RE: Logging CAN messages

Hello John,

Just one remark. I was not suggesting that you (or your customer) would=20
make the change in the firmware. It would be an upgrade of the existing=20
software and done by myself.

Kees


John Dammeyer schreef op 31.10.2020 21:45:
> Hi Kees,
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> That product is close to what they need.  Nicely done!
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> Although when I had the scope on their system last Thursday it looks
> like the messages were running at least every 10mS.  I think they said
> 100Hz, 50Hz and 20Hz intervals.  I'd say I'd have to have the ability
> to store at least 5,000 messages at 500kbps.
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> A few years ago I did do a similar logging project.  They wanted the
> data stored on a Raspberry PiZeroW and then upload to the cloud via
> WiFi when available.
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> We found that no matter what we did the Pi still took about 12 seconds
> to boot.  Ultimately what I did was design and build a PIC32 front end
> to timestamp and queue all messages.  Once the Pi was awake the PIC32
> became an SPI slave to the Pi which then pulled up the stored
> messages.
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> Unfortunately I don't have access to the hardware or legally the
> software.  I was hoping that there might be something that uses a
> KVaser or Port or some other USB dongle and a PC application that
> would do this.
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> I'll talk to the client and mention your product.  Not that interested
> in making changes in Basic though.
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> Thanks again
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> John Dammeyer
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> FROM: [email protected]
> [mailto:[email protected]] ON BEHALF OF Kees Zagers
> SENT: October-31-20 11:53 AM
> TO: [email protected]
> SUBJECT: Re: [CANLIST] Logging CAN messages
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> Hi John,
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> In principle I created this functionality in my SI2CBB
> (www.unicanner.com [1]). The embedded hardware has all the CAN
> functionality in this case. The CANLOG command I created has the event
> logging possibility. Button (connected to one of the Arduino pins),
> specific message and error event can be defined by the user. The only
> restriction is the fact that I used the standard circular FIFO buffer
> of the built-in CAN controller of the Microchip PIC32. This buffer
> only contains 32 messages. So the pre-trigger information is 32
> messages, which probably will be a fraction of the messages during the
> last five seconds. The post-trigger information can be as long as you
> want. The PIC32 has the possibility to create 32 of these FIFO buffers
> in RAM, where every FIFO can be linked to one or more filters and
> masks. If all FIFO's are linked to the same filter and mask, they can
> be cascaded, which gives us a buffer of 1024 messages. The problem
> however in this case it is not circular; if the last FIFO is full it
> stops. I have to check, but it should be possible to detect the buffer
> full interrupt of the last FIFO and return to the first FIFO again. In
> that case we can have at least 1 second of the pre-trigger messages in
> a normal CANbus system.
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> Anyway it is difficult to say how large the circular buffer should be
> to contain the information of 5 or 10 seconds, because it depends of
> course on the bus speed and bus load.
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> The result of the logging can be directly uploaded to a PC through the
> USB interface or locally stored on an SD flash card.
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> So far my input.
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> Cheers
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> Kees
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> Op 30-10-2020 om 06:50 schreef John Dammeyer:
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>> I haven't kept up to date with newer developments over the last few
>> years. My Lawicel CANUSB, RM CANUSB and monitor program plus
>> whatever I've written has been adequate for the tasks I do.
>>=20
>> I've been asked to determine if a tool exists that can log CAN
>> messages in a circular buffer. Say 10 seconds worth and when a
>> trigger like either a message or say an error flag occurs the
>> logging to the circular buffer goes for 5 seconds and then is
>> stopped and saved.
>>=20
>> Essentially the system shows random faults and they'd like to know
>> what happened for 5 seconds on either side of the event.
>>=20
>> The even can be: a contact closure like a button pressed by an
>> operator; a specific message, Bus error as signaled by an error
>> flag.
>>=20
>> Does a tool like that exist?
>>=20
>> Thanks
>>=20
>> John Dammeyer
>>=20
>> "ELS! Nothing else works as well for your Lathe"
>>=20
>> Automation Artisans Inc.
>>=20
>> www dot autoartisans dot com
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> --
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> Kees Zagers
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> SI-KWADRAAT B.V.
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> Van Kemenadelaan 13
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> 5674 PP  NUENEN
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> Tel. +31(0)40-2839582
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> [email protected]
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> Links:
> ------
> [1] http://www.unicanner.com

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