On Tue, Aug 12, 2008 at 11:21 AM, Bourothu Rahul <[EMAIL PROTECTED]> wrote: > 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?
short answer: yes. long answer: you can "clear" the irp's fields if you really want to reuse it. But it's much faster and easier to just create a new one - java has very good GC these days. > > 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 >> > >> > ------------------------------------------------------------------------- >> > This SF.Net email is sponsored by the Moblin Your Move Developer's >> > challenge >> > Build the coolest Linux based applications with Moblin SDK & win great >> > prizes >> > Grand prize is a trip for two to an Open Source event anywhere in the >> > world >> > http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> > _______________________________________________ >> > javax-usb-devel mailing list >> > javax-usb-devel@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/javax-usb-devel >> > >> > > > > > -- > Rahul Bourothu > School of Engineering and Applied Science, > University of Pennsylvania, > Philadelphia, PA - 19104 > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > javax-usb-devel mailing list > javax-usb-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/javax-usb-devel > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ javax-usb-devel mailing list javax-usb-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/javax-usb-devel
