DFU 64kB write size#21
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The QSPI writes are fastest when everything aligns with the 64k boundaries. The FAT flash already writes in 64k chunks, but the DFU does not. I've added a buffer to defer the writes until either there is 64k to write, or the end of the file is reached.
I get a ~25% speed improvement with a ~3.5MB test file (41 seconds to 30) in the download portion of the flash procedure.