今天细看了下，原来是0和4。专用于DMA1和DMA2的，而BDMA是用的另外的宏定义标志。
这里0和4是对应的DMA1或者DMA2的Stream0和Stream4的标志，同理1和5就是Srteam1和Stream5。
Stream0 到 Stream3的标志是通过LISR寄存器查看。
Stream4 到 Stream7的标志是通过HISR寄存器查看。
另外
#define DMA_FLAG_FEIF0_4 ((uint32_t)0x00800001U)
#define DMA_FLAG_DMEIF0_4 ((uint32_t)0x00800004U)
这个的8是什么鬼，看了参考手册，原来这个bit没有定义。
/** @defgroup DMA_flag_definitions DMA flag definitions
* @brief DMA flag definitions
* @{
*/
#define DMA_FLAG_FEIF0_4 ((uint32_t)0x00800001U)
#define DMA_FLAG_DMEIF0_4 ((uint32_t)0x00800004U)
#define DMA_FLAG_TEIF0_4 ((uint32_t)0x00000008U)
#define DMA_FLAG_HTIF0_4 ((uint32_t)0x00000010U)
#define DMA_FLAG_TCIF0_4 ((uint32_t)0x00000020U)
#define DMA_FLAG_FEIF1_5 ((uint32_t)0x00000040U)
#define DMA_FLAG_DMEIF1_5 ((uint32_t)0x00000100U)
#define DMA_FLAG_TEIF1_5 ((uint32_t)0x00000200U)
#define DMA_FLAG_HTIF1_5 ((uint32_t)0x00000400U)
#define DMA_FLAG_TCIF1_5 ((uint32_t)0x00000800U)
#define DMA_FLAG_FEIF2_6 ((uint32_t)0x00010000U)
#define DMA_FLAG_DMEIF2_6 ((uint32_t)0x00040000U)
#define DMA_FLAG_TEIF2_6 ((uint32_t)0x00080000U)
#define DMA_FLAG_HTIF2_6 ((uint32_t)0x00100000U)
#define DMA_FLAG_TCIF2_6 ((uint32_t)0x00200000U)
#define DMA_FLAG_FEIF3_7 ((uint32_t)0x00400000U)
#define DMA_FLAG_DMEIF3_7 ((uint32_t)0x01000000U)
#define DMA_FLAG_TEIF3_7 ((uint32_t)0x02000000U)
#define DMA_FLAG_HTIF3_7 ((uint32_t)0x04000000U)
#define DMA_FLAG_TCIF3_7 ((uint32_t)0x08000000U) |
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