What would it take to make CAN work with this? https://en.wikipedia.org/wiki/CAN_bus
It is supported in hardware for multiple protocols: CAN1.0, CAN2.0, and CANFD. I'm pretty sure there are 3 ports that can be used simultaneously and independently. I only use 2 with CAN1.0. Edit: By hardware support I mean that a CAN transciever connects to two GPIO pins with access to CAN chip hardware. No SPI interface needed.
Do you need a CAN controller and a CAN transceiver or just a transceiver?