说明：  STM32F407时钟，中断配置头文件，该文件包含HSE,HSI,LSE,LSI,I2S,MCO时钟的初始化； PLL时钟配置，PLL,SYSCLK，HCLK,PCLK1，PCLK2时钟的配置； RCC,GPIO,EXIT,NVIC的配置；
(STM32F407 clock, interrupt configuration header file that contains the HSE, HSI, LSE, LSI, I2S, MCO clock initialization PLL clock configuration, PLL, SYSCLK, HCLK, PCLK1, PCLK2 clock configuration RCC, GPIO, EXIT, NVIC configuration )