[Ovmsdev] Volt/Ampera CAN Logs
mikeljo at mac.com
mikeljo at mac.com
Thu Jun 28 20:29:45 HKT 2012
yesterday i got some Logs.
I do one log for each action. Lock/unlock car, open/close door, Remote start, Plugin/remove Charging Plug, .....
I do the action in 5 second interval.
I think i found some IDs.
And i found something interesting: Some IDs cycle 4 with 4 times Blocks. That mean there is a counter or an adress field in one data field that repeats after 4 times. It counts like 10 20 30 40, FF FE FD FC, or...... the rest of the data fields change there value.
Can anybody confirm?
Didi anybody see this before?
I can see this after sort the Logs (Excel). As Sort field i use the ID. So i can see the value changing over time.
Am 11.06.2012 um 16:39 schrieb Michael Jochum:
> today i got some Logs from both Expansion Buses (DS (Chassis Expansion), RH(High Voltage Powertrain Expansion), Pin 12 and 13). Made an Cable for this.
> The trc are the time stamped Logs. The txt show only the IDs, the last Values and some comments from me.
> Unfortunately both stops after 5-10 seconds the car switched of.
> Car stands still. Clear sky view.
> <20120612-Michas Volt Logs>
> Next i made a Cable for the RH High Voltage Energy Management BUS (Pin 3 and 11) and than a cable for the Low Speed GMLAN (SWCAN ~33.3kbps) - Body Electrical Services Only at Pin 1 DS.
> Am 02.06.2012 um 18:45 schrieb R. Scott Perry:
>> Hi Michael,
>> I cannot find the data from 32A does not appear elsewhere in the logs.
>> My guess is that OnStar uses a separate GPS system than the navigation, and OnStar sends the latitude/longitude on 32A, and the navigation system sends it on a different bus (or, hopefully, on the same bus but with a different CAN ID).
>> I'll take a look at your log file, and see if I can find the GPS information, if it is in there.
>> On 6/2/2012 7:16 AM, Michael Jochum wrote:
>>> Hi Scott,
>>> can you check that the data from ID 32A is somewhere else in your logs?
>>> in mine 32A is always zero. We have here no OnStar. But i have the full package including Navigation.
>>>> The latitude/longitude conversion is almost the same as what you have for the Tesla, with two exceptions -- changing the 2048 to 1000, as noted, and the accounting for negative numbers is different. It seems that the number the Volt supplies is a 31-bit signed integer. The easiest way to handle that, I think, would be to add "latlon = latlon<< 1;" before checking for<0, and then "latlon = latlon>> 1;" afterwards. Running the code you have with those two changes seems to work fine.
>>>> The bad news is that I have checked all my log files (I have been logging almost all the time I have driven for about 8 months now), and the CAN ID 32A (latitude/longitude) has never shown all zeroes. If the GPS data is unobtainable, I believe the car reports the most recent reading. The GPS data comes from the OnStar system, so I am thinking it may only provide the data if the OnStar service has been activated, which could be a problem for owners outside of U.S/Canada.
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