VCP = Virtual COM Port driver
D2XX drivers allow direct access to the USB device through a DLL.
(No, they don't seem to explain what a "DLL" is.)
The good news is that there are drivers for FreeBSD, OpenBSD, QNC,
Linux
and OS-X (depending on exactly which OS release you are running and
exactly
which device). Haven't found anything on drivers for NetBSD,
Solaris, or Plan 9.
I don't see a transfer rate listed for the various OSes. (1 MB/s
vs 300 KB/s)
That is probably some of the best OS support that we can easily find.
Since it appears that VCP or D2XX are just software, we can use the
same layout for both. If the OS supports D2XX, we should use that;
otherwise, a virtual COM port works.
There is also a so-called "USB to UART Switch" manufactured by
Dallas/
Maxim Semiconductors
that can switch the two signals - this would be useful for having
both, but just USB would probably work.
switch the two signals? You lost me there.
Yeah, I should have just linked to the chip:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4333
I meant multiplex. I haven't really looked into this, but it
could be useful for older computers that don't have USB.
Now that I look at it, I think that you need to have separate
SIE and USB transceivers, so that won't work with the FTDI
chips. If we use the FIFO, it won't work anyway.
Hope that clears it up!
Nick
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