读者使用源代码时，将源代码拷贝到您的计算机相应目录之后，需要取消所有文件的只读属性，否则您可能无法正常使用这些源程序(单片机模块学习)-readers to use the source code, copy of the source code to your computer corresponding directory, the need to remove all the read-only attribute, otherwise you may not be able to use the normal source (SCM module learning)