For the operation of STM32F103 with CAN suffices external interface chip. But I want to use this chip as a USB-CAN adapter. Unfortunately, the chip does not support simultaneous operation of both interfaces.

Therefore, this board was designed. The board can be used in various configurations for slave modules.

The board can be used in conjunction with a classic breadboard:

And together with ProtoBoard-Uni ( https://hackaday.io/project/29527-protoboard-uni ):