文件名称:main
介绍说明－－下载内容均来自于网络，请自行研究使用
用扫描方式读取四个独立式按键的键值，同时将
按键的键值在数码管上显示出来-By scanning way to read the key value of four independent type buttons, at the same time will be the keys of the buttons on the digital tube display.
按键的键值在数码管上显示出来-By scanning way to read the key value of four independent type buttons, at the same time will be the keys of the buttons on the digital tube display.
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main.c