1. First find the two files stm32f10x.h and system_stm32f10x.c;
2. Modification of system_stm32f10x.c
#if defined (STM32F10X_LD_VL) || (defined STM32F10X_MD_VL)
#define SYSCLK_FREQ_HSE HSE_Value
/*#define SYSCLK_FREQ_24MHz 24000000 */
#else
/* #define SYSCLK_FREQ_HSE HSE_Value */
/* #define SYSCLK_FREQ_24MHz 24000000 */
/* #define SYSCLK_FREQ_36MHz 36000000 */
/* #define SYSCLK_FREQ_48MHz 48000000 */
/* #define SYSCLK_FREQ_56MHz 56000000 */
//#define SYSCLK_FREQ_72MHz 72000000
#endif
3.stm32f10x.h modification
#if !defined HSE_VALUE
#ifdef STM32F10X_CL
#define HSE_VALUE ((uint32_t)8000000) /*!< 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 */
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