Bitbang is set to drive input/output buffers like bus switch from read to write. Transfer sends the payload bistream. There are at least two bitbangs per swd transaction, there might be three, this is why it is so slow. The TAR autoincrement allows sending multiple data with one setup, this way we send data at maximum speed, but still there are two or three bitbangs per one data... it is not a problem on a GPIO but on USB each transfer is a 1ms delay... Best regards :-) Tomek
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