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C6455 EDMA3 Ping-Pong模式传输



请问一下,我用EDMA  Ping-Pong模式从McBSP接收数据,将接收目的地址一开始设置为Ping,Ping能接收数据,但是Pong桶里边收不到数据;就是说Ping接收完成跳不到pong接收数据。反过来,将一开始接收目的地址设置为Pong时,Pong可以接收一组数据然后跳到Ping接收,之后一直是Ping接收数据,不再跳到pong接收,这是什么原因?请教一下,感谢!