[Ovmsdev] OVMS v3

Matt Beard OVMS smvo at mxf.org.uk
Fri Jun 20 01:29:48 HKT 2014

That carknow.me unit looks like it ticks a lot of boxes - I wonder what the
cost will be!


On 19 June 2014 17:29, phil hochstetler <phil.hochstetler at gmail.com> wrote:

> This is an interesting thread.  I can see the advantage of newer, more
> flexible and more powerful hardware, and the need to move on from the AT&T
> 2G shutdown.
> In looking around, I found this website, http://www.carknow.me/.  They
> are working on making an open source ARM7 based hardware platform
> integrated into the cloud.
> I just thought I would pass this on.
> Phil H.
> On Mon, Jun 16, 2014 at 8:41 AM, Mastro Gippo <gipmad at gmail.com> wrote:
>> Hi all, I'd like to resurrect an old conversation. As we know, the
>> current PIC is quickly running out of resources and maybe it's time to
>> switch to a better platform. Two CAN buses are now desirable too. A microSD
>> slot and direct USB connectivity wouldn't hurt either.
>> I will probably have to design a similar hardware for myself, so I'd like
>> to contribute to the OVMS by sharing the HW platform if you want; no
>> strings attached of course, if you decide that there's no need for the
>> upgrade, I'll keep on working on my project by myself! :)
>> That said, I'd like to throw a few ideas to the table.
>> - MCU: I'd like to use an STM32 micro. They seem to be emerging as the
>> standard choice for diy ARM projects, and this offers a few interesting
>> opportunities:
>>  -Programming it in c/c++ with the manufacturer CMSIS standard libraries
>> (boring)
>>  -Programming it with the mbed.org SDK. Unfortunately no dev boards are
>> available with dual CAN bus, but it will be easy to move to the correct
>> micro of the same series once most of the software is ironed out on a dev
>> board like the https://mbed.org/platforms/ST-Nucleo-F302R8/
>>  -Programming it with an RTOS. NuttX would be my choice, as it's the one
>> used in the Ardupilot Pixhawk platform, and I'd like to learn it. This
>> would mean a steeper starting curve, but a lot of flexibility later as a
>> lot of stuff is handled on the OS level (network stacks, SD card &
>> filesystems, multitasking...). FreeRTOS is a nice option too.
>> I'd like to use the STM32F405RG as it's the most similar to the one found
>> on the Pixhawk, but of course I'm biased because of that, and that micro is
>> quite overkill for the task. We can of course use a lower specced part and
>> lose some RTOS fuctionality as long as it has 2 CAN buses.
>> - MODEM: I have no experience in this field; is the SIM908 still a good
>> choice or does anyone think that we should try new platforms?
>> I like this, but I don't know if the price puts it out of budget:
>> http://www.telit.com/telit/Pulsar/en_US.Store.display.1001./ge864-gps
>> On the bright side, it can be programmed in python, so we can offload
>> some of the work to the modem. This *could* allow us to free some space on
>> the PIC, and keep that platform without changing MCU..
>> - Enclosure: I think that, even with the new MCU, we can still fit the
>> old enclosure. Is that ok, or should we think about a more
>> automotive-friendly one? Maybe waterproof for the twizy?
>> And that's it. I think that the core SW developers should voice their
>> opinion, as there is a lot of work to be done on that front. A huge problem
>> will be keeping backwards compatibility to add features for the v2 users,
>> so we should discuss about this too.
>> Regards
>> MG
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