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Get a four port controller that supports port multipliers?
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Hi, All:
I have been developing the KMDF Mode USB device driver for the USB Full-Speed(USB 1.1) device.
I implemented the simple USB functions into the device. The device has one interface and one Interrupt IN endpoint. And it is a vendor-specific class device.
I also developed the KMDF Mode USB device driver for the device.
The device was enumerated with the driver normally and the continuous reader was polling the Interrupt IN endpoint periodically.
But, I noticed that the polling interval is different from the one that I expected. (I used Windows XP SP3 for the evaluations.)
I also checked the contents of descriptors with the USB protocol analyzer. But, they seemed to be correct. I also monitored them with WinDbg. The driver seemed to get the same decriptors as the device correctly.
There were the following relations between the setting value and the actual value for the polling interval.
Setting Value : Actual Value
20 msec : 15.999 msec
100 msec : 31.998 msec
255 msec : 31.998 msec
Does the KMDF continuous reader support the USB full-speed devices?
It is helpfull for me if someone could tell me how to solve this problem?
Thanks.
Yama Fuji.
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Hi,
I don't know the details of the USB protocols or any drivers in general, however your numbers resemble standard system clock periods. You might want and read my article on timers to get my meaning. My conclusion would be you won't get it any better, and you probably also don't need to.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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Dear Mr. Luc Pattyn:
Thank you for your comments to my problem.
My concern is that the KMDF device driver causes troubles on the USB device because of frequent interrupts. (Some USB devices do not want frequent interrupts.)
By the way, I polled the same question at the Microsoft Connect site
and received some responses from Microsoft.
If you are interrested in this issue, please refer to the FEEDBACK REPORT (BUG ID 418229).
I will control the Interrupt IN polling in the user mode application program intead of using the KMDF continous reader. I will refer to your article.
Thanks.
Yama Fuji.
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hi all,
In our company we are using 1mbps airtel broadband connection we are connecting the Lan connection connects via system ethernet card as IP address for other machines we chose as Default gateway thats is working fine ...we brought the BSNL DSL conncetion for 2 mbps in this Airtel also wants to work and BSNL also work.. how it can possible
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Why? Typical PC speakers use less power than the fans inside the box. What would be the point? For some real savings, I'd like a desk lamp that goes out when I leave the room...
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Anyone know what would be involved in hooking a USB cable from my laptop to some other computer, and using the laptop to serve as a keyboard for that other computer?
I know USB cables have an A & B side, so I'd have to do some connection jiggering, but I think it would be interesting project.
-Tzeppy
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That will be difficult.
For one, USB has a single master (normally the one and only PC) polling all the slave peripherals. In your set-up there would be two masters. And USB connectors enforce this single-master concept by being polarized, you can't physically connect two masters using commercially available cables.
However modifying a cable is only a small part of a possible solution. The protocol itself will fail with multiple masters. You basically have to turn your laptop-acting-as-keyboard into a USB slave device,
disable its plug-and-play logic, then make it send keyboard packets rather than receive them.
If and when you succeed, please do write a CodeProject article on the subject.
PS: I expect you also want to use the laptop's display as a monitor? over USB??
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
modified on Wednesday, February 25, 2009 7:44 AM
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You can't directly. There are programs (synergy[^] and multiplicity[^]) that will let you send keyboard/mouse input from one PC to a second over ethernet. In this setup the master's keyboard and mouse will be able to move the cursor across both systems (function is logically similar to a 2nd monitor), while the slave will only be able to control itself. These only work once the OS has booted and is running the app on both ends.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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Your best bet would be to get a development kit for a USB microcontroller (such kits are available for $100 or so) and then write code on the microcontroller to mimic a keyboard that is sending out the data you're after. The microcontroller could easily be programmed to send out keystrokes in response to any particular type of stimulus. If you need to have it do so in response to data from the laptop, you could use a serial port. If the evaluation board has an RS232-to-TTL convertor (many do) you might not even have to solder anything.
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What s the cost of 1 GB RAM ? (Indian Rupees)
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12.99 USD on Amazon.com[^] = 592.56 INR
That price is a fixed price to which all members of the UN agreed in the DDR2-RAM-Price-treaty of 2005. If anybody charges you more than 597.24 rupees for 1 GB of RAM, you should immediately call the police, since they try to trick you.
"I love deadlines. I like the whooshing sound they make as they fly by." (DNA)
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Hello sir ,
What s the cost of 1 GB DDR RAM ?
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$45.39 on amazon.[^] = 2070.54 idiotic retards.
The price is controlled by the same treaty as DDR2 pricing.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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muhammadafsal wrote: What s the cost of 1 GB DDR RAM ?
Two and a half camels. If you have just an elephant, that's fine too. In return you get one camel and two chicken change.
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hi , its depend on market and city.
in india you cat get it arround 800 or 900(1gb DDR2)
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I have my wifi network card set up in ap mode and my network card connected to the internet in shared mode. I want to allow a device to connect to my PC via the wifi and access to internet, but it doesn't work. The device can connect to the PC, but not the internet. Any ideas what I might be doing wrong?
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Well, if you haven't anything else set up, the two network connection are isolated. Each interface sees the PC, but not the other interface.
Enabling ICS (Internet Connection Sharing) might solve the problem. If that does not work, try installing routing software or setting up a network bridge.
See this website[^] for mor information.
Cheers,
Sebastian
--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton
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Thanks for the answer.
I tried the sharing thing, but unfortunately it doesn't work. If I set up the network bridge I lose the internet connection to my PC 
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I also tried installing nat32, but no good. I guess I'll just have to admit defeat and buy a wifi router
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Well, that's the cleanest approach. And it might save some energy.
You can even get a simple "NAS" with those routers. (Usually not really a NAS, but shared access to some flash memory, builtin or plugged in via USB).
Cheers,
Sebastian
--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton
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I've used the ICS approach in the past, but the performance was terrible. It's much cleaner and more reliable to use a WiFi access point and have all your clients connect directly to it.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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I have installed vista in my system in c drive .My hard disc space is 160gb and c drive occupies 92gb .But continouesly am lossing memmory from C drive .around 20 gb has been found lost .if anyone knows y it happens?Plz do reply
Thanks & Regards
VIJITH VIJAYAN
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It's because your harddrive is broken.
And it seems that your keyboard is broken too.
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