[Ovmsdev] CAN bus logging not working

Mark Webb-Johnson mark at webb-johnson.net
Tue Feb 7 08:06:47 HKT 2023

First guess is that you have to ‘can log stop’ to close the logging file before you will be able to see the content.

If that is not it, please provide details of the logging commands you are typing, and what ‘vfs ls /sd’, ‘can can1 status’, ‘can can2 status’, show.

Regards, Mark.

P.S. If you have a modern OVMS module, I also suggest you double-check the sdcard maxfreq.khz setting to optimise performance:


> On 7 Feb 2023, at 4:08 AM, Christos Oscar Kambiselis <ckambiselis at gmail.com> wrote:
> Hi,
> Has anyone had any problems with CAN bus logging? 
> I have a 32GB SD card installed and "SD status" gives:
> SD CARD is inserted
> Status: available
> Name: SD32G
> Size:  30419 MB
> Free:  29767 MB
> Card type: SDHC/SDXC
> Max speed: 25000 kHz
> Capacity: 30436 MB
> CSD: ver=1; sector_size=512; capacity=62333952 read_bl_len=9
> SCR: sd_spec=2; bus_width=5
> I have setup CAN1 and 2 to "listen" and started the logging like it's mentioned in the user guide, checked the status, I stopped it some time later, and when I go to open it from the Web UI it is empty, also tried from the Editor and it is also empty, removing the card is a bit tricky since the hardware is pretty tucked away in the console. I searched the manual for a format command but can't find anything.
> I do get messages and readings on the OVMS Android app, so at least the OBD CAN is fine.
> Oscar
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