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How the audio stream data is formatted to and from USBFS is not well documented but I am assuming it is still interleaved. So for example, each frame would be 6 bytes to I2S0, and then 6 bytes to I2S1.
Since the data has to go to different I2S FIFO registers I2S_RX_CHn_F0_PTR, it is unclear how to use DMA to accomplish it. Ideas?