On Tue, Sep 23, 2003 at 04:17:55PM -0500, Joel L. Breazeale wrote:
> Greg,
> 
> Thank you for your reply.  It's also reassuring to know a bug was actually
> found and *fixed*!  8-)
> 
> I have some news.  I tried a Belkin F5U109 and it worked, at least for the
> one device I was trying to get working.  I did not experience a dropped 
> character after 20 trials.  Here what I'm seeing in /var/log/messages for
> your information:

Nice, looks good.

> I have a follow-up I hope you can comment upon.  Now that it seems the first
> device works and doesn't drop characters, I have one other device that I'd
> like to see if I can get working (but it's not crucial) with the same adapter.
> I'm forced to use the adapter as the target laptop only has one serial port.
> The second device works fine with /dev/ttyS0.  Should the code that works with
> the serial port be able to work unchanged with /dev/ttyUSB0?  My guess is that
> it should.  The current code sets line speed (B19200) and mode (CS7 | CLOCAL |
> CREAD | PARENB), all that serial stuff you would expect; may I presume the com-
> bination of serial-to-USB adapter and driver should cause the adapter to be re-
> configured to use the correct serial settings?

Yes, it should all "just work".  Just point your program to
/dev/ttyUSB0.

> If all of this is true then it's curious that this just doesn't work.
> Perhaps I've found a problem.  I would be glad to pursue it if it
> would ultimately help to shore up a bug.  If you can give me any
> pointers on proceeding on debugging this situation I would be glad to
> try.  It might be useful to know the devide in question only trans-
> mits data.

What is not working?  Some usb-serial drivers do not handle all of the
different serial ioctls (don't know about this driver, as I didn't write
it.)  For example, the "setserial" program will not work on most
usb-serial drivers (the io_edgeport and io_ti drivers being the
exception).

thanks,

greg k-h


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