使用注意：1、应包含头文件slavr.h

2、在工程选项中的Additional Lib中填入slavr

　　　　 使用编译器使用附加库文件libslavr.a

3、本例采用了作按键释放检查的函数，适用于显

示电路不需频繁刷新的程序,如静态显示、LCD

模块电路等。-Use Note: 1, should include the header file slavr.h 2, in the project options in the Additional Lib fill slavr additional use of the compiler to use library files libslavr.a 3, in this case a check for the release of the function keys, the application of display circuit in the process do not need to refresh frequently, such as a static display, LCD module circuit.