2009/3/25 wind sh <chicagoshw...@yahoo.com>:
> a. your answer ....Probably the device doesn't send you any data
> my question: does my program capture/read data in correct way ? any
> thing wrong for my provided code (speciallly inside the loop...)? as my
> expection, no matter device receive the data from pipe or not, the loop
> should print 2...but hang after first time..
You have to *understand* your device's protocol. you can't just throw
a buffer to it and hope something happens.
> b.your answer for my question of 'HID devive'....You might be able to read
> your device's HID report descriptors (which you have not printed below) to
> find out how to talk to your device
> ...
> my question: how can i access device's HID report descriptors? i
> check all the classes of javax-usb, but no class/interface refer to HID
> report descriptors..
READ THE HID SPEC. I won't say it again. I sent you the specific
link to the PDF. Read it.
>
> tks in advance again.
>
> john
>
>
> --- On Wed, 3/25/09, Dan Streetman <ddstr...@ieee.org> wrote:
>
> From: Dan Streetman <ddstr...@ieee.org>
> Subject: Re: [javax-usb-devel] USB pipe read hang
> To: chicagoshw...@yahoo.com
> Cc: javax-usb-devel@lists.sourceforge.net
> Date: Wednesday, March 25, 2009, 3:50 PM
>
> Probably the device doesn't send you any data...
>
> 2009/3/24 wind sh <chicagoshw...@yahoo.com>:
>>
>> I get stuck at reading data from USB pipe.
>>
>> my program can correctly locate the attached USB device, and print its
> info
>> as well.
>> but, when try to read data from the pipe, nothing happen, what wrong
> could
>> be..?
>> how can i debug to see the device received the data from remote wireless
>> device?
>>
>> tks in advance
>>
>> john
>>
>>
>> the output of my program:
>>
> ----------------------------------------------------------------------------------------
>> Device endpoint info
>> Device's getDirection->-128
>> Device's getType->3
>> Device's getUsbEndpointDescriptor->bLength : 7
>> bDescriptorType : 0x05
>> bEndpointAddress : 0x81
>> bmAttributes : 0x03
>> wMaxPacketSize : 64
>> bInterval : 1
>>
>> pipe read start
>> loop= 1
>>
>> ***** but nothing happen after that, just hang.
>>
>>
>>
>> the partial source code of my program
>>
> ----------------------------------------------------------------------------------
>>
>> /* probe=an attached USB interface that is defined and located */
>>
>> UsbConfiguration config=probe.getActiveUsbConfiguration();
>> UsbInterface
> theInterface=config.getUsbInterface((byte)0);
>> theInterface.claim(new UsbInterfacePolicy(){ public
> boolean
>> forceClaim(UsbInterface usbInterface) { return true;} });
>> UsbEndpoint endpoint=(UsbEndpoint)
>> theInterface.getUsbEndpoints().get(0);
>> System.out.println("Device endpoint
> info\n");
>> System.out.println("Device's
>> getDirection->"+endpoint.getDirection());
>> System.out.println("Device's
> getType->"+endpoint.getType());
>> System.out.println("Device's
>> getUsbEndpointDescriptor->"+endpoint.getUsbEndpointDescriptor());
>> UsbPipe pipe=endpoint.getUsbPipe();
>> UsbIrp irp=pipe.createUsbIrp();
>> byte[] input=new byte[64];
>> irp.setData(input);
>> pipe.open();
>> System.out.println("pipe read
> start\n");
>> int loop=0;
>> outer:while (true) {
>> loop++;
>> System.out.println("loop=
> "+loop);
>> pipe.syncSubmit(irp);
>> System.out.println("input 0=
> "+input[0]);
>> System.out.println("input 1=
> "+input[1]);
>> if (loop==10)
>> break outer;
>> irp.setComplete(false);
>> }
>> System.out.println("pipe read end\n");
>> pipe.abortAllSubmissions();
>> pipe.close();
>> theInterface.release();
>>
> ------------------------------------------------------------------------------------------------------------------------
>>
>>
>>
>>
>>
>>
>>
> ------------------------------------------------------------------------------
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>>
>>
>
>
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