Hi Folks,
Where is a good reference for creating a basic low-level driver for a
PCMICA card? Right now, we just want to issue read/write cycles to a
PCMICA card (i.e. for a memory-mapped I/O port such as lighting
LEDs/etc)
Thanks
Steve Spano
President, Finger Lakes Engineering
(V) 607-277-1614 x223
(F) 800-835-7164
(C) 607-342-1150
xxxxx@flconsult.com
www.fl-eng.com
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of L3sT4Rd
Sent: Saturday, January 28, 2006 6:52 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] q about driver allocated IRPs
Hi,
i’m writting a virtual serial port driver which redirects all incoming
IRPs to another
serial port (this is to make for example COM28 available to applications
which don’t
enumerate all serial ports but instead just provide 4 radio buttons to
select COM1-COM4
and is also the first driver i am writting…)
my driver is not directly layered onto some serial ports driver (because
i want a new serial port
to become reserved by the system) but opens a DeviceObject pointer to
the “underlaying” driver through a
IoGetDeviceObjectPointer call from within IRP_MJ_CREATE dispatch
routine.
now my problem is that all the IRP_MJ_xxx dispatch routines work fine
except from the IRP_MJ_READ routine.
my READ dispatch routine is getting called, marks the current IRP
pending, allocates a new IRP, sets a completion
routine and calls the “underlaying” driver. as some character is
received my completion routine is getting called,
frees the allocated IRP, completes the original IRP and returns
STATUS_MORE_PROCESSING_REQUIRED.
but hyperterminal simply doesnt display the received character, although
it recognizes the completed IRP and issues
a new read request.
so my first question is wheter or not i need to copy the buffer of the
driver-allocated IRP to original IRPs buffer ?
my second question is whether or not i need to adjust the IRP Stack Size
of my drivers DeviceObject in that case ?
and my third question (although unrelated to this topic) is if there’s
some way to change the com port number of my
driver that’s displayed by device manager (of course if i took care that
this port is not used otherwise, before…) ?
thx a lot.
regards, daniel.
Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
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