Re: How to: multi device on USB

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Denis @ TheOffice wrote: 
I thought I meant "a multi interface device"
But now you are getting me confuse with "a composite device"

I have another question then : Which one is better ?

They are very different. Multiple interfaces per function, multiple functions per physical device. A function has one active interface at a time while a composite device has more than one function, each of which can have multiple interfaces. Each function can be concurrently active.

So you are asking a somewhat silly question. It depends on what you want. From your description below you want a composite device. If your device is designed correctly you support it with two separate device drivers, each independently managing their own functions. See the ddk docs for composite usb devices.


Here is what I am trying to do ?
On my device I want to support a memory card (mass storage) as well as a bulk device with a custom
WDM driver which is already working.

If you need more info pls let me know.

Denis

P.S. I have no idea what is the exact requirements as I never done that before.
Thanks




"Doron Holan [MS]" <doronh@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:OssdTqXFGHA.1180@xxxxxxxxxxxxxxxxxxxxxxx

what do you mean by a multi device?  a multi interface device?  a composite
device?

d

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"Denis @ TheOffice" <denisco@xxxxxxx> wrote in message
news:1136822861.192584@xxxxxxxxxxxxxx

Hi,

I developed a usb device with it's driver.
I have read books about USB drivers.

-    W2K Device Driver Book
-    OneySoft Programming WDM
-    Writing Windows WDM Device Drivers

The thing is they don't talk much about multi device on USB.

And I need to develop a multi device on USB.
I have no idea where to look.
I did not find any example on the DDK either.

I would appreciate if some body  could refer me to some documentations?

Regards,
Denis







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