Dan,
I have figured out the way yesterday. First, i issue my read command to the
device on the DCP and then open the pipe. Then use a UsbIrp to read from the
pipe. I am able to communicate with the device!!
But, there is one problem. When i try to put this in a loop until i get the
necessary information, that is if i try to asyncsubmit the UsbIrp to the
pipe, i get a message saying " cannot submit: isComplete is true" . Do i
need to create a new UsbIrp everytime i have to submit to the pipe?
Thank you!
Regards
Rahul Bourothu
On 8/12/08, Dan Streetman <[EMAIL PROTECTED]> wrote:
>
> I can't help with figuring out the protocol for your device, but I
> would suggest that you read the javadoc for UsbControlIrp and UsbIrp
> so you will know how to use them for input and output. Specifically
> the input data will not get filled up if you leave it empty; but you
> really should read all the javadoc to understand it - it's really not
> that much.
>
> On Thu, Aug 7, 2008 at 2:38 PM, Bourothu Rahul <[EMAIL PROTECTED]>
> wrote:
> > Hi,
> >
> > I am using a USB RFID Reader to read the EPC code associated with a RFID
> tag
> > on a Linux platform(using JSR80). The device uses ByteStream Protocol to
> > communicate with the host. This protocol requires use of HID Report
> number
> > 1.
> > The read tag command as provided in the device specification is :
> > <01><00><06><22><A0><85><00>
> >
> > I believe I have to use SET_REPORT(to send control) and GET_REPORT(to
> > recieve data) to enable communication.
> >
> > In order to issue the read tag command, i am using the following header
> > values(from the usb 1.1 HID specification):
> >
> > bmRequestType: 0x21
> > bRequest: 0x09 (SET_REPORT, to the device)
> > wValue: 0x0201 (<I/O Type><Report Number>)
> > wIndex: 0x0000 (Interface number)
> > wLength: 0x07 (Number of Bytes to send to the device)
> > Data: <01><00><06><22><A0><85><00>
> >
> > I wrap this data in a UsbControlIrp, and send it to the device using
> > syncSubmit method.
> >
> > Later i have to read the report from the device using GET_REPORT. For
> this I
> > would use the headers as follows:
> > (The INPUT Report from the device would be of size 22 bytes)
> > bmRequestType: 0xA1
> > bRequest: 0x01 (GET_REPORT, from the device)
> > wValue: 0x0101 (<I/O Type><Report Number>)
> > wIndex: 0x0000 (Interface number)
> > wLength: 0x16 (Number of Bytes to be recieved from the
> device,
> > 22 in HEX)
> > Data: <empty> < I assume the data read from the device
> > will be stored here>
> >
> > I again wrap this data in a UsbControlIrp and send it to the device using
> > syncSubmit method.
> > Is my approach correct or am I going wrong somewhere?
> >
> > Please let me know!
> >
> > Thank You
> > Regards
> > Rahul Bourothu
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>
--
Rahul Bourothu
School of Engineering and Applied Science,
University of Pennsylvania,
Philadelphia, PA - 19104
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