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说明：  实验二定时发送程序：复位后，发送板每个大约一秒时间利用CAN总线向接收板发送一个数据（值为发送板数码管显示值），按下按键1，可以暂停或启动发送。 发送板数码管显示值每隔大约一秒增加一（不管按键是否暂停向接收板发送数据）。接收板收到CAN总线接收的值显示在数码管上，初始为0。(Experiment 2 timing sending program: after reset, the sending board USES CAN bus to send a data (the value is the display value of the digital tube of the sending board) to the receiving board for about one second each. Press key 1 to pause or start sending.The display value of sending board digital tube increases by one every about one second (regardless of whether the button is paused to send data to the receiving board).The value received by the CAN bus by the receiving board is displayed on the nixie tube with the initial value of 0.)