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5515的I2S为四线，它的数据线该怎么与三线的I2S设备数据线连接？
发送->接收接收<-发送
能详细点吗？三线的I2S只有一条数据线SD，5515的数据线有RX跟DX
你的三线的I2S器件是做接收还是发送用？
做发送的话，SD接c5515的RX
做接收的话，SD接c5515的TX
OK，谢谢大神指点
