(Data: ansistring): Word;
begin
 result := CalcCRC(Data[1], Length(Data));
end;
Looking for additional LCD resources? Check out our LCD blog for the latest developments in LCD technology.
 

CF Tech

Administrator
Awesome, I do not think we have a Delphi version of the CRC before.

The CRC is the same for the CFA-533, CFA-631, CFA-633 and CFA-635, so this routine should work for any of them.
 
Top