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DM365+AIC23B,playing works right,but record only sigle channel

shuai wu
Prodigy 45 points

I use McBSP to connect with AIC23b.  McBSP works on I2S mode.AIC23B works on MASTER mode.

linux driver is alsa.

It is all right when playing for example ,a stero music ,two speaker song .

but when record the 2 input line-in to file,then play it ,just one speaker song.

I set aic23b to work on LOOP-BACK mode,two channels of input can be played on two speaker.

I got the record file,like this image: