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List:       rxtx
Subject:    Re: [Rxtx] Port-Enumeration fails
From:       Moritz Gmelin <moritz.gmelin () gmx ! de>
Date:       2004-07-13 11:37:45
Message-ID: 0EE458A2-D4C1-11D8-AF54-000A95BC7E8A () gmx ! de
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That sounds reasonable,

it matches the other problem that I had mentioned before, where the 
writeArray does not return....

M.

Am 12.07.2004 um 23:56 schrieb Trent Jarvi:

> On Mon, 12 Jul 2004, Moritz Gmelin wrote:
>
>> Hi,
>>
>> I have a problem on Windows, with
>> CommPortIdentifier.getPortIdentifiers();
>>
>> As soon as I approach a generic IrDA device to my USB-IrDA Dongle
>> (configured to be COM4) the call to getPortIdentifiers does not return
>> anymore.
>> It just hangs and cannot event be killed. If I disconnect the dongle 
>> or
>> turn the IrDA-Device off, it will return after a while.
>> It does not happen with all IrDA devices (with my Palm, I don't have
>> that problem).
>> Also, it does only happen in Windows.
>>
>> ??????
>>
>>
>
> It sounds like w32, IrDA reads and writes are not timing out.  This
> probably has something to do with the nature of the connections and the
> driver underneath.  With rxtx, enumerating the ports involves opening 
> the
> port and trying a timed out read.  It sounds like this is not timing 
> out
> in the situation you describe.
>
> I dont have a generic solution for this off had.  It is possible to 
> just
> have the testRead() code in SerialImp.c try to open and close the port 
> but
> not read.  It is possible to use specified ports.  I suspect that this 
> is
> going to have more problems than enumeration.  Someone with the 
> hardware
> is going to need to examine the issue in more detail.
>
> I'm really curious why that read does not timeout though.  It would be
> interesting to look at the w32 api structure with and without the IrDA
> setup you mention.
>
> -- 
> Trent Jarvi
> taj@www.linux.org.uk
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> Rxtx mailing list
> Rxtx@linuxgrrls.org
> http://mailman.linuxgrrls.org:8080/mailman/listinfo/rxtx
>

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