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#1 2015-05-30 18:12:17

Sentinel
Contributor
Registered: 2012-11-26
Posts: 182

PCF7953P 4byte IDE

I was emulating the work of the transponder (manchester 40 bit) choose 5 bytes CRC(?)  It is not CRC8 (((

00000000 A6
00000001 A1
00000002 A8
00000003 AF

00000004 BA
00000005 BD
00000006 B4
00000007 B3

00000008 98
00000009 99
0000000A 90
0000000B 97

0000000C 82
0000000D 85
0000000E 8C
0000000F 8B

00000100 B3
00010000 CD
01000000 B0

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#2 2015-05-31 19:13:49

iceman
Administrator
Registered: 2013-04-25
Posts: 6,654
Website

Re: PCF7953P 4byte IDE

it's in these moments my experimental work on implementing the reveng engine into the PM3 client would be at great value.


If you feel the love,  https://www.patreon.com/iceman1001

modhex(hkhehghthbhudcfcdchkigiehgduiehg)

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#3 2015-05-31 19:46:25

Sentinel
Contributor
Registered: 2012-11-26
Posts: 182

Re: PCF7953P 4byte IDE

This task was easy)
USE:   CRC-8-CCITT    (x8  + x2  + x + 1)
https://ghsi.de/CRC/index.php?Polynom=1 … e=01000000
REZALT :  0x16   
Final XOR = 0xA6
CRC=0xB0

https://ghsi.de/CRC/index.php?Polynom=1 … e=00010000
REZALT :  0x6B   
Final XOR = 0xA6
CRC=0xCD

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#4 2015-05-31 20:36:58

Sentinel
Contributor
Registered: 2012-11-26
Posts: 182

Re: PCF7953P 4byte IDE

5 bit request and 40bit answer + preamble
1433100848_request002.jpg

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#5 2016-02-20 09:27:32

reks13
Contributor
Registered: 2010-12-10
Posts: 16

Re: PCF7953P 4byte IDE

Do you know how to change id of this chip?  hitag 2  was easy but pro cant change it in config.

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