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- 扫描4X4键盘,当有键按下被识别以后蜂鸣器鸣响一声,并 将键值在数码管和8个LED上显示,同时将键值通过串口发 送给PC机-When a keyboard, 4X4 scan button press is a buzzer rang after identification and Keys will be in digital tube and eight LED display, at the same time will be sent through a serial