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Dan Henry
08/13/07 14:40
Read: 746 times
Boulder, Co
U.s.a.


 
#143230 - FYFI
Responding to: Jan Waclawek's previous message
I suspect you'd like to work things out on paper first, so for your future information, I refer you to this document:

http://www.danlhenry.com/hdlc/hdlcbcc.pdf

That document's section 2.2.5 specifies the 16-bit FCS (CRC) used by the international standard HDLC protocol. In section 4.1, you will find various FCS implementations. The code I posted in your thread here was a slight optimization of Fcs16_b(). Fcs16_b() is an 8-bit optimized version of Fcs16_a(). I refer you to Fcs16_a() because it shows the algorithm in a 'simpler' form for comparison to your pencil and paper work.

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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