Re: assessing winusb potential

Sorry about multiple responses, I just thought of a better way to rephrase my
basci question.

Still confused about flow control on bulk transfers. Is it performed in
software, hardware or some sort of combination. Basically I want my device to
receive some data and process the data received so far, though there is still
more to come. While proccessing I obviously do no want to lose data.

"Maxim S. Shatskih" wrote:

If the device is not ready to accept the packet, it returns NAK, and the
host _hardware_ (the driver stack does not know on this) retries this packet on
next USB frame.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@xxxxxxxxxxxxxxxx
http://www.storagecraft.com

"pswork" <pswork@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:40C70210-AF65-4F0F-805D-F9479F0C7C95@xxxxxxxxxxxxxxxx
Thanks. A related question....

I am now pouring over a USB book but the issue is still not clear. When the
hosts sends data to a device, how does it know that the device has had a
chance to read the data from it's USB hardware. What prevents the host from
overwriting data if the device is slow to respond?

Paul


"Doron Holan [MSFT]" wrote:

the device can only put bits on the wire when the host asks for it. this
is
why the host driver must always pend a transfer on the IN endpoint if the
device is sending data asynchronously outside of the host asking for it
through a protocol (like writing a packet to the OUT endpoint). as for the
exact sequence of events in hw, i am a bit fuzzy, but any book on the usb
protocol will tell you.

d

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"pswork" <pswork@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:FE329BF1-867F-40C5-B4A6-337942AE1CDA@xxxxxxxxxxxxxxxx
Thanks. I am working with some example code from the micro-controller I
am
using. So it appears in the USB interrupt handler that there is an event
for
IN and OUT data. On OUT data it calls an endpoint handler that reads the
data
sent by the host. But what triggers the IN data event. Does it go like
this?

1. My device writes data to the IN endpoint.
2. USB hardware sends the data.
3. The IN data interrupt/event occurs after the data has been sent to the
host. My device can now write more data to the IN endpoint.

I'm still a little confused on when I can safely write to the data to the
IN
endpoint and what is the significance of the IN data interrupt.

Paul


"Doron Holan [MSFT]" wrote:

no, the host controller by itself will not poll the device asking if it
has
data. it is up to you to always have a pending transfer on the IN
endpoint
so that the host controller is always asking for data. your device can
then
send back data when it has something to send.

d

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"pswork" <pswork@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:78DF78A7-1D8F-4F8E-B2D4-87D9CCB03369@xxxxxxxxxxxxxxxx
Thanks, that did it. If I may, have another question.

Using a single bulk address with both a IN and OUT endpoint. I am a
little
unclear on the device sending data to the host. When does the host
send
notifcation to the device that it is expecting data? In particular my
device
is monitoring some engine functions and based on some conditions will
asynchronously send status data to the host. I know a USB host
initiates
IN
data transfers. Does it periodically ask a device if it has any data
to
send?

Paul


"Doron Holan [MSFT]" wrote:

if you downloaded the latest WDK (6001) it comes with KMDF 1.7, which
would
be in wdfcoinstaller01007.dll. even then, you might have the 1.7
coinstaller b/c there was a servicing problem which delayed the
release
of
the coinstaller. You can download the kmdf coinstaller separately,

http://blogs.msdn.com/doronh/archive/2008/04/17/the-wdf-1-7-cointstallers-are-now-available.aspx

d

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"pswork" <pswork@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:A2FE7491-7DD4-46C9-8F22-68CBA34161F1@xxxxxxxxxxxxxxxx
I am trying to install WinUSB on XP. I think I have reviewed all
possible
documentation and am stuck. I installed WDK, used a sample INF from
a
Microsoft site, the WinUSB co-installer works fine, however the
KMDF
does
not. I do not have WdfCoInstaller01005.dll on my system nor can I
find
out
why or where to get it. Can you help?

[CoInstallers_CopyFiles]
WinUSBCoInstaller.dll
WdfCoInstaller01005.dll

"Doron Holan [MSFT]" wrote:

try the 1.5 versions from the 6000 WDK .. the installers you have
may
not
be
able to install downlevle (IIRC, rc2 has coinstallers which can
install
downlevel properly)

d

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"Neel" <Neel@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:F2FE6C0A-7267-45B7-897C-EC841E04E3B6@xxxxxxxxxxxxxxxx
Thanks dmm for your inputs.

I gone through many posting on the given link but my problem of
installing
the winusb.sys driver for the USB Stick is not solved (Using the
INF
file
details provided my microsoft in "WinUsb_HowTo.doc") .

I am using the following WDK files (WDK - Windows Server 2008
RC1)
for
the
installation on WinXP:
1). WinUSBCoInstaller.dll
2). WdfCoInstaller01007.dll
3). WUDFUpdate_01007.dll
& INF file from the ""WinUsb_HowTo.doc"

I am installing the driver from "Device Manager->Update Driver"
on
the
connected "USB Mass storage Device".
Intallation start copying & installing "WinUSBCoInstaller.dll" &
"WdfCoInstaller01007.dll" but at the end, it displays the
message
dialog
"Cannot install this hardware", "There was a problem installing
this
hardware".

Also, when I select the device in Device Manager and check the
driver
details, then I found that the WINUSB.SYS is NOT installed
(instead
the
default USBTOR.SYS is installed).

I think there is problem withe INF file only.
What could be the problem?
Is this INF file not proper?
Is the WDK files not proper?

Thanks
Neel


"dmm" wrote:

Hi Neel

I checked my notes and this is what I have:

Goto the OSR Online site

http://www.osronline.com/cf.cfm?PageURL=showlists.CFM?list=NTDEV
and
search
for "winusb." There is a lot of good information there on
editing
your
inf
file so that the co-installers will execute properly.

dmm

"Neel" wrote:

Hi dmm,

Please could you tell me, how did you install the winusb.sys?

I tried it 100 times but still not able to succeed.
I followed the instructions given in "WinUsb_HowTo.doc" which
is
from
Microsoft.
I tried it on internet with many options. But no use.

I am using USB stick (Pen drive) device for installation.

Thanks,
Neel

"dmm" wrote:

Thanks Don -- just like you said. During the
inf/installation
process, the
winusb.sys is extracted and copied to directory
"\windows\system32\driver."

dmm

"Don Burn" wrote:

Look in redist\winUSB the files are part of a
coinstaller.


--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
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"dmm" <dmm@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message

news:BA76B8CC-E1C4-4158-9B0D-0475D7949941@xxxxxxxxxxxxxxxx
Hi Don

I have installed WinDDK 6000 (which targets both vista
and
xp)
on
my PC.
I
search the entire DDK for files "winusb.sys" and
"winusb.dll"
but
I get
no
hits.

Thanks
dmm

"Don Burn" wrote:

WinUSB is part of the WDK see
http://www.microsoft.com/whdc/DevTools/WDK/WDKpkg.mspx
for
details how
to
.

Relevant Pages

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