EPAS Electric Power Steering install

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DNasty777 said:
I haven’t read into MS that much but if you can set up custom frames that will send the right messages to the right ID for the epas you’re probably all good. Otherwise you’d need an “interpreter” in between. An arduino with a can shield that has two buses would work. You’d read the MS bus on one line and send the data repackaged on the other for the epas.
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Hay man! What's shakin? You kinda been missin for a minute.
 
DNasty777 said:
Hey Rusty, I’ve been lurking! Just busy with life outside of car stuff unfortunately. Still plugging away here and there on the valiant when I can.
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I understand. I forget sometimes other people actually have lives. lol
 
DNasty777 said:
I haven’t read into MS that much but if you can set up custom frames that will send the right messages to the right ID for the epas you’re probably all good. Otherwise you’d need an “interpreter” in between. An arduino with a can shield that has two buses would work. You’d read the MS bus on one line and send the data repackaged on the other for the epas.
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Yeah, I was thinking that second setup. Though I do wonder if you would strictly need a separate two lines or not. The MS can operate a couple of different ways, either in an 11 bit generic broadcast mode or their 29 bit proprietary setup. I think you'd still have to have an "repackager" either way as the MS CAN output is pretty limited in what you can change. The main thing I wonder is whether or not you could have two different protocols broadcasting on the same line or not. I can set up filters on all of my other CAN chips that would ignore stuff that wasn't addressed to that specific unit, but I'm not sure how the MS CAN controller is configured for that. For instance, my Arduino asks my Pi for the time to display on my dash gauge and the MS doesn't care, though I'm still using the MS format message packets for the sake of argument. I could always try changing them to a totally different setup just to see what happens I guess.

Ultimately I have a pretty limited number of controllers on the bus and I have complete control over 2 of the 3 of them, so I do wonder if I could make it work with just the single bus.
 
Map63Vette said:
Yeah, I was thinking that second setup. Though I do wonder if you would strictly need a separate two lines or not. The MS can operate a couple of different ways, either in an 11 bit generic broadcast mode or their 29 bit proprietary setup. I think you'd still have to have an "repackager" either way as the MS CAN output is pretty limited in what you can change. The main thing I wonder is whether or not you could have two different protocols broadcasting on the same line or not. I can set up filters on all of my other CAN chips that would ignore stuff that wasn't addressed to that specific unit, but I'm not sure how the MS CAN controller is configured for that. For instance, my Arduino asks my Pi for the time to display on my dash gauge and the MS doesn't care, though I'm still using the MS format message packets for the sake of argument. I could always try changing them to a totally different setup just to see what happens I guess.

Ultimately I have a pretty limited number of controllers on the bus and I have complete control over 2 of the 3 of them, so I do wonder if I could make it work with just the single bus.
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Yeah in theory it should work as long as none of the message IDs overlap. The only thing is we don’t really know all the message IDs the epas is looking for and sending out. I figured it would be more safe to separate the busses and only pass info that we know is good.
 
DNasty777 said:
Yeah in theory it should work as long as none of the message IDs overlap. The only thing is we don’t really know all the message IDs the epas is looking for and sending out. I figured it would be more safe to separate the busses and only pass info that we know is good.
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Agreed, definitely the safer way to do it.
 
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