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McBSP+DMA只能进一次DMA中断

Other Parts Discussed in Thread: DM3730

如题,DM3730,开启DMA后只能进入一次接收中断,在中断里clear CSR和IRQSTATUS寄存器,请问有人知道为什么吗?是我配置有问题还是中断里需要进行什么操作?