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CRC8 CRC16 汇编代码 直接用算法和查表法两种
2010-11-09


以下文件为原压缩包所有,原样保留。

直接下载rar文件点这里: crc.zip

Date: Wed, 05 Feb 1997 19:13:54 GMT
From: John Wren <jcwren@atlanta.com>
To: 8051code@keil.com
Subject: 8 Bit CCITT-8 CRC Calculator, Table And/Or Calculation Driven
 
        Here's a CCITT-8 CRC calculator.  The source contains both the
calculated (smaller but slower) version, and the table driven (faster
but larger) version.
 
                - John
John C. Wren, KD4DTS
jcwren@atlanta.com
770-840-9200 x2417 (W)

CRC8,如果有你汇编基础,看懂它应该没有问题,如果没有,那更好,看C的吧,更加简单。
[code="asm"]

;
;****************************************************************************
;
;  Purpose:
; Calculate CRC-8 Values.  Uses The CCITT-8 Polynomial, Expressed As
; X^8 + X^5 + X^4 + 1
;
;  Date:
; 08/03/93
;
;  Author:
; John C. Wren
;
;  Modications:
; 02/04/97 - Added Description Fields For Archive
;
;  Processor:
; Generic 8031
;
;  Assembler:
; Avocet AVA51
;
;  Dependencies:
; None
;
;  Files:
; None
;
;  Philosophic:
;
;****************************************************************************
;
;  Includes
;
;  %include "equates.inc"
  seg code
;
;****************************************************************************
;
;  Publics
;
  public CRC8_ADD_B
;
;****************************************************************************
;
;  Description:
; Calculates Value In Acc Into The Running CRC In 'B'
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
; 'B' Contains Running CRC Value
;
;  On Exit:
; 'B' Has Updated CRC Value
;
;  Affected:
; PSW.CY, B
;
;  Stack:
; 0 Bytes, Not Including Called Routines
;
;  Comments:
; Depending On Whether Space Or Speed Is Needed, Point This Jump To
; Code Needed And Comment Out The Other Block.  This Allows A Standard
; Entry Point To Be Used.
;
CRC8_ADD_B proc
  jmp CRC8_ADD_CALC  ; Use Fast Method
  endproc
;
;****************************************************************************
;
;  Description:
; Calculates Value In Acc Into The Running CRC In 'B', Using The Table
; Method.  (Faster But Larger)
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
; 'B' Contains Running CRC Value
;
;  On Exit:
; 'B' Has Updated CRC Value
;
;  Affected:
; PSW.CY, B
;
;  Stack:
; 3 Bytes, Not Including Called Routines
;
;  Comments:
; None
;
CRC8_ADD_TABLE proc
  push dph   ; Save DPH
  push dpl   ; Save DPL
  push acc   ; Save Acc
;
  mov dptr,#CRC8_DATA  ; Point To Table
  xrl a,b   ; XOR In CRC
  movc a,@a+dptr  ; Get New CRC Byte
  mov b,a   ; Store Back
;
  pop acc   ; Recover Acc
  pop dpl   ; Recover DPL
  pop dph   ; Recover DPH
  ret    ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Description:
; Calculates Value In Acc Into The Running CRC In 'B', Using The
