Subject: USB bulk read and Vista

NTFSD
1

Hi,

We’re having a WDF based USB function driver for a fingerprint scanner device. The driver works fine in 2k/2k3 and XP. But in case of Vista, we’re loosing the data when reading through the bulk read pipe.
We’re reading 1310720 bytes of the data at a time from our function driver. While this works fine in 2k/xp and 2k3, in case of vista, based upon our observation using hardware analyzer, it looks like some of the BULK IN packets are not read by the lower level driver(HCI driver?) from the device.
Due to this, some 512 byte chunks are missing and this causes the data read to be garbled.
Could this be a vista specific problem or any usage related problem? Any suggestions wiil be appreciated.

Thanks,
Arif

2

Sorry, I posted on the wrong group i guess.
----- Original Message -----
From: Arif Nasim
To: Windows File Systems Devs Interest List
Sent: Monday, September 24, 2007 4:16 PM
Subject: [ntfsd] Subject: USB bulk read and Vista

Hi,

We’re having a WDF based USB function driver for a fingerprint scanner device. The driver works fine in 2k/2k3 and XP. But in case of Vista, we’re loosing the data when reading through the bulk read pipe.
We’re reading 1310720 bytes of the data at a time from our function driver. While this works fine in 2k/xp and 2k3, in case of vista, based upon our observation using hardware analyzer, it looks like some of the BULK IN packets are not read by the lower level driver(HCI driver?) from the device.
Due to this, some 512 byte chunks are missing and this causes the data read to be garbled.
Could this be a vista specific problem or any usage related problem? Any suggestions wiil be appreciated.

Thanks,
Arif

NTFSD is sponsored by OSR

For our schedule debugging and file system seminars
(including our new fs mini-filter seminar) visit:
http://www.osr.com/seminars

You are currently subscribed to ntfsd as: unknown lmsubst tag argument: ‘’
To unsubscribe send a blank email to xxxxx@lists.osr.com