[Ovmsdev] CAN BUS logging to flash storage

Michael Balzer dexter at expeedo.de
Thu Jan 11 20:59:50 HKT 2018


I'll add the logging support along with the TX queue.


Am 10.01.2018 um 01:27 schrieb Mark Webb-Johnson:
> Probably best to split this off as a separate eMail thread.
> I think the implementation would be relatively simple.
>   * Create a canlog class with a FILE* m_log member variable, and a virtual function Log() that is called with a direction (tx/rx) and frame
>     to log.
>       o The constructor should be passed the vfs file path to log to. It should fopen the m_log file to that.
>       o The destructor should fclose the m_log file.
>   * Create a canlog_crtd class, derived from canlog, that supports Log() to log to m_log in CRTD format.
>   * Optionally create other canlog_* classes, for other logging formats that we want to support.
>   * Add a canlog* m_log member variable in canbus.
>       o Initialise m_log to NULL in the constructor.
>       o In the destructor, if m_log is not null, delete it’s object and set it to NULL.
>       o Have a command ‘can log’ like ‘can trace’ that specifies a vfs file path (remember to check it with OvmsConfig ProtectedPath) and
>         logging format. It will then ’new’ a canlog_* style object (depending on logging format).
>   * In can::IncomingFrame, log incoming CAN messages with m_log->Log(), in the same way as m_trace is handled.
>   * In canbus::Write, log outgoing CAN messages with m_log->Log(), in the same way as m_trace is handled.
> Volunteer?
> Regards, Mark.
>> On 10 Jan 2018, at 8:07 AM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>> Now SD CARD support is coming, anybody want to step forward and extend components/can to support CAN bus logging to a file (in crtd format,
>> or perhaps support one or two popular formats)? Implementation would be in class canbus, very similar to m_trace; just need to have a FILE*
>> m_log and appropriate commands / logging of packet write/read in the same place that trace does it.
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Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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