Hello Andre Hartmann,
KL46 chip don't have the CAN module, so you can't use the KL46 directly with CAN bus.
If you want to use it, you need to use the external CAN module. You can use MCP2515 which you mentioned, I find it is the SPI interface, which can communicate with the MCU(KL46).
But we don't have the sample code for it, you need to finish it by yourself.
About the SPI driver, you can refer to our KSDK for FRDM-KL46, there have the SPI driver.
Welcome to MCUXpresso | MCUXpresso Config Tools
SDK builder, then choose FRDM-KL46, generate the code and download it.
Have a great day,
Kerry
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