[Ovmsdev] SWCAN

Mark Webb-Johnson mark at webb-johnson.net
Mon May 23 15:39:05 HKT 2022

Discussing with the manufacturer, feedback is:

Given component vs board manufacturing cost, it seems simplest to combine this with the existing k-line option board, to produce a new ‘combo’ option board containing both K-line and SWCAN (DIP switch selectable one or the other, not both).

The TH8056 component is causing issues. Availability is poor (in China) and price is very high.

Does anyone know of any alternative to the TH8056 that can be suggested? Any other comments on this?

Regards, Mark.

> On 18 May 2022, at 8:55 AM, Mark Webb-Johnson <mark at webb-johnson.net> 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).
> Regards, Mark.
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> OvmsDev at lists.openvehicles.com
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