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Dan Henry
08/12/07 17:41
Read: 655 times
Boulder, Co
U.s.a.


 
#143133 - No reason to hide the excreted code
Responding to: Jan Waclawek's previous message
             ; FUNCTION _CRCNib (BEGIN)
                                           ; SOURCE LINE # 33
;---- Variable 'b' assigned to Register 'R7' ----
                                           ; SOURCE LINE # 34
                                           ; SOURCE LINE # 35
0000 EF                MOV     A,R7
0001 6200        R     XRL     CRCLo,A
                                           ; SOURCE LINE # 36
0003 AF00        R     MOV     R7,CRCHi
                                           ; SOURCE LINE # 37
0005 E500        R     MOV     A,CRCLo
0007 C4                SWAP    A
0008 54F0              ANL     A,#0F0H
000A 6500        R     XRL     A,CRCLo
000C F500        R     MOV     CRCHi,A
                                           ; SOURCE LINE # 38
000E 8F00        R     MOV     CRCLo,R7
                                           ; SOURCE LINE # 39
0010 C4                SWAP    A
0011 540F              ANL     A,#0FH
0013 6200        R     XRL     CRCLo,A
                                           ; SOURCE LINE # 40
0015 C3                CLR     C
0016 13                RRC     A
0017 6500        R     XRL     A,CRCHi
0019 FF                MOV     R7,A
                                           ; SOURCE LINE # 41
001A E500        R     MOV     A,CRCHi
001C 33                RLC     A
001D 33                RLC     A
001E 33                RLC     A
001F 54F8              ANL     A,#0F8H
0021 6200        R     XRL     CRCLo,A
                                           ; SOURCE LINE # 42
0023 8F00        R     MOV     CRCHi,R7
                                           ; SOURCE LINE # 43
0025 22                RET     


List of 32 messages in thread
TopicAuthorDate
CRC16 CCITT - What a challenge!      Jan Waclawek      08/06/07 13:08      
   Have you seen this?      Richard Erlacher      08/06/07 17:40      
      Of course!      Jan Waclawek      08/07/07 02:36      
         Balance      Russ Cooper      08/07/07 07:16      
            I know, Russ,      Jan Waclawek      08/07/07 07:53      
         Code? What code?      Russ Cooper      08/07/07 07:24      
            in the code library - look to the left column      Jan Waclawek      08/07/07 07:37      
               Thanks! I missed that note in the first post.      Russ Cooper      08/07/07 08:37      
   I need a hint      Russ Cooper      08/11/07 00:56      
      write down the bits      Jan Waclawek      08/11/07 01:22      
         Thanks for the hint      Russ Cooper      08/12/07 11:12      
            Your observations plus a comparison in C      Dan Henry      08/12/07 11:58      
               The rest of the story ...      Russ Cooper      08/12/07 16:43      
                  Compilers, but Keil C51 8.09 for the stated 28~      Dan Henry      08/12/07 17:04      
                  and this processes only a nibble, isn't it...      Jan Waclawek      08/12/07 23:27      
                     No, it process the entire byte.      Dan Henry      08/13/07 12:59      
                        now it\'s my pencil time...      Jan Waclawek      08/13/07 13:40      
                           FYFI      Dan Henry      08/13/07 14:40      
                              Clarification re: 8-bit optimized term      Dan Henry      08/13/07 17:46      
                              on optimisation      Jan Waclawek      08/14/07 02:56      
                                 Jan's optimization      Dan Henry      08/14/07 07:16      
                                    Re: on optimization      Dan Henry      08/19/07 09:18      
                                       Can you please be more specific?      Jan Waclawek      08/19/07 13:56      
                                          More specifically ...      Dan Henry      08/25/07 15:10      
            and what      Jan Waclawek      08/12/07 23:27      
               More on checksums        Russ Cooper      08/18/07 09:59      
   No reason to hide the excreted code      Dan Henry      08/12/07 17:41      
      Excreted code needs context like any other code      Dan Henry      08/12/07 19:01      
   One More Comment      Michael Karas      08/13/07 02:45      
      ... and a marginal remark ...      Jan Waclawek      08/13/07 07:02      
         Init all ones frequently specified      Dan Henry      08/13/07 13:06      
   18 cycles      Jan Waclawek      08/16/07 08:16      

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