报错提示内容为：The float formatting support is not enabled, check your MCU Settings from “Project Properties > C/C++ Build > Settings > Tool Settings”, or add manually “-u _printf_float” in linker flags.
根据提示进入Tool Settings，把printf输出浮点数勾上
报错提示内容为：The float formatting support is not enabled, check your MCU Settings from “Project Properties > C/C++ Build > Settings > Tool Settings”, or add manually “-u _printf_float” in linker flags.
根据提示进入Tool Settings，把printf输出浮点数勾上
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