说明：  树莓派SPI转CAN，利用MCP2515模块，进行CAN通讯，分开两个.py代码：TX（发送）和RX（接收）的，具体的GPIO口要在代码里自行修改为实际的PI通讯引脚。
(Raspberry Pi SPI to CAN, using MCP2515 module, for CAN communication, separate two .py codes: TX (send) and RX (receive), the specific GPIO port should be modified in the code to the actual PI communication pin.)