CanOpenSTM32 is an STM32 integration layer and example suite for the CANopenNode CANopen protocol stack. The core code provides a compact C API in CANopenNode_STM32/ that wraps CANopenNode initialization and periodic processing into canopen_app_init(), canopen_app_process(), canopen_app_interrupt(), and canopen_app_resetCommunication(). The CANopenNodeSTM32 configuration struct carries bus handles, node ID, baudrate, and timer callbacks, allowing the same application pattern to run across multiple STM32 families. A low-level driver abstracts STM32 HAL classic CAN and FDCAN peripherals behind a unified interface, with optional locking hooks for bare-metal or FreeRTOS use. The repository is primarily a collection of board bring-up examples rather than a standalone product. It contains full CubeMX-style firmware projects for STM32F0, F3, F4, G0, and H7, both bare-metal and FreeRTOS variants, with vendored CMSIS/STM32 HAL drivers and generated CANopen object dictionaries. The dominant data flow is interrupt-driven: a 1 ms timer interrupt feeds canopen_app_interrupt(), CAN/FDCAN IRQ handlers push received frames into CANopenNode, and the main loop calls canopen_app_process() to run protocol state machines. Build automation is provided by per-example CMake presets and scripts/build.py, which builds every example project. A legacy/ tree contains older H7-specific FreeRTOS implementations and duplicated vendor drivers that are not actively maintained. There are no automated unit tests; verification is build-based and board-level.