[Ovmsdev] SWCAN

Craig Leres leres at xse.com
Wed May 18 14:42:54 HKT 2022

On 5/17/22 17:55, Mark Webb-Johnson wrote:
> Regarding: 
> https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/704 
> <https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/704>
> Marko did some work on the back in 2019, and helpfully published under 
> MIT license here:
>     https://github.com/mjuhanne/OVMS-SWCAN
>     <https://github.com/mjuhanne/OVMS-SWCAN>
> Very grateful for that.
> Now, the Bolt EV people are asking for this.
> In general, it seems that we can do a simple board in the same way as 
> the K-Line was done. Use the two available GPIOs (one for INT and the 
> other CS). Then the GPIOs on the MCP2515 to control the transceiver 
> mode. Expose the single SWCAN pin on the DB9, in the same way as K-Line 
> does it. GND (for SWCAN-low) is already available there.
> Anybody see any problems with that approach?
> I am happy to arrange the hardware, given sufficient interest, but have 
> almost no way of testing (as none of the cars I have access to have SWCAN).

I would like to support this work and can test with my Cadillac. I also 
have a couple of the ovms protoboards and could probably build my own 
hardware to test with.


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