[Ovmsdev] OVMS v3
William Petefish
william.petefish at gmail.com
Thu Oct 16 16:32:25 HKT 2014
It cleanly shutsdown. It also has a power button and a reset button.
It is using an entirely different processor. (Broadcom SOC for the
raspberry pi VS Allwinner A20 for the banana pi)
-W
On Thu, Oct 16, 2014 at 3:22 AM, Mark Webb-Johnson <mark at webb-johnson.net>
wrote:
>
> Seems to be very similar to raspberry pi - just faster cpu.
>
> Presumably suffers from same issues, though - power requirements and
> issues with unclean shutdown?
>
> Regards, Mark
>
> On 16 Oct, 2014, at 2:55 pm, William Petefish <william.petefish at gmail.com>
> wrote:
>
> Y'all might try the Banana Pi. I have 2. They run Linux and Android. Tons
> of GPIO.
> No Onboard WiFi. BUT that can be fixed with a $10 dongle. It only has one
> CAN though. BUT another can be added via an expansion board with the
> MicroOBD 200 module OR it can be made with a SPI-CAN uart from Microchip.
>
> -W
>
> On Wed, Oct 15, 2014 at 10:04 PM, Mark Webb-Johnson <mark at webb-johnson.net
> > wrote:
>
>> Kevin,
>>
>> An Arduino Due clone is about US$30, and a dual CAN bus shield about
>> US$25.
>>
>> But, that doesn't solve the Bluetooth, Wifi, GPS, GPRS, etc, issues.
>>
>> The problem we are seeing is that while the hardware seems trivial, it is
>> proving to be impossible to find. Refer back to the original list:
>>
>> • 32bit CPU with enough grunt, and a low-power sleep mode
>> • Dual CAN
>> • Async + I2C + SPI + GPIO expansion
>> • SD-Card
>> • USB
>> • Lots of RAM and FLASH
>> • Wifi
>> • Bluetooth
>> • Optional GSM
>> • Optional display (or can we get away with bluetooth to a cellphone?)
>>
>> That is what we need. Finding it in a low-power, low-cost, framework is
>> proving impossible. It seems that we are just too early, and I suspect than
>> in a couple of years this will actually be trivial. While GEVCU comes
>> close, the US$600++ pricetag is just too high. The EVTV kit doesn't even
>> come close but still costs eight times what we have now.
>>
>> Regards, Mark.
>>
>> On 16 Oct, 2014, at 2:08 am, Kevin Sharpe <
>> kevin.sharpe at zerocarbonworld.org> wrote:
>>
>> Just to be clear the EVTV CAN KIT retails at 149 USD and includes an
>> Arduino Due board, dual channel CAN bus shield, and DB-9 to J1962 Type A
>> ODBII cable;
>>
>> http://store.evtv.me/proddetail.php?prod=ArduinoDueCANBUS&cat=23
>>
>> This is by no means a OVMS replacement as it stands but it does give some
>> idea of how little the base hardware should cost especially when you
>> consider that EVTV does not strive to be the cheapest in the market by any
>> means.
>>
>> In an ideal world I would like to see a family of hardware products that
>> can scale up or down to meet the requirements of OVMS users (both power and
>> basic) as well as those using GEVCU, CAN-KIT, JLD505, and future products.
>> My motivation is to get developers using the same software platform and
>> libraries because this is where we need the effort… the hardware is trivial
>> in comparison.
>>
>> Kevin Sharpe | Founder & Chair of Trustees
>> Tel: +44 122 566 7544 ext: 800 | Skype: zerocarbonworld
>> kevin.sharpe at zerocarbonworld.org <kevin.sharpe at zerocarbonworld.org>|
>> www.zerocarbonworldorg <http://wwwzerocarbonworld.org/> |
>> twitter.com/zerocarbonworld <http://twitter.com/ZCWcharlie>
>> Zero Carbon World is a UK Registered Charity #1141347
>> From: Mark Webb-Johnson <mark at webb-johnson.net>
>> Reply-To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
>> Date: Wednesday, 1 October 2014 12:40
>> To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
>> Subject: Re: [Ovmsdev] OVMS v3
>>
>> Kevin, Colin,
>>
>> Last we discussed this, didn't we come to the conclusion that there
>> wasn't enough overlap between the two projects? Different goals, and most
>> importantly, requirements. I am also concerned about the US$600 cost of the
>> gevcu (without stuff like bluetooth, GSM and GPS which we need) - I don't
>> think people are going to pay that much for a telematics module.
>>
>> Or, have things changed?