; Calculation Method (Slower But Smaller).
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
; 'B' Contains Running CRC Value
;
;  On Exit:
; 'B' Has Updated CRC Value
;
;  Affected:
; PSW.CY, B
;
;  Stack:
; 3 Bytes, Not Including Called Routines
;
;  Comments:
; None
;
CRC8_ADD_CALC proc
  push acc   ; Save Acc
  push 0   ; Save R0
  push acc   ; Save Value
  mov r0,#8   ; Number Bits In Byte
;
l?p1  xrl a,b   ; Calculate CRC
  rrc a   ; Move To Carry
  mov a,b   ; Get The Last CRC Value
  jnc l?p2   ; Skip If Data == 0
  xrl a,#18h   ; Update The CRC Value
;
l?p2  rrc a   ; Position The New CRC
  mov b,a   ; Store The New CRC
  pop acc   ; Get The Remaining Bits
  rr a   ; Position The Next Bit
  push acc   ; Save The Remaining Bits
  djnz r0,l?p1   ; Repeat For 8 Bits
;
  pop acc   ; Clean Up Stack
  pop 0   ; Recover R0
  pop acc   ; Recover Acc
  ret    ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Data For Table Method
;
CRC8_DATA db 000h, 05eh, 0bch, 0e2h, 061h, 03fh, 0ddh, 083h
  db 0c2h, 09ch, 07eh, 020h, 0a3h, 0fdh, 01fh, 041h
  db 09dh, 0c3h, 021h, 07fh, 0fch, 0a2h, 040h, 01eh
  db 05fh, 001h, 0e3h, 0bdh, 03eh, 060h, 082h, 0dch
  db 023h, 07dh, 09fh, 0c1h, 042h, 01ch, 0feh, 0a0h
  db 0e1h, 0bfh, 05dh, 003h, 080h, 0deh, 03ch, 062h
  db 0beh, 0e0h, 002h, 05ch, 0dfh, 081h, 063h, 03dh
  db 07ch, 022h, 0c0h, 09eh, 01dh, 043h, 0a1h, 0ffh
  db 046h, 018h, 0fah, 0a4h, 027h, 079h, 09bh, 0c5h
  db 084h, 0dah, 038h, 066h, 0e5h, 0bbh, 059h, 007h
  db 0dbh, 085h, 067h, 039h, 0bah, 0e4h, 006h, 058h
  db 019h, 047h, 0a5h, 0fbh, 078h, 026h, 0c4h, 09ah
  db 065h, 03bh, 0d9h, 087h, 004h, 05ah, 0b8h, 0e6h
  db 0a7h, 0f9h, 01bh, 045h, 0c6h, 098h, 07ah, 024h
  db 0f8h, 0a6h, 044h, 01ah, 099h, 0c7h, 025h, 07bh
  db 03ah, 064h, 086h, 0d8h, 05bh, 005h, 0e7h, 0b9h
  db 08ch, 0d2h, 030h, 06eh, 0edh, 0b3h, 051h, 00fh
  db 04eh, 010h, 0f2h, 0ach, 02fh, 071h, 093h, 0cdh
  db 011h, 04fh, 0adh, 0f3h, 070h, 02eh, 0cch, 092h
  db 0d3h, 08dh, 06fh, 031h, 0b2h, 0ech, 00eh, 050h
  db 0afh, 0f1h, 013h, 04dh, 0ceh, 090h, 072h, 02ch
  db 06dh, 033h, 0d1h, 08fh, 00ch, 052h, 0b0h, 0eeh
  db 032h, 06ch, 08eh, 0d0h, 053h, 00dh, 0efh, 0b1h
  db 0f0h, 0aeh, 04ch, 012h, 091h, 0cfh, 02dh, 073h
  db 0cah, 094h, 076h, 028h, 0abh, 0f5h, 017h, 049h
  db 008h, 056h, 0b4h, 0eah, 069h, 037h, 0d5h, 08bh
  db 057h, 009h, 0ebh, 0b5h, 036h, 068h, 08ah, 0d4h
  db 095h, 0cbh, 029h, 077h, 0f4h, 0aah, 048h, 016h
  db 0e9h, 0b7h, 055h, 00bh, 088h, 0d6h, 034h, 06ah
  db 02bh, 075h, 097h, 0c9h, 04ah, 014h, 0f6h, 0a8h
  db 074h, 02ah, 0c8h, 096h, 015h, 04bh, 0a9h, 0f7h
  db 0b6h, 0e8h, 00ah, 054h, 0d7h, 089h, 06bh, 035h
;
;****************************************************************************
;
  end

