STM32用DS18B20库函数，可在单总线上接多片DS18B20进行测温，修正了初次测温值为85度的bug。-STM32 library of DS18B20 functions, which supports the user to connect multi-chip on a One-Wire bus, fixxing the bug that the first temperature measurement result after power-on reset is 85 deg

此版本比较全面，修正了BUG，可以用于学习，也可以用于项目。若有不当之处，请自行修改。-This version is comprehensive, fixed a BUG that can be used for learning, and can also be used in projects.If there is wrong, please make your own modifications.