>>
>> Regards, Mark
>>
>> On 1 Oct, 2014, at 7:07 pm, Kevin Sharpe <
>> kevin.sharpe at zerocarbonworld.org> wrote:
>>
>> It’s been interesting to watch the GEVCU development and the inevitable
>> move to a more robust hardware platform which will be based on the Cinch
>> Enclosure and connector (version 6). Something many people wanted at the
>> start of the project.
>>
>> IMO we need a robust hardware platform and the more we can focus software
>> developers on a single platform the better for us all… my vote is hardware
>> that’s compatible with GEVCU and the amazing libraries that exist today
>> (including Colin’s excellent CAN library).
>>
>>
>> Kevin Sharpe | Founder & Chair of Trustees
>> Tel: +44 122 566 7544 ext: 800 | Skype: zerocarbonworld
>> kevin.sharpe at zerocarbonworld.org <kevin.sharpe at zerocarbonworld.org>|
>> www.zerocarbonworld.org | twitter.com/zerocarbonworld
>> <http://twitter.com/ZCWcharlie>
>> Zero Carbon World is a UK Registered Charity #1141347
>> From: Collin Kidder <collink at kkmfg.com>
>> Reply-To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
>> Date: Tuesday, 30 September 2014 15:53
>> To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
>> Subject: Re: [Ovmsdev] OVMS v3
>>
>> I haven't really been involved with your OVMS project but I have
>> continued to follow it with interest. I really like what you're doing. With
>> the GEVCU project we went through much the same discussion you're having.
>> We obviously settled on using the Arduino Due (eventually rolling our own
>> board based on the Cortex M3 from the Due). The MBed has many similarities
>> to the Arduino Due hardware-wise but uses a totally different development
>> environment and library.
>>
>> Ultimately I think you are making the right choice. It's very tempting to
>> see something like the BeagleBone Black and want to go that route. But,
>> development of code for something like the BBB is much more complicated
>> unless you write it all in Python. LINUX is awesome on the desktop but I'm
>> not convinced that it is worth the trouble for small embedded projects.
>> Dealing with the complications that linux brings will just make the project
>> more complex and difficult to jump into.
>>
>> I know of other people using the MBED platform for vehicle use and it
>> seems to be going well for them. I don't see anything really wrong with
>> MBED and I think it will serve your uses very well. In my view going with
>> the MBED platform would serve you well and propel your project into the
>> future.
>>
>> -Collin Kidder
>>
>> On Tue, Sep 30, 2014 at 10:34 AM, Mark Webb-Johnson <
>> mark at webb-johnson.net> wrote:
>>
>>>
>>> And the winner is (or at least who I think the winner should be):
>>>
>>> *MBED (and probably Freescale **K64F variant)*
>>>
>>> <unknown.jpg>
>>>
>>> Firstly, hats off to Mastro for pointing this out last year. Back then,
>>> I didn’t think much of it - it had some good points, but I am very wary of
>>> cloud projects, and closed source cloud terrifies me. But, in the past
>>> year, the project has come so far, and actually using the hardware left me
>>> very impressed.
>>>
>>> I think our decision comes down to two choices:
>>>
>>>
>>> 1. A Linux base, probably compute-module style, with Megabytes of
>>> RAM, Gigabytes of Flash, incredible flexibility but a challenge to keep
>>> power consumption down
>>> 2. An embedded base, with hundreds of Kilobytes of RAM, Megabytes of
>>> Flash, and all the complexities that go along with embedded systems
>>>
>>>
>>> For me, the MBED architecture now offers a viable compromise between the
>>> two. The latest M4 processors give enough flash space (10 times what we
>>> have in our OVMS v2 hardware CPU), and RAM (64 times what we have in our
>>> OVMS v2 hardware CPU), that the limitation are lifted More importantly,
>>> drag-and-drop programming means that even if flash space became an issue,
>>> we could always just offer different firmware for different vehicles - but
>>> this time with re-flashing being simply plugging the module into the PC and
>>> drag-and-drop the new firmware file in place. Think of it as like having a
>>> PICKIT built onto the board, but with the programming software being the
>>> file manager of the operating system - the OVMS v3 module shows up as a
>>> drive on the desktop and you just drop the new firmware onto it.
>>>
>>> Let me explain, in a little more detail, how MBED works.
>>>
>>>
>>> - The MBED boards actually have two processors. The larger processor
>>> runs the end-user application (OVMS in our case), and the smaller processor
>>> makes up a system called the MBED HDK, based on the CMSIS-DAP standard.
>>> - The MBED HDK consists of a USB port (standard Micro-B type)
>>> connected to the MBED HDK CPU (on the board), some control circuitry, and
>>> an ICSP connection to the main CPU.
