如题目所说，为什么进入中断，标志位却不成立啊，中断设置是这样的  NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; 
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; 
 NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03;
 NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
 NVIC_Init(&NVIC_InitStructure); 然后在中断函数里判断标志位是这样的。 if(DMA_GetITStatus(DMA2_Stream0, DMA_FLAG_TCIF0)==SET) 总之进不去if，为什么啊，新手一枚，调试好久了，求大神指点。 上面是定时器中断，下面才是dma中断，然后还是那个问题 void MYDMA_Interrupt(void)
{
 NVIC_InitTypeDef NVIC_InitStructure;
 
 DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);//????DMA?????ê????????
 NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn ; //DMA2?????÷0????
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //??????????1
 NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03; //×???????3
 NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
 NVIC_Init(&NVIC_InitStructure);
}