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Hi,
i have analog voltage ranging -12v to +12. Need to know that
can i use ADC0804 (8-bit) which results in res=0.09v
or 0804 only work for voltages ranging 0-5v.
Also as i have to convert two separate analog inputs, should i use two 0804 for this purpose ? or 0808.
and what should be the sample rate for achieving 10Mhz bandwidth to be transmitted to PC????
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If there are two mouses(A,B) pluged in a computer, I wonder how to distinguish A from B.
 plz help me
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I am confident that it's not possible to determine which mouse produced the input messages from usermode ring-3.
However, it might be possible at ring-0... by implementing a mouse filter driver which connected to \\Device\\PointerClass0 and other pointerclass input devices on the chain. But I can only imagine the chaos when multiple pointer devices are moving at the same time. Sounds a bit difficult even at this level to me.
But if you want to explore, the sample code in the Microsoft DDK at: C:\WINDDK\3790.1830\src\input\moufiltr could be modified to research this idea.
Best Wishes,
-Randor (David Delaune)
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CAN ANY ONE TELL ME IS THERE ANY FREE VERSION OF THE ddK2000/XP? AND IF THERE THEN WHERE TO GET IT?
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Did you even bother to try google? The first listing when searching on "windows ddk 2000 xp" led me to the DDK page which directly leads to the "which ddk to use" page which leads directly to the "how to get it" page.
Since I've already down your work for you, here's your answer:
How to Get the Windows Driver Kit and the Windows Logo Kit[^]
The program is free. FYI, the DDK has been rolled into the WDK.
If you insist on not joining the program, less than five minutes of surfing on the MS site found:
DDK - Windows Driver Development Kit[^]
Despite their names, both of these support drivers back to W2K
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HI MANY MANY THANKS FOR YOUR HELP
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There seems to be something wrong with your CapsLock key. YOU'RE SCREAMING YOUR HEAD OFF IN THE FORUMS!! Shhhh... quiet. People are trying to think around here.
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hi out there,
i don't know if i'm at the right place with my problem, but i will try. i tried weeks ago some times the usb forum (http://www.usb.org/phpbb/index.php) but these nice guys are not activating any new user accounts 
ok, is it possible to make an usb keyboard emulation, that means connecting 2 pc over usb or rs232 to usb, one pc has no keyboard and will be feeded with keyboard signals from the other pc over the usb connection... if yes, has any one good hints (internet pages, etc) how to do it?
regards
criss
-- modified at 10:50 Monday 10th September, 2007
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The key strokes can be captured and injected at the source/destination PCs using global system hooks, but you can't just run a 'USB crossover cable' between them and call it done. You absolutely would need to write device drivers and AFAIK you'd also need a hardware device of some sort in the middle. Sending the data via ethernet would be much easier, and if for some reason the machines don't have ethernet cards and can't have them added you can buy USB to ethernet adaptors.
--
If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
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hm... so such a hardware device is definitively necessary because a direct usb-usb or rs232-usb connection is not possible (electric/hardware/conversion issues)? also if all the device driver stuff is done?
regards,
criss
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You could use a pair of USB-RS232 adapters and an RS232 cable without needing any to write any drivers and just use standard rs232 code. But be forewarned USB-RS232 adapters have a reputation of both being flaky and only implementing the more common parts of the spec.
--
If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
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hey all. i was wondering if i could get a bit of advice . Im a final year robotics student and i've just had a new idea for my dissitation project, but im not sure if its viable. The part im unsure of would be a custom usb keyboard feeding text into a c++ application.
I have a basic understanding of c++, some asm programming via a 8051 processor and i've just ordered some usb interfacing books, to help me along with creating a driver and bus. I should be able to manage it for a pc, but could the same driver and software work on a pda running windows and usb otg ?(although i know otg bus is diffrent, but back compatible form usb)
As i said i haven't really researched into it yet, so it's just off the top of my head at the moment. Any advice or points to references would be great.
cheers.
Lucas.
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according to me you should first understand the device driver for your k/B..
to develop a driver for windows environment you should download Driver Development Kit by Microsoft
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Hi,
I am working on VS 2005 on Vista Platform and also have Vista SDK on my system.
All I want is to be able to handle any notification events on my Ethernet Network adapter.
These could be Ethernet Cable Pluged-in, Pluged-out, in each of these cases, an notification has to be sent.
I know that this can be achieved by registering a callback function with that Port/Network adapter ( I get the Port/Adapter info by calling the native API GetAdaptersAddresses( )
Once any event on the adapter occures, the callback function will be invoked and recieve the event for which the callback was called.
