Hello,
Following is a part of my code for sending SET_ and GET_REPORT's to the USB
Device. When I try to send the GET_REPORT request after having sent the
SET_REPORT to the DCP, i get a DCP Submission failed error. Could anyone
tell me where the problem is?
UsbConfiguration config = usbDevice.getActiveUsbConfiguration();
List interfaces = new ArrayList();
interfaces = config.getUsbInterfaces();
UsbInterface interface0 = (UsbInterface)interfaces.get(0); // my device
has only one interface, i.e, 0
try{
interface.claim(new UsbInterfacePolicy() {
public boolean forceClaim(UsbInterface
usbInterface){
return true;
}
});
UsbInterfaceDescriptor interfaceDescriptor =
interface0.getUsbInterfaceDescriptor();
Byte iClass = new Byte(interfaceDescriptor.bInterfaceClass());
System.out.println("Interface Class is: " + iClass.toString()); //
It gives me 3, meaning a HID class device
}catch(Exception e){
System.out.println("Interface not claimed! Exception! " +
e.getMessage());
}
//SET_REPORT
byte bmRequestType = 0x21; <request type for SET_REPORT>
byte bRequest = 0x09; <SET_REPORT: 0x09>
short wValue = 0x0201; <i/o type: OUT, 02><report number:01>
short wIndex = 0; <Interface number :0>
byte[] sendBuffer = {0x01,0x00,0x06,0x22,(byte)0xA0,(byte)0x85,0x00};
<ByteStream command to be sent to the device>
UsbControlIrp controlIrp1 = usbDevice.createUsbControlIrp(bmRequestType,
bRequest,wValue,wValue,wIndex);
controlIrp1.setData(sendBuffer);
if(!sendUsbControlIrp(usbDevice, controlIrp1)){
System.out.println("SET_REPORT Not sent successfully");
}
System.out.println("Bytes sent to the device for SET_REPORT: " +
controlIrp1.getActualLength());
//GET_REPORT
byte bmRequestType = 0xA1; <request type for GET_REPORT>
byte bRequest = 0x01; <GET_REPORT: 0x01>
short wValue = 0x0101; <i/o type: IN, 01><report number:01>
short wIndex = 0; <Interface number :0>
byte[] recieveBuffer = new byte[22]; <I Assume this is the buffer where
our requested data would come into, it is of 22 bytes>
UsbControlIrp controlIrp2 = usbDevice.createUsbControlIrp(bmRequestType,
bRequest,wValue,wValue,wIndex);
controlIrp2.setData(sendBuffer);
if(!sendUsbControlIrp(usbDevice, controlIrp2)){
System.out.println("SET_REPORT Not sent successfully");
}
System.out.println("Bytes sent to the device for GET_REPORT: " +
controlIrp2.getActualLength());
I am not able to find out why i am not able to make the GET_REPORT request
to the device after having sent the SET_REPORT request. Could anyone help me
on this please!
Also, my USB RFID Reader has just 1 IN_Interrupt pipe from where the data
originates. When i issue the GET_REPORT to the DCP, do I get the report via
the DCP or do I have to use the UsbPipe of the In_Interrupt pipe to read the
tag information?
Please help needed! I am stuck!
Regards and thanks in advance!
Rahul Bourothu
On 8/7/08, 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
>
--
Rahul Bourothu
School of Engineering and Applied Science,
University of Pennsylvania,
Philadelphia, PA - 19104
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