NefMoto > Technical > Cluster and Immobilizer (Moderator: ddillenger) > MED 17 , EDC 17 EEPROM CHECKSUM
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Author Topic: MED 17 , EDC 17 EEPROM CHECKSUM  (Read 102417 times)
obdflasher
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« on: April 02, 2013, 08:26:26 PM »
Working on edc17 eeprom crc.

Looking for serious guy who has experience with crc algo's

Have much and good info.
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Chiptuning Agri
ecutuners
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« Reply #1 on: April 09, 2013, 05:06:17 AM »
i can make all edc17 / med17 eeprom checksum

gttuning2009@yahoo.co.uk

Regards
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obdflasher
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« Reply #2 on: January 17, 2014, 05:49:39 PM »
Problem solved crc 16 , 32 .....
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Chiptuning Agri
chli1976
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« Reply #3 on: January 18, 2014, 12:56:03 AM »
Quote from: obdflasher on January 17, 2014, 05:49:39 PM
Problem solved crc 16 , 32 .....

Can we get more infos?
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ecufix
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« Reply #4 on: January 22, 2014, 06:06:09 AM »
Can we get more infos? no man answer ? Grin
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yas200979
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« Reply #5 on: January 30, 2014, 01:21:03 AM »
Hello
i can make all edc17 / med17 eeprom checksum
immo off med17/edc17

info@dpfoff.ru
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ozzy_rp
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« Reply #6 on: September 08, 2015, 01:12:00 AM »
All eeprom divided to blocks with 0x80 size
offsets:
0x00 - block id (half word)
0x02 - CS1 (half word)
0x04 - block revision Huh
0x08 - data
0x7C - CS2 (word)
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MED17/EDC17 Reverse engineering
conversion sgo and frf to bin https://osotec.com/
H2Deetoo
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« Reply #7 on: September 10, 2015, 03:19:51 AM »
Thanks for info.

With word you mean 16bit or 32bit ?
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ozzy_rp
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« Reply #8 on: September 10, 2015, 07:22:33 AM »
Half word - 16 bit
Word - 32 bit

And list Block id from EDC17 eeprom:
1,8,9,A,B,C,1A,1B,1C,1D,1E,1F,2A,2B,2C
2D,2E,2F,3A,3B,3C,3D,3D,3E,3F,17,18,19
20,21,22,23,24,25,26,27,28,29,30,31,32
33,34,35,36,37,38,39,40,41,42,43,44,45
46,47,48,49,CC00
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MED17/EDC17 Reverse engineering
conversion sgo and frf to bin https://osotec.com/
H2Deetoo
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« Reply #9 on: September 11, 2015, 02:33:34 AM »
Thanks for specifying that!
For me (in programming) it is common for a word to be 16 bit ;-)


Rgs H2Deetoo
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ozzy_rp
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« Reply #10 on: September 11, 2015, 02:55:20 AM »
In TriCore asm another look at it Smiley
Size given in asm mnemonic.
Like this:
ld.hu           d15, [a12]2
extr.u          d2, d2, #0, #0x10
jne16           d15, d2, loc_8013AD6A ; Bad CRC
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MED17/EDC17 Reverse engineering
conversion sgo and frf to bin https://osotec.com/
ozzy_rp
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« Reply #11 on: September 24, 2015, 12:28:13 PM »
Next update Smiley


Algorithm for CS1:
data from - 0x04
leight - 0x7C
CS calculated with Tricore internal CRC32 and low half word - CS1
Inicial value - block id


unsigned long crc_buffer(unsigned long crc, const unsigned long *p, unsigned long sz)
{
   const unsigned long poly = 0xEDB88320;
   unsigned long tmp1, tmp2;

   while(sz--)
   {
      tmp1 = 0;
      tmp2 = crc & poly;
      for(int i = 0; i <=31; i++ )
      tmp1 ^= ((tmp2 >> i) & 1);
      crc = *p++ ^ ((crc << 1) | tmp1) ;
   }
   return crc;
}
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MED17/EDC17 Reverse engineering
conversion sgo and frf to bin https://osotec.com/
totalfree
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« Reply #12 on: December 26, 2015, 07:18:59 AM »
Blocks is more.
How to calculate the checksum?
« Last Edit: May 23, 2016, 10:00:11 PM by totalfree » Logged
dream3R
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« Reply #13 on: December 27, 2015, 11:04:27 PM »
Quote from: ozzy_rp on September 24, 2015, 12:28:13 PM
Next update Smiley


Algorithm for CS1:
data from - 0x04
leight - 0x7C
CS calculated with Tricore internal CRC32 and low half word - CS1
Inicial value - block id


unsigned long crc_buffer(unsigned long crc, const unsigned long *p, unsigned long sz)
{
   const unsigned long poly = 0xEDB88320;
   unsigned long tmp1, tmp2;

   while(sz--)
   {
      tmp1 = 0;
      tmp2 = crc & poly;
      for(int i = 0; i <=31; i++ )
      tmp1 ^= ((tmp2 >> i) & 1);
      crc = *p++ ^ ((crc << 1) | tmp1) ;
   }
   return crc;
}




Good job!
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How to work out values from an A2L Smiley

http://nefariousmotorsports.com/forum/index.php?topic=5525.msg52371#msg52371


Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

noobs read this before asking http://nefariousmotorsports.com/forum/index.php?topic=9014.0title=


ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID
neuro
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WWW
« Reply #14 on: January 02, 2016, 11:44:19 AM »
or use immoff17 https://www.youtube.com/watch?v=BLv68_2x_1g


=P
« Last Edit: January 07, 2016, 06:31:29 AM by neuro » Logged
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