CAN bus ISO 15675

Developer topics relating to software that logs data from ECUs

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CAN bus ISO 15675

Postby wech » Mon Jan 14, 2008 11:38 pm

Hello everybody,
there's anyone who's trying to develop the interface of protcol ISO 15765 for the communication of car's Ecu with a tester tool?
there's anyone who know the CAN bus for automotive applications?
thank you
Wech
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Postby Evo4Mad » Fri Feb 15, 2008 9:30 pm

yes, EvoScan will support it soon.
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Postby Evo4Mad » Fri Feb 15, 2008 9:31 pm

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Postby wech » Sat Feb 16, 2008 2:39 am

Yes I know Evoscan but I'm not interested in buying a scantool, I'm interested in building my own scantool...I kept an atmel microcontroller and all the ISO standards and now I'm developing the communication protocols...
it's a difficult job but I thought that it could be worst before start programming
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Postby Jon [in CT] » Sat Feb 16, 2008 10:13 am

I would just use the US$29.50 chip described at http://www.obdscan.net/APEX.pdf and let it handle all the communication protocol details. It will greatly simplify your project.
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Postby Evo4Mad » Sun Feb 17, 2008 3:08 am

hmm sounds like a lot of work to me..

if you want cables I can sell you premade ELM327 CAN USB cables for as low as $35 depending on qty.

The EvoScan software is only $25 (cheap comapred to the 20,000 lines of code and 1000 hours gone into it) and the USB cables are cheaper than trying to make a single cable on your own..

i cant understand the 400hrs+ it would take you to make your own if you know what you are doing :) It took me 24mths just to make one, and it didn't work as good as the ELM327 Usb cable :) lol.
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Postby Evo4Mad » Sun Feb 17, 2008 3:17 am

there is already thousands of scantools, why dont you do some ecu reflashing tools? they are hard to come by, and would be worth the investigation if you are going to spend that much time on it.
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Postby wech » Sun Feb 17, 2008 4:14 am

dear Evo, that's not my hobby, but it's my final project for the university...
I have to improve a communication between the central Ecu of the engine and a special Ecu for the gas-fuel system that's produced by the company for which I work.
I have to ask few parameter from the central Ecu, so the job is very simplified.
I studied the KWP2000 protocol (very simple) and the CANbus protocol (very difficult) for automotive.
the atmel microcontroller is a very good one, it's cheap (4 euro) and it has got a can controller unit. it's programmable in C++, and doesn't need any particular electronic enviroment to run.
So, if you have or if you want some informations about the communication protocol please contact me!!
best regards
Matteo
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Postby Evo4Mad » Sun Feb 17, 2008 4:31 am

ok, you said it was for a scantool above, that sounds a lot different.

yeah for CAN schematics check out the elektor magazine that featured the ATMEL OBDII CAN logger. I cant remember the issue number.
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Postby wech » Tue Feb 19, 2008 1:40 am

I will search for it.
the first obstacle will be setting the microcontroller's registers for can implementation. over 20 register to set!
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