Quote:
Originally Posted by 80stech
Have you checked the source code for comments and clues? I'm guessing this is on GitHub? have you posted questions there? As far as the hardware goes you are working blind without a scope or at least a logic analyzer. Have you tried to see if you can use the Pi as a logic analyzer bypassing the CAN bus shield/hat?
Have you tried disconnecting the terminating resistor as suggested? (My CAN bus module appears to have jumpered pull-ups.) Did you check into the grounding?
If your CAN module is fully isolated it will need both power and ground from the vehicle on the input side.
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So the project is on GitHub, and I’ve been communicating with the devs and other users on their slack for quite some time now. They’ve been helpful but nothing has made much progress. They believe the bus traffic may be encrypted.
I will look into the logic analyzer question in a little bit, but if it’s possible I will give it a try.
The pi is powered by the cigarette lighter outlet, so the ground and hot pins have direct continuity to the vehicle battery ground/power.
In response to the resistor question, I actually returned the original can module and switched it out for a 2 channel which also has a jumper for the termination resistor, which I have tried both on and off.
This is turning into one of those projects that I’m in way over my head and it’s starting to bother me that I can’t make progress. I guess the logic analyzer is the next best step.
Even the repair manual contains little to no info on the actual speeds/configuration of the can bus, besides telling me what it’s hooked up to on which pins.
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