RCC_ClocksPara my_clock;
uint32_t my_CK_SYS_Frequency //The frequency of the CK_SYS
uint32_t my_AHB_Frequency //The frequency of the AHB
uint32_t my_APB1_Frequency //The frequency of the APB1
uint32_t my_APB2_Frequency //The frequency of the APB2
uint32_t my_ADCCLK_Frequency //The frequency of the ADCCLK
RCC_GetClocksFreq(&my_clock);
my_CK_SYS_Frequency = my_clock.CK_SYS_Frequency;
my_AHB_Frequency = my_clock.AHB_Frequency;
my_APB1_Frequency = my_clock.APB1_Frequency;
my_APB2_Frequency = my_clock.APB2_Frequency;
my_ADCCLK_Frequency = my_clock.ADCCLK_Frequency;
变量定义一定要定在main函数外面，否则监视器看不了
