系统上电后LED闪烁两次，然后读取AD0的值，发送给CAN总线 ,并显示在数码管低三位。 如果从CAN总线接收到数值，则显示在高三?-System power LED blinks twice, then read AD0 values ​ ​ sent to the CAN bus, and displayed on the digital low three. If the value received from the CAN bus is displayed i