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说明：  CAN总线实验：按键控制：两块实验板分别下载好程序之后，利用CAN总线相连接。复位后，数码管各段全亮。按下S1--S4任意一个按键可以控制对方数码管的亮灭。(CAN Experiment one-key control: two experiment boards are connected by CAN bus after downloading the program.After reset, the digital tube all bright.Press S1--S4 to control the brightness and extinction of digital tube.)