27 Aug
2012
27 Aug
'12
7:31 p.m.
On Mon, 27 Aug 2012 08:30:59 -0700
Al Kossow <aek at bitsavers.org> wrote:
I was thinking on the drive in about the old smart
cables, It
would be interesting to take an AVR with USB interface and make
a serial dongle that would sense if the other end is driving
pin 2 or 3, then flip the direction of the signals appropriately.
It could also handle RTS/CTS or CTL-S/CTL-Q handshaking directly
and generate a serial break.
All you need for this is readily available.
Core USB stack, purly done in software:
http://www.obdev.at/products/vusb/index.html
RS-232C adapter using the USB-CDC protocol based on V-USB:
http://www.recursion.jp/avrcdc/
You can do it in a cheap low end AVR that is even considerably cheaper
then a FTDI chip.
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}