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List:       ms-smartcardddk
Subject:    Re: Vcomm_OpenComm failure in Millenium 2470
From:       Adam Ferman <AdamF () GOMAN ! CO ! IL>
Date:       2000-02-27 15:09:43
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In this case I'm a regular serial pnp driver reacting to a CONFIG_START
message. Is it normal for the device to be open by the PNP mechanism itself
while it's telling me to start the device ?

-----Original Message-----
From: Mats Hansson [mailto:mats.hansson@INTERTEX.SE]
Sent: Thursday, February 24, 2000 10:57 AM
To: SmartCardDDK@DISCUSS.MICROSOFT.COM
Subject: Re: Vcomm_OpenComm failure in Millenium 2470


I have experienced similar problems on Windows 95 and 98. We produce a card
reader integrated into a modem, so the COM Plug-and-Play opens the port for
a while and reads out the COM-PnP-string. Since this is done in a slow
speed, I think 1200 baud, plus time for the DTR and RTS signal fiddling,
there is a chance of collision with our card reader driver who wants to open
the same port at boot time. The timing of these things vary depending on
machine configurations, so the strategy I chose was simply, in the reader
driver, to try again a few seconds later if the first attempt failed (and a
3:rd time if the 2:nd time failed). This has worked fine.
Since Windows 2000 also do COM Plug-and-Play I suspect it is really the same
problem there, probably the timing is different.
Mats Hansson

At 18:06 2000-02-23 +0200, you wrote:
>I have a PCSC pnp driver that works fine on Windows 98 SE. When I test in
on
>the Millenium (build 2470) it fails if the device is connected at boot
>because the Com port is already opened. If I connect the device after boot
,
>it functions properly. I have eliminated the possibility that I opened the
>device and it appears as if the pnp system (Serenum.vxd) has the port open
>when it sends s the CONFIG_START message.
>Has anyone seen this behavior ? I saw messages referring to a similar
>problem in Windows 98.
>
>Adam Ferman
>Goman Ltd.
>

Mats Hansson
Intertex Data AB
Rissneleden 45
174 44 Sundbyberg
Sweden

Tel +46-8-6282828    Fax +46-8-6286414    www: http://www.intertex.se

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