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TI专家、各位朋友:
大家好!最近在使用OMAPL138,我配置MCASP为主,AIC3104为从,16K采样率,I2S mode,32bit,不管是通过CPU还是EDMA都能实现直通。但我现在的需求是:16K采样率,2Slot,每Slot 16bit。在我改写的过程中,始终有些问题:
疑惑#1:对于I2S mode是不是只能配置成R/XFMT的RSSZ为32bit ?如果你最终只想得到16bit的数据,同过R/XMASK R/XPBID R/XPAD R/XROT等只取高16bit,其他低16bit屏蔽掉,这样理解对吗?
疑惑#2:假如“疑惑#1“理解是正确的,对每次EDMA的MCASP收发事件,一次该发送(接收)4个字节还是2个字节呢?