cant set baud rate with stty

[tns1]

Peter Rehley wrote:
> 
> On Oct 8, 2005, at 4:33 PM, tns1 wrote:
> 
>> Cygwin on WinXP
> 
> What version of cygwin are you using?
> 
uname says CYGWIN_NT-5.1
cygcheck -c says 'no setup information found'
This is probably because this is a custom version of cygwin bundled with 
some cross-development tools (altera nios2). It does not live in \cygwin 
, and there are no packages, just binaries. I have already read on the 
cross-development forum that this custom version will not co-exist 
alongside a normal cygwin install, and I am wary of trying to update 
pieces of it since I wont be able to use the cygwin setup util to do so.

>>
>> I am trying to redirect the IO from a terminal app to a serial port.
>> $terminal_app > /dev/com5
>> Works but uses the wrong baud rate.
>>
I am really after '$terminal_app<>/dev/com5' but this only redirects the 
input. Maybe this is just not possible in the shell.

>> $stty /dev/com5 115200
>> Does not change the baud: 'unable to perform all requested  operations'.
>> I have tried many variations on this syntax.
>> $stty does not even show the usb adaptor I am using on com5, but it  
>> does not let me change the baud rate on the ports that it does see.
>>
> Did you try looking for this problem.....
> http://cygwin.com/ml/cygwin/2005-08/msg00485.html

That post sounds like a different problem, but I did see a post talking 
about problems setting the baud.
> 
> Try a snapshot.  You might be surprised.
> 
I installed the latest version of cygwin & coreutils (5.90-1) on a 
different machine - it gives the same result, 'unable to perform all 
requested operations'.
I noticed that setup did not automatically choose the very lastest 
versions - maybe the mirror was not up-to-date on all dependancies?. 
Anyway, I had to manually select the 5.90-1 over the 5.2.1-5

At this point I am just trying to verify that what I am trying to do 
should work. Does '$stty /dev/com1 19200' change the baud for anyone in 
a shell or a script, or am I chasing my tail? If it works, what version 
does it work for?

>> Should stty  let me change the baud in the shell?
>>
>> Where is the default baud rate I am getting established, in  windows, 
>> in cygwin, or in my usb adaptor driver?
>>
>> thanks
>>


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