Hi,
I had a problem with a FT232R based device, the LinkUSB 1-wire dongle,
and my libftdi-based owfs (software package).
The issue was, after boot and/or device reconnect, I was not able to
communicate at all with my device, but once I had interacted with it
using the OS serial layer, it worked perfectly fine.
Upon researching the issue I found
http://developer.intra2net.com/mailarchive/html/libftdi/2012/msg00331.html,
which described the
exact same issue, but gave no solution.
In my case, I found the solution!
The FreeBSD (10.2) ucom/uftdi driver (provides /dev/cuaUx from FTDI
devices) will, upon first open(), set RTS and DTR to 1.
By adding ftdi_setdtr_rts(ctx, 1, 1) to my code, it now works fine even
if freshly booted and/or reconnected.
I did try setting SIO_RTS_CTS_HS instead, but that did not help at all..
Also, it seems it is enough to set RTS 1 and leave DTR 0.
So, three things:
a) Pelle Windestam (whom I cannot CC, since the email is hidden), I
found a solution! Maybe it works for you too :)
b) Anyone else with the same problem, try this!
c) Would it make sense for libftdi to set rts/dts defaults to 1, as both
Linux and FreeBSD seems to do this (when opening as a regular serial
port)? Although, devices may use RTS/DTR for any purpose, it might be
best to leave it alone..?
Anyway, this info might spare someone else trying to debug it!
Regards
Johan
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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