Given the clear technical roadmap set forth by EU Delegated Regulation (EU) 2025/656 and the mandatory implementation deadline of 2027, developing next-generation smart EV charging stations that comply with the EN ISO 15118-20:2022 standard has become the only path for products to enter the European market. This means that traditional PWM communication methods will soon be phased out, with a comprehensive shift toward high-level communication based on GreenPHY power line carrier (PLC) technology, and the mandatory integration of Plug-and-Charge (PnC) and Vehicle-to-Grid (V2G) capabilities.
Hardware Foundation: High-Performance Core Board and GreenPHY Communication
Based on the MYC-YF13X core board, this solution integrates the Allion MSE102x GreenPHY PLC chip and offers two battle-tested hardware interface modes for flexible selection based on your product architecture:
RMII Interface Solution: Connects directly via the core board’s ETH1 controller to enable MAC-layer communication. We provide a comprehensive guide for modifying the device tree (myb-stm32mp135x-base.dtsi) and configuring pin multiplexing to ensure stable network connectivity.
SPI Interface Solution: Suitable for scenarios with limited layout space. We provide a complete reference covering everything from SPI device node configuration and interrupt pin definition to clock rate settings, enabling reliable operation even with flexible board layouts.
Core of the Protocol: ISO 15118-20 Protocol Stack and Fundamentals of Intelligent Functions
Building on the stable GreenPHY communication driver, a software protocol stack that meets the core requirements of the new regulations can be developed.
Plug-and-Charge (PnC) Readiness: The PnC functionality defined in ISO 15118-20 relies on TLS certificates and a Secure Element (SE). The MYC-YF13X platform features secure storage and a rich array of peripheral interfaces, enabling the seamless integration of hardware security modules compliant with the V2G root certificate system. This lays the hardware foundation for a fully automated process encompassing plug-in, authentication, billing, and charging.
V2G Development Support: The implementation of V2G functionality relies heavily on the real-time performance and reliability of underlying PLC communication. Based on the previously integrated GreenPHY driver, developers can focus on developing application-layer scheduling strategies—such as receiving and executing grid charging and discharging commands—without worrying about the stability of the underlying link. This clears the primary technical hurdles for implementing value-added services such as bidirectional energy flow and participation in grid frequency regulation.
Cloud Link: Quick Integration with a Lightweight OCPP Protocol Stack
Charging stations must be connected to a backend management system (CPMS). We have successfully ported MicroOcpp—a lightweight OCPP protocol stack optimized for embedded devices—to the MYC-YF13X platform.
Advantages of the protocol stack: MicroOcpp is written in C/C++, has extremely low resource consumption, supports modular compilation, and is highly suitable for running in embedded Linux environments such as the MP135. It fully supports OCPP 1.6 and is compatible with 2.0.1.
Practical Deployment
Server: We recommend using Docker to quickly deploy the open-source SteVe server for development and testing.
Client: We provide a comprehensive cross-compilation guide with clear, step-by-step instructions, from cloning the code repository (OcppMongoosedemo) to generating an executable file for the ARM architecture.
Communication Verification: We provide a comprehensive testing method that simulates charging gun status changes by manipulating GPIO pins, allowing you to observe status updates in real-time on the SteVe server interface. This helps you quickly verify whether the entire communication chain—from hardware status to cloud-based display—is functioning properly.
Summary of the Solution’s Advantages
Post time: Mar-25-2026
