说明：  CAN控制器MCP2515的C程序源码，已测试有参考价值。代码写得很详细，有清晰的注释说明，全面解析了MCP2515的运行过程，很不错的学习材料。
(CAN controller MCP2515 C program source code, has been tested for reference. The code is written in detail, with a clear description of the annotation, a comprehensive analysis of the running process of MCP2515, a very good learning material.)