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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: 9,538
- 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
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: 9,538
- Website
Re: Something about pyramid
Would you make a dump of the data signal and share via sendspace?
lf search
data save nnn.pm3Offline
#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: 9,538
- 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!Offline
#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: 9,538
- 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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