HAL库里面仅给了下面6个：
/** @defgroup RCC_System_Clock_Type RCC System Clock Type
* @{
*/
#define RCC_CLOCKTYPE_SYSCLK ((uint32_t)0x00000001)
#define RCC_CLOCKTYPE_HCLK ((uint32_t)0x00000002)
#define RCC_CLOCKTYPE_D1PCLK1 ((uint32_t)0x00000004)
#define RCC_CLOCKTYPE_PCLK1 ((uint32_t)0x00000008)
#define RCC_CLOCKTYPE_PCLK2 ((uint32_t)0x00000010)
#define RCC_CLOCKTYPE_D3PCLK1 ((uint32_t)0x00000020) |
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