Can anybody please tell me as to how do I register/associate an Callback/event handling function with an Adapter using native Vista API's??
Any guidance will be of great help.
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Marimuthu.pesit wrote: These could be Ethernet Cable Pluged-in, Pluged-out, in each of these cases, an notification has to be sent.
I know that this can be achieved by registering a callback function with that Port/Network adapter ( I get the Port/Adapter info by calling the native API GetAdaptersAddresses( )
No, it doesn't. At least not for the "events" you specified. The functions you're referring to are under the IP Helper section of the API and don't have anything to do with the physical connection of the adapter. They have to do with the TCP/IP stack and it's relation to the adapter.
The events you're talking about come under the System Event Notification Service[^].
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Hi Dave,
Thanks for the response.
Is there any code snippet or a sample application that I could
refer to??
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I don't know of any. System Event Notification Services is a pretty obscure API to use. I haven't been able to find any examples.
But, about 3 minutes of research finds hat SENS is installed automatically with every version of Windows after NT4, AND it exposes a COM library you can use in your code.
Start your project and open the Project properties. Click the References tab and in the dialog that shows up, click on the COM tab. Scroll down the list and find the "SENS Events Type Library". Double click on that line to add the reference. You can now use SENS as if it where a normal class in the .NET BCL.
All you have to do is add a class-level Dim to create a SENS object and then create the event handlers.
Dim WithEvents sens As New SensEvents.SENS
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If your net card driver supports WMI, then you could write an app that gets the WMI data off the card.
Otherwise, you will need to write a protocol driver. Its not too hard. You then write an app which tells the protocol driver which OID to query (all Network card drivers must suport OIDs. OIDs (look in the DDJ for details) return data such as link speed, media state (cable in or out) tx packets etc etc etc.
Your app then displays the data from that OID. (Actually, WMI is just an extension of the OIDs allowing them to be acessed by user mode apps)
Protocol drivers are pretty easy to write, there are samples in the DDK, if not I can send you some code.
Truth is the subjection of reality to an individuals perception
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A sample application or a code snippet will be of great help to understand the way things have to be approached/implemented.
Thanks & Regards
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Google, or even CP, you should be able to find WMI sample code easially enough. If not, then use MSDN.
Truth is the subjection of reality to an individuals perception
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Hi, if there is anyone here with more than a week's VHDL experience, could you help me by telling me why the code below gives this error:
Error: Can't resolve multiple constant drivers for net y.s1 at Vending.vhd(54)
Here is the process: Both U and O are inputs, STATE is a signal representing the current state of the Finite State Machine.
PROCESS ( U, O)
BEGIN
CASE STATE IS
WHEN S4 =>
IF O = '1' THEN
y <= S5;
END IF;
WHEN S6 =>
IF O = '1' THEN
y <= S7;
ELSIF U = '1' THEN
y <= S8;
END IF;
WHEN OTHERS =>
y <= y;
END CASE ;
END PROCESS ;
Regards
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
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VHDL is plenty mysterious but one of the good people here has taken a look at the code you posted. The only thing obviously wrong with it is that STATE should be in the sensitivity list PROCESS ( U, O, STATE )
That does not account for the error though. You probably need to post at least the code referring to y.s1 to get a better answer.
Apparently your code looks combinatorial rather than clocked. Someone who understands this stuff will likely need to know that for sure to help you.
Sorry that's all I can do, my regular VHDL guru is on holiday for the next 2 weeks.
Nothing is exactly what it seems but everything with seems can be unpicked.
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I took it to my lecturer last night and he said that I'm creating an asynchronous STATE MACHINE instead of a synchronous one. Is it really required to have all SIGNALS in the sensitivity list? I noticed the warnings but couldn't understand why you would always want all your SIGNALS in the sensitivity list.
Anyway, my code had another process which was sensitive for 'clock' and 'reset', I pushed all the code from the process in my OP into that process and everything works.
_______________________________________________________________________
http://www.readytogiveup.com/[ ^]
"you can't forget something you never knew..." M. Du Toit
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Yes it is absolutely necessary to have all needed signals in the sensitivity list for simulating RTL. They don't have to be there for synthesis though.
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Hey
I have a Sony VAIO that came with a 120GB HDD however this has given up the ghost so I have bought a 250GB drive. When I come to install all my Sony software it errors saying it is not the correct hardware setup.
Is there any way of tricking it into beleiving it is the correct system specification or do I need another identical 120GB drive if I wish to continue using my Sony software?
Thanks
Dan
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