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TMS320C6748: uart & edma3的同时收发问题

Part Number: TMS320C6748

在官方提供的基于startware的uart demo中,串口发送后会将dma失能,下次发送时再将其使能,接收同理。但是二者共同使能/使能同一个dma,这样就造成了不能在准备接收数据时发送数据,我尝试了一下,会只能发送一次。

请问如何配置dma才能够同时进行dma收发?