Re: Help regarding DFU.
- From: "zyx" <vidhya_542001@xxxxxxxxxxx>
- Date: 15 Dec 2006 05:02:23 -0800
Hi Doron,
I have gone thru the KMDF architecture to an extent.I think so I can
pick up the remaining things while implementing it.Right now I need to
get the basic idea of what I should do.
My work is to upgrade the device firmware.I have gone thru USB Device
Firmware Upgrade Specification.
According to my understanding for upgrading the device,I need to reset
the device so that the next time the device enumerates as a DFU device.
WdfUsbTargetPipeFormatRequestForReset is a method I found in the
documentation to reset device.I dont know whether it is correct.correct
me if I am wrong.The spec for USB DFU says to reset the device.Does it
mean resetting the pipe,or someother thing which I dont know.
Does resetting the device take place in driver entry routine as the
driver gets loaded in driver entry routine.
My first aim is to upgrade.so I will be concentarting on the write path
rather than reading from the driver.
In the spec they have given that the firmware upgrdation takes place in
4 phases.
I am not able to get the function which takes place in enumeration
state.The question is ,
Is there anything special thing that happens only in DFU class driver
than other driver.Normally all the driver's first step is
enumeration.Do I need to do anything special in DFU.
It is said in the documentation that DFU class interface descriptor is
embbeded in the normal run time descriptor of the device.If this is
so,does all the usb drivers have support for DFU naturally.It is only
we who decide whether to do it or not.or should we modify anything in
the usb driver for it to support DFU class driver over it.
I am confused.
according to my understanding special thing that need to take place in
DFU is resetting the device so that it enumerates as DFU device.Once
upgrade is over again resetting it to normal mode.other functionalities
are similar to other drivers.either pass the IRP down the stack or
handle it.In this case I should concentrate the write path
ie,EvtIowritexxx funtion.
Could you clarify the above doubts.Am I in the right direction or
somewhere out of the line
I couldnt find more information regarding DFU in the net also.
Thanks in advance.
zyx wrote:
Hi Doron,
Thanks for your help.Right now I am going thru the KMDF architecture
and it details.
zyx
Doron Holan [MS] wrote:
i suggest you write your driver using KMDF, see
http://www.microsoft.com/whdc/driver/wdf/KMDF_pkg.mspx and then download the
WDK.
are you writing the firmware to the device via a HID interface? I don't
understand the connection between DFU and HID, they are 2 separate concepts
d
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"zyx" <vidhya_542001@xxxxxxxxxxx> wrote in message
news:1166013047.977083.6370@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi All,
Can anyone provide me any links that help in writing DFU class HID
driver.Any sample code such as framework.I dont know were to start.I
need to upgrade the firmware of my usb device when required.
I am new to windows driver.I jus know the skeleton of the driver,the
basic routines such driver entry,Add device routine,few dispatch
functionalities,not all etc.I jus know few terms in the driver and how
it works.
My requirement is to write a DFU class HID driver for a usb device.
My questions are:
How will I signal my usb device to re-enumerate.Is there any IRP_MN_XXX
to reset the device.If so from where will I send this IRP to
re-enumerate the device.If it is an IRP_MN_XXX definitely it should be
handled in dispatchpnp( ).what all this I need to take care if that
particular IRP is send.
Basically I am confused.where to start.
Could anyone help me in providing a skeleton code for a DFU class HID
driver
Thanks in advance.
It would be great if you help.
zyx
.
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