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iMX6solo audio channel swap

Question asked by Jongho Song on Nov 25, 2015

I am developing sound card driver.

 

Our system is as below.

In SSI. CPU is slave. Clock and Frame sync receive from codec chip.

Sound output sequence is ALSA -> ASRC -> SSI

And output sample-rate is 48kHz.

Our system must need ASRC.

And frame sync and CLK is output from codec chip continuously.

 

In test, sound channel is swapped sometimes. (50%)

How can this problem resolve?

 

Reference code and Document say. this problem is solved by using dual FIFO.

But, if system use ASRC, It can't be adapted .

 

Please, help me.

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