Where I’m at:
- Successful initialization of the CAN module using the Opto-provided examples and subroutines
- Able to set the module in transmit mode (send a “k” to it successfully), and get status back (“S”)
- I have an up/active ECM on the other end of the bus (a Buick Regal engine, LHU, GM OBD2)
- My overall goal is to use the CAN module and the OBD2 connector to the ECM to replace the USB OBD2 interface we currently use with a PC and accompanying software (for reasons)
I am able to request all ~4 types of frames using the example subroutines and strategies, but I only get blank frames back with no true errors popping up.
I am in touch with support but there are currently no CAN experts on the team. I’m trying the general forum here as well
I do now understand that its up to me to implement a higher level protocol in order to make proper frame requests of the connected ECM and interpret the data that comes back correctly.
I am guessing I need to modify the EXACT module mask/filter/baud settings in order to get SOMEthing back from the ECM.
Can anyone point me in the correct direction? Again, I know I have some work to do, and am willing to pour some hours into the code, but could use some confirmation that I’m on the right path