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.I actually have 32 channels @ 96kHz in and out as TDM slave working fine in the simulator. I used 4 x 4-bit port2 and I4S on each data line (bit clock is now 12.5Mhz instead of the more challenging 25 Mhz). I ended up having one task dedicated ot i/o and another task that does the zip/unzip and a small amount of processing. I use a shared memory block declared in .asm to support simple pingpong
Yes, often the way and when dealing with the last few cycles, it's nice to be sure exactly what instructions are being excuted. As long as one side writes and the other side reads (and you know when values change) then a piece of shared memory effectively gives you a multi-channel shallow lockless FIFO.I know in theory I could use movable pointers and swap operations, but it seemed simpler just to use a block of memory.