As embedded systems grow in complexity and demand faster, more reliable communication, developers turn increasingly toward advanced protocols like CAN FD (Controller Area Network with Flexible Data-rate). While classical CAN has served the automotive and industrial sectors reliably for decades, the rise of sensor-rich applications and real-time control systems calls for a modern alternative. STMicroelectronics’ STM32G431 NUCLEO board, paired with a CAN FD shield, provides a low-cost and scalable development platform for engineers working on next-generation embedded communication.

Overview: The Power of Combining STM32G431 and CAN FD

The CAN FD Shield for the STM32G431 NUCLEO-G431RB board offers a simple yet powerful solution for adding high-speed, high-throughput communication to embedded projects. Designed specifically to work with the NUCLEO-G431RB board, this shield takes full advantage of the STM32G431RBT6’s built-in CAN FD controller and pairs it with the robust MCP2562FD CAN FD transceiver.

Together, the NUCLEO board and the CAN FD shield create a compact development setup that supports reliable, real-time communication for automotive, industrial, and robotics applications.

CAN FD Shield Features and Benefits

The CAN FD Shield is designed with ease-of-use and performance in mind. It follows the Arduino Uno form factor, allowing it to plug directly into the NUCLEO-G431RB board. The shield includes a Microchip MCP2562FD transceiver, which supports high-speed CAN FD communication up to 8 Mbps in the data phase while maintaining compatibility with classic CAN.

The board provides an onboard 120-ohm termination resistor, making it suitable for use at one end of a CAN bus without the need for external wiring. Additionally, a power input jack allows the shield to provide power to the CAN bus, which can be especially helpful in systems where the Nucleo board is powered independently via USB.

For developers getting started, the shield comes with a sample STM32CubeIDE project that demonstrates basic CAN FD communication. This example helps engineers shorten development time by offering a working code base from which they can expand their applications. More information...

The NUCLEO-G431RB Board and STM32G431RBT6 Microcontroller

At the heart of the setup is the STM32G431 NUCLEO board, built around the STM32G431RBT6 microcontroller. This 32-bit ARM Cortex-M4 processor runs at 170 MHz and includes an integrated floating-point unit (FPU) and digital signal processing (DSP) instructions. These capabilities make the STM32G431 an ideal choice for control-intensive applications such as motor drives, digital power conversion, and high-precision sensing.

The STM32G431RBT6 offers 128 KB of flash memory and 32 KB of SRAM, balancing performance with memory resources suited for complex real-time firmware. Notably, it includes an integrated CAN FD controller, enabling high-speed data communication with low CPU overhead. This built-in peripheral removes the need for an external CAN controller, which reduces cost, complexity, and board space.

Beyond its CAN capabilities, the STM32G431 supports a rich set of peripherals. These include high-speed 12-bit ADCs with advanced analog features, such as oversampling and hardware calibration; a 12-bit DAC for analog output; comparators; and a wide array of timers, including motor control timers with dead-time insertion and fault management. This combination of analog and digital peripherals makes it an exceptional platform for precision control systems.

Another key feature of the NUCLEO-G431RB board is the inclusion of an onboard ST-LINK/V2-1 programmer/debugger. This component enables developers to program and debug their firmware without requiring any additional hardware. The board can be powered via USB or through an external power supply, offering flexibility for different development and deployment scenarios.

Application Areas and Use Cases

The pairing of the CAN FD Shield and the NUCLEO-G431RB is well-suited for a broad range of applications that require fast, deterministic communication:

• Automotive Prototyping: Use this platform to test electronic control unit (ECU) firmware, develop diagnostic tools, or simulate vehicle sensors and actuators over a CAN FD network.

• Industrial Automation: CAN FD is increasingly used in modern industrial environments, especially for real-time process control. This setup can serve as a prototyping platform for industrial controllers, programmable logic controllers (PLCs), or sensor nodes.

• Robotics: Robots rely heavily on inter-processor communication for sensor fusion, actuator control, and safety mechanisms. CAN FD’s enhanced throughput makes it ideal for such bandwidth-intensive systems.

• Research and Education: For academic settings and research labs, this combination offers a cost-effective way to experiment with advanced embedded systems and communication protocols.

Development Workflow with STM32CubeIDE

STMicroelectronics provides the STM32CubeIDE, a free integrated development environment based on Eclipse. Developers can easily configure the STM32G431 peripherals using STM32CubeMX graphical tools and auto-generate initialization code. The included CAN FD example with the shield demonstrates how to set up message filters, configure bit timing, and send or receive data frames using the HAL (Hardware Abstraction Layer) libraries.

This streamlined workflow significantly lowers the barrier to entry for embedded developers new to CAN FD or the STM32 platform. It also supports advanced users looking to migrate existing applications to higher-performance communication protocols.

Summary: Compact, Capable, and Ready for the Future

The CAN FD Shield for STM32G431 NUCLEO-G431RB is a compact and powerful platform that brings modern communication capabilities to embedded projects. With support for high-speed CAN FD, easy integration through the Arduino-compatible form factor, and the processing strength of the STM32G431RBT6, this setup empowers developers to prototype and deploy solutions that are ready for the evolving demands of industrial and automotive networks.

Whether you're building a proof-of-concept, developing a production system, or teaching the next generation of embedded engineers, this product combination offers a smart, scalable, and future-ready solution.

Nucleo Boards Programming with the STM32CubeIDE: Hands-on in more than 50 projects

The STM32 Nucleo family, developed by STMicroelectronics, consists of low-cost ARM microcontroller development boards designed for a wide range of embedded applications. This book focuses on developing practical projects using the STM32CubeIDE software, with a primary emphasis on the Nucleo-L476RG development board.

The initial chapters provide a concise overview of the Nucleo architecture, setting the foundation for the hands-on projects that follow. Each project explores key features of the Nucleo-L476RG board, including full software listings and detailed explanations tailored for STM32CubeIDE.

Projects range from basic applications such as blinking LEDs to more advanced implementations that involve peripherals and libraries like GPIO, ADC, DAC, I²C, SPI, LCD, DMA, analog input, power management, and the X-CUBE-MEMS1 sensor library. Topics such as debugging and code optimization are also addressed.

Additionally, several projects incorporate Nucleo Expansion Boards, which attach directly to the Nucleo board and extend its capabilities with components like sensors, relays, accelerometers, gyroscopes, and Wi-Fi modules. When combined with the X-CUBE-MEMS1 library, these expansion boards significantly simplify development and integration. More information...