@MarkT Thank you very much for your response. Yes, I have followed the tutorial. This tutorial actually reads stereo data and discards one channel data. It uses a if condition in the loop() which discards the zero values. The way it works is that the real channel provides non-zero value and the other channel provides zero which is discarded here. I just want to read the valid channel.
I can not use the if condition because I am using DMA instead of the processor itself.
Can you please help me with it? I would highly appreciate it.