在stm32f10x.h文件中，修改HSE_VALUE值
#if !defined HSE_VALUE #ifdef STM32F10X_CL
#define HSE_VALUE ((uint32_t)25000000) /*!< Value of the External oscillator in Hz */
#else #define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
#endif /* STM32F10X_CL */#endif /* HSE_VALUE */