Hi,
> I ported my test program to D2XX and it behaves identically, so it doesn't
> seem to be a bug in libftdi.
It seems I had done the port from an old version with a bug - when using d2xx
the factor is always about 0.25 - for sync and async bitbang. This most
probably comes from d2xx reading it's data in a background thread instead of
synchronous in one thread.
So I have created a version of baud_test with substantially reduced usb read
timeout and this yields the same results.
So one question remains: why is bitbang always only using 1/4 of the expected
baudrate?
Kind regards,
Gerd
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