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mcbsp配成IIS从设备后,工作一段时间后左右声道反了

我用的是C5509A,mcbsp需要与外面的IIS设备通信,并且将MCBSP配成IIS从设备,一开始都能正常工作,可工作一段时间后,从MCBSP中吐出来的数据左右声道就反了,请问有人遇到这个问题吗?