[/code]

[code="asm"]

;
;****************************************************************************
;
;  Purpose:
; Calculate CRC-8 Values.  Uses The CCITT-8 Polynomial, Expressed As
; X^8 + X^5 + X^4 + 1
;
;  Date:
; 08/03/93
;
;  Author:
; John C. Wren
;
;  Modications:
; 02/04/97 - Added Description Fields For Archive
;
;  Processor:
; Generic 8031
;
;  Assembler:
; Avocet AVA51
;
;  Dependencies:
; None
;
;  Files:
; None
;
;  Philosophic:
; None
;
;****************************************************************************
;
;
;  Includes
;
;  %include "equates.inc"
  seg code
;
;****************************************************************************
;
;  Publics
;
  public CRC16_INIT
  public CRC16_ADD
  public CRC16_GET
;
  extrn UTIL_ADCAD
;
;****************************************************************************
;
;  Description:
; Initializes CRC Calculator.  Should Be Called To Reset The Running
; Value.
;
;  Entry Requirements:
; None
;
;  On Exit:
; None
;
;  Affected:
; None
;
;  Stack:
; 0 Bytes, Not Including Space Used By Called Routines
;
;  Comments:
; None
;
CRC16_INIT proc
  mov D_CRC16_HI,#0  ; Clear CRC16 High
  mov D_CRC16_LO,#0  ; Clear CRC16 Low
  ret    ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Description:
; Adds Value In Acc To Running CRC Total
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
;
;  On Exit:
; None
;
;  Affected:
; PSW.CY
;
;  Stack:
; 0 Bytes, Not Including Space Used By Called Routines
;
;  Comments:
; None
;
CRC16_ADD proc
  jmp CRC16_ADD_CALC  ; Use Calculation Method
  endproc
;
;****************************************************************************
;
;  Description:
; Returns The Accumulated CRC Value
;
;  Entry Requirements:
; None
;
;  On Exit:
; DPTR Has Accumulated CRC Value
;
;  Affected:
; DPTR
;
;  Stack:
; 0 Bytes, Not Including Space Used By Called Routines
;
;  Comments:
; None
;
CRC16_GET proc
  mov dph,D_CRC16_HI  ; Get CRC16 High
  mov dpl,D_CRC16_LO  ; Get CRC16 Low
  ret    ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Description:
; Calculates Value In Acc Into The Running CRC Total, Using The
; Calculation Method (Slower But Smaller).
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
;
;  On Exit:
; None
;
;  Affected:
; PSW.CY
;
;  Stack:
; 2 Bytes, Not Including Space Used By Called Routines
;
;  Comments:
; Must Use Register Bank 0.  The Routine Saves R0 By Pushing Location
; 0 (Since R0 Can't Be Pushed By Reference).  If Alternate Register
; Banks Need To Be Used, R0 Could Be Moved To Acc And Pushed.
;
CRC16_ADD_CALC proc
  push 0  ; Save R0
  push acc  ; Save Acc
  mov r0,#8  ; 8 Bits In A Byte
  xrl D_CRC16_HI,a ; HI ^= Data
l?p1  clr c  ; 0 Into Low Bit
  mov a,D_CRC16_LO ; D_CRC << 1
  rlc a  ; Shift Left
  mov D_CRC16_LO,a ; Store Back
  mov a,D_CRC16_HI ; Get High Byte
  rlc a  ; Shift Left
  mov D_CRC16_HI,a ; Store Back
  jnc l?p2  ; Skip If Bit 15 Wasn't Set
  xrl D_CRC16_HI,#10h ; XOR In Polynomial High
  xrl D_CRC16_LO,#21h ; XOR In Polynomial Low
l?p2  djnz r0,l?p1  ; Repeat R0 More Times
  pop acc  ; Recover Acc
  pop 0  ; Recover R0
  ret   ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Description:
; Calculates Value In Acc Into The Running CRC Total, Using The Table
; Method.  (Faster But Larger)
;
;  Entry Requirements:
; Acc Has Value To Add To CRC
;
;  On Exit:
