单片机在通信中，浮点数的处理往往容易出错，本代码解决单片机通信时的浮点数据转换处理，包括浮点数转换成char ,和char转成float类型(The processing of floating point data is often prone to make mistakes in the communication of single chip microcomputer. This code solves the floating point data conversion processing of single-chip communication, including floating point number conversion to char, and char to float type.)