Hello NXP community,
I'm trying to add a second CAN channel to the S32K3X4EVB-T172. I opted to use CAN1, which is available on the J2(Pins 6,3 and Pins 15,21) and J4(Pins 4,2) headers. I have a FRDMDUALK3664EVB stacked on the S32K344EVB, but I still have access to the J4 pins through the K2 header on the FRDM board. I've checked the FRDM schematic and confirmed the pins are pass-through and not utilized. I also have an external isolated CAN transceiver. I first attempted to use the J4 header, and after almost a day of troubleshooting, I couldn't get it to work. I decided to switch to the J2 header (Pins 6,3), which is a little harder to access physically. With only pin changes in the S32 configuration tool, I had a functional CAN bus.
I initially suspected it might've been a pin configuration issue, but MSCR and IMCR for the PTA pins were x200001 and x2, which match the signal IO Mux table for CAN. MCR, CTRL1, and CBT registers did not reveal anything abnormal.
So my question is, what makes PTA11, 12 (J4 header) not work with CAN1, while PTB22,23 (J2 header) has no problems?
Hello Julián,
Thank you for pointing that out. I misread the schematic and assumed R353 was DNP. I can visually confirm R353 is populated on the board. I'll let you know what I find after removing that resistor.
Thanks,
Sandesh
Hi @sandesh,
Looking at T172 schematic, I can see that PTA11 is connected to ADC_POT0 in the board, which may interfere with the bus:
Do you have R353 populated? Can you try after removing it?
Best regards,
Julián