(Resending since I forgot to cc the list)
There is at least one useful end-user use case for bitbanging. There
are many IO lines unused on the FTDI port that can be used for GPIO.
Some dongles expose these and of course a custom FTDI interface that you
integrate with your prototype can expose these.
If the generic
FTDI code does not expose this functionality, the alternative is to
modify the layout specific parts to support this. The downside is that
if you make a custom FTDI interface on your prototype you may need to
write your own layout driver.
Phil
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