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(); >> > ------------------------------------------------------------------------------------------------------------------------ >> >> >> >> >> >> >> > ------------------------------------------------------------------------------ >> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are >> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and >> easily build your RIAs with Flex Builder, the Eclipse(TM)based development >> software that enables intelligent coding and step-through debugging. >> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com >> _______________________________________________ >> javax-usb-devel mailing list >> javax-usb-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/javax-usb-devel >> >> > > > ------------------------------------------------------------------------------ > > _______________________________________________ > javax-usb-devel mailing list > javax-usb-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/javax-usb-devel > > ------------------------------------------------------------------------------ _______________________________________________ javax-usb-devel mailing list javax-usb-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/javax-usb-devel