Re: Logging CAN messages

Hi John,

Looks like a great product. The PIC32 is a nice controller for a CAN=20
front end system. Mainly the flexibility in the CAN controller makes it=20
very suitable.

BTW I also added the multiple FIFO buffers (1024 messages) to the=20
firmware, to use it as front end for an RPi. The prototype worked,=20
unfortunately the customer did not get the order for production. For the=20
interface to the Pi we used the I2C, which is better standardized than=20
the SPI in my opinion. For the new CAN FD and upcoming XL however I2C=20
will not be fast enough.

Kees


Op 1-11-2020 om 17:43 schreef John Dammeyer:
> Thanks Kees,
> I've passed on the information for your product to my client.  It looks l=
ike I'm also going to be able to get one of these.  I've put a photo on my =
web site since I don't remember if attachments work with this forum.
> http://www.autoartisans.com/CAN/STU-2.jpg
>
> It's got a PIC32 front end and connects via SPI to a PiZeroW and has GPS =
and RTC.  Starts logging c/w RTC based time stamps on power up and once the=
 Pi is alive and GPS TOD information is there it transfers the files onto t=
he Pi SD card.  Each file holds 4000 messages which include TOD, Lat/Long/A=
ltitude once per second.
>
> The only change to the PIC32 firmware will be info 'faked' CAN messages r=
eporting bus error conditions mixed in with the regular received CAN messag=
es.  But that too will cost the customer so when I meet with them next week=
 I'll know more.
>
> John Dammeyer
>
>
>
>> -----Original Message-----
>> From: [email protected] [mailto:canlist-owner@vector-i=
nformatik.com] On Behalf Of [email protected]
>> Sent: November-01-20 1:12 AM
>> To: [email protected]
>> Subject: RE: [CANLIST] Logging CAN messages
>>
>> Hello John,
>>
>> Just one remark. I was not suggesting that you (or your customer) would
>> make the change in the firmware. It would be an upgrade of the existing
>> software and done by myself.
>>
>> Kees
>>
>>
>> John Dammeyer schreef op 31.10.2020 21:45:
>>> Hi Kees,
>>>
>>> That product is close to what they need.  Nicely done!
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> I'll talk to the client and mention your product.  Not that interested
>>> in making changes in Basic though.
>>>
>>> Thanks again
>>>
>>> John Dammeyer
>>>
>>> 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
>>>
>>> Hi John,
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> The result of the logging can be directly uploaded to a PC through the
>>> USB interface or locally stored on an SD flash card.
>>>
>>> So far my input.
>>>
>>> Cheers
>>>
>>> Kees
>>>
>>> Op 30-10-2020 om 06:50 schreef John Dammeyer:
>>>
>>>> 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.
>>>>
>>>> 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.
>>>>
>>>> Essentially the system shows random faults and they'd like to know
>>>> what happened for 5 seconds on either side of the event.
>>>>
>>>> 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.
>>>>
>>>> Does a tool like that exist?
>>>>
>>>> Thanks
>>>>
>>>> John Dammeyer
>>>>
>>>> "ELS! Nothing else works as well for your Lathe"
>>>>
>>>> Automation Artisans Inc.
>>>>
>>>> www dot autoartisans dot com
>>> --
>>>
>>> Kees Zagers
>>>
>>> SI-KWADRAAT B.V.
>>>
>>> Van Kemenadelaan 13
>>>
>>> 5674 PP  NUENEN
>>>
>>> Tel. +31(0)40-2839582
>>>
>>> [email protected]
>>>
>>>
>>> Links:
>>> ------
>>> [1] http://www.unicanner.com
>> --
>> Archives and useful links: http://groups.yahoo.com/group/CANbus
>> Subscribe and unsubscribe at www.vector.com/canlist/
>> Report any problems to <[email protected]>
> --
> Archives and useful links: http://groups.yahoo.com/group/CANbus
> Subscribe and unsubscribe at www.vector.com/canlist/
> Report any problems to <[email protected]>

--
Archives and useful links: http://groups.yahoo.com/group/CANbus
Subscribe and unsubscribe at www.vector.com/canlist/
Report any problems to <[email protected]>