The STM32 family is a natural home for CANopen devices: broad availability, integrated CAN (bxCAN or FDCAN) peripherals, and enough headroom for the protocol plus your application. Bringing a CANopen stack up on an STM32 is straightforward when the stack is designed for portability.
What the hardware gives you
Most CANopen designs need one CAN channel; gateways and bridges use two. A part such as an STM32F207 — with multiple CAN controllers and an Ethernet MAC — is a common choice for a CAN-to-Ethernet gateway, letting a single device bridge CANopen to an IP network.
The porting layer
A well-architected stack talks to the hardware through a thin abstraction: send/receive a CAN frame, a millisecond timer, and (optionally) non-volatile storage for the object dictionary. Port those few functions to the STM32 HAL and the protocol logic runs unchanged. This is the essence of low hardware dependency — the same stack moves between MCUs without touching the certified core.
Object dictionary and integration
You describe your device through its object dictionary (CiA 301, plus any device profile). Good tooling generates the dictionary and the glue so you spend your time on the application — PDO mapping, SDO handling, NMT states — rather than protocol plumbing.
Building a CANopen node or gateway on STM32? Explore the ISIT-Neperis CANopen stack or request integration support.