The reference manual mentions that data swapping can be used when e.g. processing ASCII, but I'm not clear on exactly what it does. If I set it to byte mode, does that mean I can write single byte values padded to 32 bits with zeros into the FIFO? And with the bit mode, can I write single bits padded to 32 with zeros? What if I don't pad with zeros and just write 31 random bits plus the 1 bit I care about?
Obviously I can gather the bits together into a 32 bit word and write it in one go, but that will involve the CPU. If I can write bits, or even just bytes, with DMA, it will improve performance considerably.