; None
;
;  Affected:
; PSW.CY
;
;  Stack:
; 5 Bytes, Not Including Space Used By Called Routines
;
;  Comments:
; None
;
CRC16_ADD_TABLE proc
  push dph   ; Save DPH
  push dpl   ; Save DPL
  push acc   ; Save Acc
;
  mov dptr,#CRC16_DATA ; Point To Table
  xrl a,D_CRC16_HI  ; XOR High Of CRC With Character
  call UTIL_ADCAD  ; Add 'A' To 'DPTR'
  call UTIL_ADCAD  ; Add 'A' To 'DPTR' (Yes, Twice)
;
  clr a   ; Clear For MOVC
  movc a,@a+dptr  ; Get High Of Table Entry
  xrl a,D_CRC16_LO  ; XOR With Low
  mov D_CRC16_HI,a  ; Store To High
;
  mov a,#1   ; Get Low Byte
  movc a,@a+dptr  ; Get Low Of Table Entry
  mov D_CRC16_LO,a  ; Store To Low Of CRC
;
  pop acc   ; Recover Acc
  pop dpl   ; Recover DPL
  pop dph   ; Recover DPH
  ret    ; Return To Caller
  endproc
;
;****************************************************************************
;
;  Data For Table Method
;
CRC16_DATA dw 00000h, 01021h, 02042h, 03063h, 04084h, 050A5h, 060C6h, 070E7h
  dw 08108h, 09129h, 0A14Ah, 0B16Bh, 0C18Ch, 0D1ADh, 0E1CEh, 0F1EFh
  dw 01231h, 00210h, 03273h, 02252h, 052B5h, 04294h, 072F7h, 062D6h
  dw 09339h, 08318h, 0B37Bh, 0A35Ah, 0D3BDh, 0C39Ch, 0F3FFh, 0E3DEh
  dw 02462h, 03443h, 00420h, 01401h, 064E6h, 074C7h, 044A4h, 05485h
  dw 0A56Ah, 0B54Bh, 08528h, 09509h, 0E5EEh, 0F5CFh, 0C5ACh, 0D58Dh
  dw 03653h, 02672h, 01611h, 00630h, 076D7h, 066F6h, 05695h, 046B4h
  dw 0B75Bh, 0A77Ah, 09719h, 08738h, 0F7DFh, 0E7FEh, 0D79Dh, 0C7BCh
  dw 048C4h, 058E5h, 06886h, 078A7h, 00840h, 01861h, 02802h, 03823h
  dw 0C9CCh, 0D9EDh, 0E98Eh, 0F9AFh, 08948h, 09969h, 0A90Ah, 0B92Bh
  dw 05AF5h, 04AD4h, 07AB7h, 06A96h, 01A71h, 00A50h, 03A33h, 02A12h
  dw 0DBFDh, 0CBDCh, 0FBBFh, 0EB9Eh, 09B79h, 08B58h, 0BB3Bh, 0AB1Ah
  dw 06CA6h, 07C87h, 04CE4h, 05CC5h, 02C22h, 03C03h, 00C60h, 01C41h
  dw 0EDAEh, 0FD8Fh, 0CDECh, 0DDCDh, 0AD2Ah, 0BD0Bh, 08D68h, 09D49h
  dw 07E97h, 06EB6h, 05ED5h, 04EF4h, 03E13h, 02E32h, 01E51h, 00E70h
  dw 0FF9Fh, 0EFBEh, 0DFDDh, 0CFFCh, 0BF1Bh, 0AF3Ah, 09F59h, 08F78h
  dw 09188h, 081A9h, 0B1CAh, 0A1EBh, 0D10Ch, 0C12Dh, 0F14Eh, 0E16Fh
  dw 01080h, 000A1h, 030C2h, 020E3h, 05004h, 04025h, 07046h, 06067h
  dw 083B9h, 09398h, 0A3FBh, 0B3DAh, 0C33Dh, 0D31Ch, 0E37Fh, 0F35Eh
  dw 002B1h, 01290h, 022F3h, 032D2h, 04235h, 05214h, 06277h, 07256h
  dw 0B5EAh, 0A5CBh, 095A8h, 08589h, 0F56Eh, 0E54Fh, 0D52Ch, 0C50Dh
  dw 034E2h, 024C3h, 014A0h, 00481h, 07466h, 06447h, 05424h, 04405h
  dw 0A7DBh, 0B7FAh, 08799h, 097B8h, 0E75Fh, 0F77Eh, 0C71Dh, 0D73Ch
  dw 026D3h, 036F2h, 00691h, 016B0h, 06657h, 07676h, 04615h, 05634h
  dw 0D94Ch, 0C96Dh, 0F90Eh, 0E92Fh, 099C8h, 089E9h, 0B98Ah, 0A9ABh
  dw 05844h, 04865h, 07806h, 06827h, 018C0h, 008E1h, 03882h, 028A3h
  dw 0CB7Dh, 0DB5Ch, 0EB3Fh, 0FB1Eh, 08BF9h, 09BD8h, 0ABBBh, 0BB9Ah
  dw 04A75h, 05A54h, 06A37h, 07A16h, 00AF1h, 01AD0h, 02AB3h, 03A92h
  dw 0FD2Eh, 0ED0Fh, 0DD6Ch, 0CD4Dh, 0BDAAh, 0AD8Bh, 09DE8h, 08DC9h
  dw 07C26h, 06C07h, 05C64h, 04C45h, 03CA2h, 02C83h, 01CE0h, 00CC1h
  dw 0EF1Fh, 0FF3Eh, 0CF5Dh, 0DF7Ch, 0AF9Bh, 0BFBAh, 08FD9h, 09FF8h
  dw 06E17h, 07E36h, 04E55h, 05E74h, 02E93h, 03EB2h, 00ED1h, 01EF0h
;
;****************************************************************************
;
;  Data Area
;
  seg data
D_CRC16_HI ds 1
D_CRC16_LO ds 1
;
;****************************************************************************
;
  end

[/code]


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