GM Lan Single Wire CAN Bus Sniffing

[jezzab]

Another good one I personally use is PUTTY. http://the.earth.li/~sgtatham/putty/lat ... /putty.exe

[abodah]

thx jezzab, I downloaded PUTTY, and waiting for the hardware to arrive in a couple of days.
If please can paste or send me the settings of PUTTY for the ELM327 modified bluetooth adapter (every little setting please).
Thanks

[msenj]

Well, things have finally settled down for me.

I'll be placing my order with sparkfun shortly, and when my CAN shield and arduino arrive, I'll start contributing again.

I've missed this place!

[ZerOne]

Your BACK !!!!!!!!!!
Yay !!!!!!

Fantastic to hear things have settled down a bit for you !!!
Let me know if there is anything I can help you with !

Abodah, I will have a play tonight with Putty on Windows, and grab those settings for you...

Cheers
Matti

[ZerOne]

Putty Information.

1) Download Putty from here...
http://www.chiark.greenend.org.uk/~sgta ... nload.html

2) Open Putty and select Serial from the Connection Type
3) Enter 33000 for the speed
4) Enter the COM Port that you bluetooth device is using.
5) Enter Bluetooth Dongle in the Saved Sessions Box
6) Click On save to save these settings.
7) Click on Open to open a terminal session...

Thats pretty much it...
If you type AT, and you get something like ?, then you are ready to try connecting to the car, and playing around.

Cheers

[abodah]

That is a great help from you, thank you so much

[abodah]

Hello Again.

I assembled the circuit and connected it into the ELM327 adapter, plugged it in the ODB2 Connector in my car.
Added it as bluetooth device in my windows7 64 bit. Now it has 2 com ports, 3 and 4.
I tried to connect to one of them, I typed AT and got the "?"
Then I typed the setting commands then ATMA, and got nothing. Then, when I ever I press any key, I got the word " Stopped".
I tried the other bluetooth com port, and couldn't type no commands.

My questions, is there some way to make sure that the TH8056 and its circuit is working well?
Which com port sould I connect to?

Thanks everyone

[ZerOne]

Hi abodah.

It loos like you can communicate to the elm chip fine, which is good news.

The ATMA command is monitor all, which means it is telling the elm chip to sit there, and listen to the can bus for any communications, and display them.
When you press the enter key, then it's telling the elm chip to stop listening, as you are going to send it some more at commands.

The next step is to configure the elm chip for the single wire bus.
(these commands can be found on the first page of this thread).

Once you do this, connect to the odb port, type at ma, and turn the ignition switch to on, and watch the data flow.
(you will probably get buffer over runs, but that is ok, the reason for the buffer overruns is that there is too much data for the elm to display).
The way around this is to tell the elm chip to filter the data, so as it displays only what you are interested in....

Let us know how you go.

[ZerOne]

Lifted from the GTOSoft website,
http://www.gtosoft.com

the ELM327 can be finagled into 33.3k mode for SWCAN communications by using the USER B protocol.
Here’s the list of commands from my notes that I use when typing directly to the ELM327 which has been attached to an 8055/8056 chip:

Code: Select all

AT WS
AT L1
AT H1
AT PP 2C SV 40
AT PP 2C ON
AT PP 2D SV 0F
AT PP 2D ON
AT PP 2A OFF
AT WS
AT SP B
AT R0
AT CAF 0
AT L1
AT H1
ATMA (monitor the bus)

[abodah]

Hello ZeroOne.
As I said, I already typed the setting commands (copied them one by one from Steve's G8 Blog, http://g8gt.blogspot.com/2012/04/advent ... rt-ii.html):

AT WS - Quick Reset of device
AT L1 - Turn on LineFeeds after each line
AT H1 - Show Complete message including headers
AT PP 2C SV 40 - Set Programmable Parameter '2C' to value 0x40
AT PP 2C ON - Turn Programmable Parameter '2C' ON
AT PP 2D SV 0F - Set Programmable Parameter '2D' to value 0x0F
AT PP 2D ON - Turn Programmable Parameter '2D' ON
AT PP 2A OFF - Turn Programmable Parameters '2A' OFF
AT WS - Quick Reset to restart with the above settings
AT SP B - use 'User Protocol B'
AT R0 - Do not wait for responses when sending commands
AT CAF 0 - Turn off CAN AutoFormatting
AT L1 - Turn on LineFeeds after each line
AT H1 - Show Complete message including headers
ATMA - Enter Bus Monitoring mode

The results are:
One Message "ELM327 v1.5".
"OK" Messages after each command.
When typing ATMA, nothing happens at all. then when I press any key after that, "Stopped" appears in my terminal window.
I guess the ELM327 is working fine on its own. But I suspect the TH8056 circuit isn't.
Thanks