[Ovmsdev] ACC and others

Tom Saxton tom at idleloop.com
Sat Aug 17 04:42:25 HKT 2013


Wow, great stuff. Can't wait to have this all working!

I built and installed the latest version and tried to do a cooldown, but
couldn't get it to work.

I arrived home with the batteries at 98F (37C), flashed the OVMS device, and
sent a cooldown command. Nothing.

I set feature #13 to 255 and sent cooldown again. Nothing.

I took a look at the code, set param 15 to "27,45", sent cooldown again.

I look at the code some more, so that the car had to be "on" for cooldown to
work, so I went out and opened the driver's door to wake the car up. Battery
pack still at 98F. Sent cooldown again. Nothing.

I do have feature 15 (CAN Write) set to 1. The OVMS app lists the firmware
version as "2.3.3/TR/V1".

As I wanted to cool the batteries and then do a change, I manually kicked
off a 12A Range mode charge.

What should I try next time the batteries are hot?


on 8/15/13 6:55 AM, Mark Webb-Johnson wrote:

> Wow, let's not do that again.
> I just spent the past two weeks trying to debug a problem where my car module
> kept rebooting. The debug crash log showed it seemed to be identical to a
> normal power-on start. Seems like the module rebooted itself a dozen times a
> day. After trying everything - more than a dozen firmware changes painfully
> loaded into the car module, I finally found the problem:  the module was
> rebooting, it was just incorrectly reporting a reboot every time the cellular
> signal recovered. Good grief.
> Anyway, back on track again now.
> Today, I've pushed to github my backlog of 36 commits, totalling 1.5MB! This
> makes the first 'alpha' release of v2.5 code. A summary of the (extensive)
> changes:
> Tesla Roadster Experimental Speedo
> No longer experimental. Now on bit#0 of permanent feature #13. Old feature #0
> no longer used.
> Drive and Charge logging
> Server as well as vehicle changes made to support this. Setting bit#1 of
> permanent feature #13 will turn on logging of drives. Setting bit#2 of
> permanent feature #13 will turn on logging of charges. If enabled, at the end
> of each drive/charge the logging system will attempt to upload a *-Log-Drive
> or *-Log-Charge record with details on the drive/charge. It can store up to 6
> such records without server connectivity. The records themselves can be
> downloaded as historical data using either the HTTP or OVMS protocol APIs. To
> implement this, a new 'h' style of historical data submission has been
> supported by the server - this allows for acknowledgement of successful data
> reception by the server, as well as a time offset for cases where the data
> cannot be immediately transmitted.
> Cooldown
> Core support has been added for 'cool down' charges, and implemented in the
> Tesla Roadster module. Cooldowns can be initiated by the 'COOLDOWN' SMS
> message, or by server command #25.
> Tesla Roadster event notification
> A few changes have been made to the Tesla Roadster module to try to make it
> notify the server of major events immediately (such as charge mode changes,
> charge limit changes, etc).
> Server support for Authentication failures
> The server code has been extended to send a PUSH notification in the event a
> vehicle authentication fails. The server will also send another PUSH
> notification if the vehicle subsequently authenticates successfully.
> Distance utility function
> Courtesy of Tom, a distance utility function to calculate the distance between
> two GPS locations and tell if they are closer than a pre-set limit.
> NET fixes
> Added a few more checkpoints and sanity checks for NET layer data, to try to
> avoid crashes and overflows.
> Debug Crash Reason reporting
> Bug fix to avoid duplicate reports of debug crashes every time the server
> connection is made. As a side-effect, normal first-time boot-ups will no
> longer be reported (by design).
> Stub ACC implementation
> I've done a lot of work on ACC in my own branch, but not committed to head,
> yet. I need some more time to do further testing before I'm ready to release.
> For the moment, there is a minimal implementation the does the ACC location
> mapping, and is capable of seeing if the car is within range of an ACC
> location. You can also configure the ACC locations and parameters. More on
> this will come with v2.5.2.
> Documentation
> I've updated the Tesla Roadster user guide, as well as OVMS Protocol guide,
> for the above.
> I haven't built binary firmware for this yet, as it is so new and raw. It is
> running in my car, and now seems stable, but needs more testing before
> prime-time release. If you want to try it, you'll need to build from source.
> Then, set feature #13 to 255 (to enable all opt-in features) and you should
> get a digital speedo (Tesla Roadster v2.x cars only) as well as logging to the
> server of both drives and charges.
> I'm over the hump now, and hopefully v2.5.2 can come within the next week.
> Regards, Mark.
> On 5 Aug, 2013, at 12:38 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
>> Just a short note on progress.
>> I managed to get a lot done over the weekend. Working with Tom on some misc
>> functions for ACC, and all looks good so far. Basic ACC location management
>> is done, and I've worked out a way of using base64 to encode the ACC
>> structures into our limited 32byte parameters. Seems to work quite well -
>> very lightweight (we already have base64 for the comms protocol), and very
>> expandable.
>> I'm now just trying to pull everything together to get cooldown working. Once
>> that is working, I'll commit (even in that unfinished form). Logging (drive
>> and charge) is already done, and part of this. Flash space is getting
>> concerning (approaching 95% now, for experimental with all vehicles), so
>> we'll have to address that once ACC is out.
>> I'm getting a rather large backlog of other requests now (put aside due to
>> ACC work, trip to USA for TESLIVE, and horrendous day job hours). Once the
>> basic ACC is committed, I'll be able to spend some time to try to work
>> through that. Apologies for the delays (to anyone waiting for me).
>> Regards, Mark.
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