STM32检查体系时钟

调用库函数RCC_GetClocksFreq，该函数能够回来片上的各种时钟的频率

函数原形void RCC_GetClocksFreq(RCC_ClocksTypeDef* RCC_Clocks)

RCC_ClocksTypeDef界说于文件“stm32f10x_rcc.h”：

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);

履行完后，直接检查RCC_Clocks，在各成员中取出所需求时钟频率就行了。