>>> - When you plug the MBED into the host O/S, it emulates a flash
>>> drive; dropping a file onto that drive programs the file onto the main CPU
>>> flash.
>>> - It also emulates a serial port to the host O/S so when you plug it
>>> in you get a serial port to the main CPU.
>>> - It provides a CMSIS-DAP standard debugger interface (for more
>>> advanced debugging).
>>> - The board itself can be powered from the USB, during MBED
>>> development or firmware updating.
>>> - As well as support for open source GCC toolchain (and others), the
>>> MBED included access to an on-line compiler - the code is kept in the
>>> cloud, in a shared revision control system, can be compiled there, and
>>> binaries downloaded for installation on the boards.
>>> - There are a large number of open source libraries available for
>>> the MBED platform.
>>> - Coding is in C / C++.
>>> - The MBED software includes a RTOS with thread support (which
>>> should make our job much easier than the current state-based and interrupt
>>> systems).
>>> - There are lots of low-power modes to work with.
>>>
>>>
>>> The MBED platform provides the lowest barrier-to-entry I’ve ever seen
>>> for embedded computing. No serial ports necessary. Just clone the project,
>>> tweak, compile, download (with no large IDEs required). Drag-and-drop
>>> firmware flashing.
>>>
>>> It is also still raw in places. For example, I purchased an NXP LPC4088
>>> MBED board to also experiment with (512KB flash, 96KB RAM, 32MB SDRAM, dual
>>> CAN) - only to find that the firmware on the HDK for that board doesn’t
>>> support OSX (despite the board being available for a year). That said, the
>>> freescale K64F seems pretty close to what we want, and has no such issues
>>>
>>> The other part of the puzzle is how we offer this. Some people want
>>> displays, other don’t. For 2G GSM one module was fine, but for 3G we need
>>> different modules for Asia, Europe and USA. Some want Bluetooth 2.1, others
>>> 4.0 BLE. Some want Wifi, others want cheap. Some want expansion. etc. What
>>> I’m thinking of is a baseboard design, with plug-in expansion modules.
>>>
>>>
>>> - The baseboard would contain the MBED HDK + main processor, power
>>> supplies, as well as connectors for vehicle, diag, expansion, and USB.
>>> - It would most likely be based off the K64F open source
>>> architecture.
>>> - We would have several (perhaps 4 or so) plug-in sockets on the
>>> baseboard, to allow expansion modules to be plugged in. Each of these
>>> sockets would have connections to the main processor as well as expansion
>>> ports.
>>> - The baseboard would give OVMS on 1x CAN port.
>>> - A 3G module would provide GSM + GPS (and would expose both
>>> antenna connectors to the outside world). The expansion board for this
>>> would be the same, but we would solder on different modules depending on
>>> the frequencies required.
>>> - A CAN expansion module would use Microchip MCP2515 controllers
>>> + MCP2551 transceivers (or something like it) to take SPI bus from the main
>>> CPU and expand CAN pins on the vehicle connector. Plug it in, and the
>>> system then has one or two more CAN ports available.
>>> - A wifi expansion module would provide WIFI connectivity.
>>> - A Bluetooth expansion module would use the HC-?? style
>>> bluetooth SPP modules. Similar to the 3G module, we can simply use the same
>>> expansion board - just solder on different bluetooth modules for v2.1 or
>>> v4.0 BLE
>>> - A generic expansion module could be used to add custom
>>> functions.
>>> - For the expansion modules, I’m think of two rows of connectors
>>> (one on each side) to provide connectivity and support. Very sturdy and
>>> cheap (something like this: https://www.sparkfun.com/products/10414).
>>>
>>>
>>> Anyway, those are my thoughts, and suggestions given what is available
>>> today. I started this v3 search looking for a Linux base, and really had my
>>> heart set on it. But I just can’t solve the power and complexity issues. To
>>> meet the goals of having something easy to pick up, MBED really seems the
>>> only viable option today.
>>>
>>> But, this is no longer my project. There are now so many people
>>> involved, and so many end-users. We are about to hit 1,000 users on the
>>> openvehiclescom <http://openvehicles.com/> website.
>>>
>>> So what do others think?
>>>
>>> Regards, Mark.
>>>
>>> On 17 Jun, 2014, at 9:06 am, Mark Webb-Johnson <mark at webb-johnson.net
>>> <mark at webb-johnsonnet>> wrote:
>>>
>>> Mastro,
>>>
>>> Actually, an opportune time as I've made some progress. I'll reply to
>>> your mail here, but take into account the follow-up discussions.
