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keypad
- 4*4点阵键盘的实现。用运反转扫描法来实现对键盘的扫描,确定是那个按键接通,并通过串口输出,显示在显示器上。-4* 4 matrix keyboard implementation. Scanning method used to achieve the reverse operation to the keyboard scan to determine that the button is switched on, and through the serial output, display