实验1数码管与键盘实验

代码说明：

  串口输出：LED_KEP test!； 程序运行后8LED会数字滚动，LED跑马，然后按键盘8LED会显示不同的键值； 屏幕上显示相关的文字。(Serial port output: LED_KEP test!; After the program runs, the 8LED will scroll digitally, the LED will run horse, and then the keypad 8LED will display different keys. The relevant text is displayed on the screen.)