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???
08/11/06 13:41
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 		 #122044 - CRC time
Responding to: ???'s previous message
Anyway I think the CRC is cumbersome and makes the encoder too slow for real time applications. But again how slow is slow.
In most cases I do the CRC in the ISR, it is about 11 instructions per byte using table lookup (no ISR overload) but if you do the CRC as a "stand alone after the fact" routine, it can, indeed, be "cumbersome". When you get the dats, I hope the CRC can be done by table lookup, otherwise you need HORSEPOWER (e.g. SILabs f12x)

Erik


List of 36 messages in thread
TopicAuthorDate
5 bit CRC polynomial            01/01/70 00:00      
   there are several            01/01/70 00:00      
   what does "no success" mean?            01/01/70 00:00      
      He said            01/01/70 00:00      
         maybe we need a new 'forum' where            01/01/70 00:00      
      They said            01/01/70 00:00      
         This must be a very smart shaft encoder            01/01/70 00:00      
            competitor like Kuebler            01/01/70 00:00      
         This must be a very smart shaft encoder            01/01/70 00:00      
         Brute force it.            01/01/70 00:00      
            Yes this is what we were doing            01/01/70 00:00      
   can you find it in the pascal here? -- Kai            01/01/70 00:00      
      zyklische Redundanzprüfung            01/01/70 00:00      
      I searched all their site            01/01/70 00:00      
         did you search the pascal code examples            01/01/70 00:00      
            Where?            01/01/70 00:00      
               I did not look at it all, but there is much here            01/01/70 00:00      
                  I downloaded them all            01/01/70 00:00      
                     what about all the .pas            01/01/70 00:00      
      Found a document name            01/01/70 00:00      
         I feel your pain            01/01/70 00:00      
            This is how we get experienced            01/01/70 00:00      
               CRC time            01/01/70 00:00      
                  FPGA option            01/01/70 00:00      
                  SiLabs            01/01/70 00:00      
               have you seen this?            01/01/70 00:00      
                  Maybe it is X^5+X^4+X^3+X^2+X+1            01/01/70 00:00      
   rather than all that processing            01/01/70 00:00      
      The thing is            01/01/70 00:00      
         USB 5bit CRC            01/01/70 00:00      
         implementing other crc using crc package            01/01/70 00:00      
            impressive            01/01/70 00:00      
   rather than all that processing            01/01/70 00:00      
   Initial value?            01/01/70 00:00      
      and the final value            01/01/70 00:00      
   Friends            01/01/70 00:00      

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