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#1 2016-11-14 12:23:11

rookieatall
Contributor
Registered: 2016-07-31
Posts: 25

Something about pyramid

Pyramid ID Found - BitLength: 26, FC: 79, Card: 5321 - Wiegand: 9e2992, Raw: 000101010101010101010149f1a7253d         
Checksum 3d failed - should have been 64   

Why this happen and how to fix?

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#2 2016-11-14 14:43:12

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Something about pyramid

which version of pm3 are you using?

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#3 2016-11-14 17:11:47

rookieatall
Contributor
Registered: 2016-07-31
Posts: 25

Re: Something about pyramid

iceman wrote:

which version of pm3 are you using?

Your latest.

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#4 2016-11-14 18:08:30

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Something about pyramid

Would you make a dump of the data signal and share via sendspace?

lf search
data save nnn.pm3

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#5 2016-11-14 19:19:15

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Something about pyramid

3D is the correct checksum.  it is a valid 26 bit pyramid tag.

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#6 2016-11-14 19:41:26

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Something about pyramid

I made a clone from yr FC/CN.   I'm pretty sure you don't have my last version.   

pm3 --> lf pyr clone 79 5321
Preparing to clone Farpointe/Pyramid to T55x7 with Facility Code: 79, Card Number: 5321
Blk | Data
----+------------
 00 | 00107080
 01 | 00010101
 02 | 01010101
 03 | 01010149
 04 | f1a72564
pm3 --> lf se
Reading 30000 bytes from device memory

Data fetched
Samples @ 8 bits/smpl, decimation 1:1
NOTE: some demods output possible binary
  if it finds something that looks like a tag
False Positives ARE possible


Checking for known tags:

Pyramid ID Found - BitLength: 26, FC: 79, Card: 5321 - Wiegand: 9e2992, Raw: 000101010101010101010149f1a72564
Checksum 64 passed

Valid Pyramid ID Found!

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#7 2016-11-14 20:50:01

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Something about pyramid

@iceman, i think your checksum calculation is flawed. 64 is not the correct checksum

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#8 2016-11-14 20:56:57

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Something about pyramid

i confirmed with my fork the checksum is correctly calculated at 3D  (original poster's value)  NOT 64 (iceman's fork)

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#9 2016-11-14 21:43:22

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Something about pyramid

You were right,  that was a faulty call inside the crc algo (from my legic crc experiments)  Thanks for pointing out and verifing it.
I've pushed the fix to my fork. 

recompile your client and it should work just fine

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