[Ovmsdev] OVMS v3 - Microcontroller

Collin Kidder collink at kkmfg.com
Tue Feb 2 03:35:45 HKT 2016

Well, the first units shipped late last year to people who funded the
early kickstarter campaign. I've got one of those and I'm on the list
for 4 more when the first batch of general release units ship later
this month. The Electron seems pretty nice from what I've seen. I
haven't played with it much. One thing that kind of sucks with this
sort of cellular is that it nearly requires that you use their lithium
battery. You also need a really beefy power supply to keep it running.
I don't know what OVMS currently uses but you'd probably be looking at
a 10w power supply to ensure that all components stay running.
Electron seems to use their proprietary cloud network by default so
I'm not sure how well that would mesh with OVMS. But, it has a
cellular modem and it's open source so I don't see any reason it could
not be reprogrammed to use a custom cloud network.

On Mon, Feb 1, 2016 at 12:30 PM, Arthur Hebert <ahebert at gmail.com> wrote:
> The Particle Electron has recently caught my attention:
> https://www.particle.io/cellular. Actual performance and usability are
> unknown, since the first units don't ship until later this month, but it has
> some attractive features:
> low-cost M2M-oriented international SMS/data plans ($3/mo. for 20k messages)
> STM32F205 MCU with 1MB flash, 128k RAM and 2 CAN buses
> free development IDE: https://www.particle.io/dev
> also a free web-based dev environment at https://build.particle.io (I
> assume/hope this will support the Electron cellular board when it comes out)
> I know it doesn't come close to meeting the RAM requirements, but the
> cellular plan is a pretty big draw IMO. Perhaps worth using this module in
> conjunction with another board with a better MCU?
> -Arthur
> On Mon, Feb 1, 2016 at 5:35 AM, Mark Webb-Johnson <mark at webb-johnson.net>
> wrote:
>> Well, the new year is here and OVMS v3 is on the front burner now.
>> As you know, I’ve been waiting for the MBED system to settle down and the
>> news is … it hasn’t. Sure, they’ve finally released some open beta code, but
>> only really 1 board supported. No more online compiler. Complicated tools.
>> RTOS worse than the old MBED. And worse is a proprietary closed-source
>> server platform for their Internet-of-things MBED O/S. Luckily, the one
>> board they support is the NXP FRDM-K64F that I love. I’ve tried it, and it
>> sucks. Maybe in a year’s time…
>> I’ve been waiting and waiting for this. Can’t say how disappointed I am
>> with the whole direction of the MBED project and closed development, closed,
>> source approach.
>> Anyway, OVMS v2 is end of life. We can’t get the SIM908 GSM modules any
>> more. Even if we could, 2G really doesn’t have that much longer. There are a
>> lot of M2M devices out there, but the frequency space is just too valuable.
>> Over the next year or two, more and more 2G capable cell towers are going to
>> be turned off.
>> So, time to take the plunge and get on with it. I’m guessing an open
>> source development environment, some free RTOS, and an adapted boot loader
>> to allow us to flash from SC-CARD, USB, or something like that.
>> From an overall system architecture point of view, I think we know what we
>> want. A board with a fast micro controller, lots of ram and flash, several
>> CAN buses, and easy development environment, easy firmware upload for the
>> novice, SD card, USB, ethernet, wifi, bluetooth, and some digital I/O. Then,
>> expansion slots to plug in 3G/4G connectivity and whatever else we want.
>> We’ve now got lots of options on the wifi+bluetooth front. Within the next
>> couple of months, the ESP32 is going to be out, and that looks really nice.
>> Same story with 3G/4G modules. I don’t see this as an issue.
>> So let’s discuss the micro controller.
>> Let’s say we want at least 1MB flash, and at least 256KB RAM. At least.
>> Now, we need multiple CAN ports. 2 at a minimum, but 3 or 4 would be much
>> better. A lot of the newer cars split their stuff over multiple CAN buses,
>> and having that support would be great. Remember that we want one system
>> that can be used as a logger, development environment, and final production
>> system. That puts us in ‘automotive’ territory, which is not a bad place to
>> be.
>> ST have some brutal micro controllers, like the STM32F769. M7 core. Up to
>> 2MB flash, 512KB SRAM, and 3x CAN buses. All the older stuff is 2 CAN bus
>> max, but availability of the new 3xCAN bus stuff is summer 2016. A couple
>> supposedly available now, but I can’t find them.
>> NXP have a nice automotive range in the MPC micro controllers (in
>> particular MPC56 has lots of choice, and 10 year product life time), but a
>> strange e200z0 core that I’ve never seen/used. Again, brutal on the flash
>> and RAM, and up to 6 CAN buses. These are their SPC5 32bit automotive MCUs.
>> They have a ‘free’ GCC based development environment.
>> The NXP S32K looks good, but seems not available yet.
>> My preference is the NXP range, but I am concerned about that e200z0 core.
>> Really never heard of it. Anyone got any experience with this?
>> The ST stuff also looks good, but availability is tight.
>> Thoughts? Anybody have a good contact with NXP for some advice?
>> Regards, Mark.
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