>>>
>>>
>>> - The requirements of the OVMS community are diverse. Some want
>>> pre-heating, some want relay control, some want a display, some want to
>>> reprogram their ECUs, some want GSM, and others want none of these. What we
>>> are trying to build is a framework that can be adapted by others.
>>>
>>> - I am stunned that nothing like this exists on the market. I've
>>> spent the past six months looking for a low-power, low-cost, module with
>>> wifi+bluetooth and a development environment. Linux/RTOS/whatever. But, I
>>> haven't found anything perfect. I understand Kevin's frustration - it seems
>>> that GEVCU and OVMS could base on the same hardware, but even with that
>>> there appear to be difference in requirement that would just drive up costs
>>> for OVMS (or drive down functionality for GEVCU).
>>>
>>> - On the GEVCU front, I tend to agree with Rickard's comment that
>>> the two systems complement each other, but are very different. OVMS could
>>> be a telematics module for GEVCU, and would add great functionality to that
>>> project.
>>>
>>> - I spent some time looking at a modular approach. Design a base
>>> board with CPU, power and CAN buses. Have that base board support plug-in
>>> modules for wifi, bluetooth, cellular, etc. In that way, we can use
>>> pre-certified modules, and the user buys what they need. But, the problem
>>> with this approach is that if what you need is bluetooth+wifi+cellular, the
>>> cost is driven up considerably.
>>>
>>> - Talking to the China factories, it turns out that bluetooth/wifi
>>> is cheap as hell and trivial to implement - so long as we are ARM based.
>>> They laugh when we mention Microchip. They are stunned when we say we don't
>>> run Linux.
>>>
>>> - A data plan just for the car is expensive (particular in some
>>> countries like USA), but if we can offer hotspot functionality then it can
>>> be shared with other devices in the car. For that, we would need to be
>>> Linux based.
>>>
>>> - On the power front, I don't really see the problem as being low
>>> power while running, but rather the ability to support a sleep mode when
>>> the car is off. We don't need low power always - we just need it for the
>>> 90% of the time the car is sitting idle, not charging, not driving. The CPU
>>> is not an issue here - they all support a deep sleep mode and we can reduce
>>> power requirement to quite literally a trickle. The problem is the comms.
>>> We need to be able to be remotely 'woken up' and keeping these
>>> GSM/Wifi/Bluetooth modules low power while supporting network stacks is
>>> just not possible. The established industry uses USSD messages to remotely
>>> wake up their systems, and now I understand why. A GSM module can be
>>> designed to be in deep sleep, with very little power usage, but still able
>>> to receive a USSD message.
>>>
>>> - GSM modules like the TELIT and SIMCOM are interesting in that they
>>> support running code inside the module itself. This is something we haven't
>>> taken advantage of, but offers us the opportunity of offloading a
>>> significant amount of what we do.
>>>
>>> - For me, the requirement comes down to a base framework and module
>>> that supports:
>>> - 32bit CPU with enough grunt, and a low-power sleep mode
>>> - Dual CAN
>>> - Async + I2C + SPI + GPIO expansion
>>> - SD-Card
>>> - USB
>>> - Lots of RAM and FLASH
>>> - Wifi
>>> - Bluetooth
>>> - Optional GSM
>>> - Optional display (or can we get away with bluetooth to a
>>> cellphone?)
>>>
>>> - What is interesting is the advent of low-cost Linux frameworks
>>> that are very close to what we need. Things like the BeagleBone and
>>> RasberryPi are fascinating, but really designed for HDMI video output - and
>>> the overhead of GPU + HDMI is a huge power drain. The closest I've found to
>>> what we require is (
>>> http://compulab.co.il/products/computer-on-modules/cm-t335/) -
>>> pretty amazing little device - low power, wifi+bluetooth, dual CAN, up to
>>> 512MB RAM and 1GB FLASH, for around US$50 (in horrendous quantities). I'm
>>> working with my contacts in China to see if we can base on a dev board
>>> something like that. If they can make Android phones for US$50, we should
>>> be able to get the guts of such a device for something similar. Then, add
>>> on GSM, take it from a BOM to a product, and we're probably looking at
>>> something still <US$150 but with so much more. The closest thing to ideal
>>> I've found at the moment is build a baseboard (connectors, power, CAN
>>> buses, etc) and have slots to take that CM-T335 module and an optional GSM
>>> module. But, I still think we can find something on the China market even
>>> closer to what we want/need.
>>>
>>>
>>> Anyway, those are my thoughts. My conclusion is that to me it seems
>>> sensible to work from a low-power linux base with built in dual-can, wifi +
>>> bluetooth
>>>
>>> Regards, Mark.
>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>>
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