..\CMSIS\core_cm4.h(112): warning:  #1215-D: #warning directive: "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
        #warning "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"

解决方法:添加  __FPU_PRESENT,__FPU_USED

 

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