void  RCC_GetClocksFreq(RCC_ClocksTypeDef*  RCC_Clocks)

typedef struct

{

  uint32_t SYSCLK_Frequency; /*!<  SYSCLK clock frequency expressed in Hz */

  uint32_t HCLK_Frequency;   /*!<  HCLK clock frequency expressed in Hz   */

  uint32_t PCLK1_Frequency;  /*!<  PCLK1 clock frequency expressed in Hz  */

  uint32_t PCLK2_Frequency;  /*!<  PCLK2 clock frequency expressed in Hz  */

}RCC_ClocksTypeDef;

例：

/* Get the frequencies of different on chip clocks  */

RCC_ClocksTypeDef  RCC_Clocks;

RCC_GetClocksFreq(&RCC_Clocks);