相关原文：
https://blog.csdn.net/wwt18811707971/article/details/80641432
http://www.52rd.com/Blog/Detail_RD.Blog_wangsw_26166.html
https://www.cnblogs.com/andyfly/p/11014799.html
直接调试
https://www.cnblogs.com/andyfly/p/11016375.html
https://wenku.baidu.com/view/da4ff72f011ca300a6c390c0.html
50欧匹配
https://www.cnblogs.com/andyfly/p/11014799.html
取值计算：
https://blog.csdn.net/a136498491/article/details/78176618
http://rf.eefocus.com/module/forum/thread-591377-1-1.html