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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