CRC generator problem

[JÞB]

Now I'll mention my first clue that some engineer had trouble speaking to the tech writer.  STX is not 7F.  Check your ASCII tabels people.

[crossrulz]

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@JÞB wrote:

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@crossrulz wrote:

This seems to work...

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I have no Idea how you reverse engineerd that!  no XOR between Data In[i] and Remainder Polynomial.  Yeah, that's not a "CRC" in a strict sense.  but probably what got implemented.

My hats off to you my friend 

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Actually, that is the true CRC.  I have had that VI sitting around for many years (as in around 7 years now).  All but a few that I have seen on these forums follow this paradim perfectly, with just a few parameters for variations.  I used this site for reference when I originally made up my CRC library: http://zorc.breitbandkatze.de/crc.html

[JÞB]

That just points out the problem.  

You cannot recover the corrupted Data without adhering to the math of a CRC.  

[crossrulz]

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Jeff·Þ·Bohrer wrote:

You cannot recover the corrupted Data without adhering to the math of a CRC.  

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Correct.  A CRC is nothing but a fancy parity check (used to verify the data is correct).  If you want to recover data, that requires something like Reed-Solomon and/or Hamming algorithms.  Most things just use the CRC and report an error if the check failed.

[JÞB]

Exactly. Yet, claiming its a CRC is disegnuios. It fouls up developers.

[SuperbrainBug]

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@crossrulz wrote:

This seems to work...

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This seems to be it!!

I tried to recreate this from picture but unsuccessfully. Can you please post vi (I'm using LV2010)?

[crossrulz · Accepted solution]

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SuperbrainBug wrote:

I tried to recreate this from picture but unsuccessfully. Can you please post vi (I'm using LV2010)?

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Sure...

[SuperbrainBug]

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@crossrulz wrote:

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SuperbrainBug wrote:

I tried to recreate this from picture but unsuccessfully. Can you please post vi (I'm using LV2010)?

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Sure...

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I works! I want to thank everyone for help especially to crossrulz.