DSP5 CAN Messages.

[Chavez91]

Hey Ross.

For some reason I remember seeing something long ago in the documentation about the CAN message structure needed to change tunes via the OBD-II. (Were talking a LLY specifically)

Correct me if im wrong.

I was just looking cause I was throwing something silly together with my little Arduino board to control my lift pump and various other sensors and thought It would be something nice to implement.

If so, can you show a link of where to find it at

Thanks!

Happy New Years!

[Mitco39]

IIRC the message was only during the flash process, not during the switching of the tunes.

[Chavez91]

Maybe I didn't word it correctly?

I'm just looking for what messages need to be sent in order to change DSP tunes. Like how the EDGE CTS does it.

[Road]

This is the link Ross sent me don't know if it is what your looking for.
https://service.gm.com/gmspo/mode6/index.html

[GMPX]

Maybe I didn't word it correctly?

I'm just looking for what messages need to be sent in order to change DSP tunes. Like how the EDGE CTS does it.

It is not done on the CAN bus, the older LB7 & LLY switching messages are done on GM's own VPW bus, totally different to CAN.

[Chavez91]

It is not done on the CAN bus, the older LB7 & LLY switching messages are done on GM's own VPW bus, totally different to CAN.

Is there documentation you can send me on it?

[GMPX]

Edge were never given official permission to do the switching BTW, they just did it.
Checkout how much of a pain the VPW bus is to interface to before you get too excited, the physical interface chips are drying up. I think we are currently buying them at 5,000+ lots off parts brokers.

[Chavez91]

Luckily I was planning on using a ELM327 v2.1 chip from ELM Electronics, so I have a few sitting here on the desk. Looking at the specs it should do just fine communicating on the VPW bus. Looks like it supports most all standard OBD-II protocols. They were a little pricey. I guess because they're hard to find (like you said) and that its kinda an obsolete protocol makes sense as to why.

[GMPX]

Luckily I was planning on using a ELM327 v2.1 chip from ELM Electronics, so I have a few sitting here on the desk. Looking at the specs it should do just fine communicating on the VPW bus. Looks like it supports most all standard OBD-II protocols. They were a little pricey. I guess because they're hard to find (like you said) and that its kinda an obsolete protocol makes sense as to why.

We don't use ELM chips in our hardware, the Infineon CPU we are currently using in V2/AC has a VPW processing module built in (which is one of the main reasons we picked it), the hard chips to get are the 8 pin IC's that connect the VPW bus to the CPU (I don't recall the actual Freescale part number of it).
Essentially when GM switched to CAN in 2006 all semiconductor manufacturers stopped making anything to do with VPW, here we are 10 years on and parts are really drying up now.

[Chavez91]

Oh I didn't think you used that chip specifically. Didn't seem like it would fit the application very well when i thought about after I got reading the specs. But yeah, I can see how that really bites you guys in the butt as time goes on. Im assuming as far as the V3 design is going, you have found a solution to the IC supply problem for VPW support?