Re: [javax-usb-devel] Hang problem with UsbPipe.syncSubmit(byte[])

SourceForge Headquarters 1320 Columbia Street Suite 310 San Diego, CA 92101 +1 (858) 422-6466

<HTML><HEAD><TITLE>Samsung Enterprise Portal mySingle</TITLE>
<META content=IE=5 http-equiv=X-UA-Compatible>
<META content="text/html; charset=euc-kr" http-equiv=Content-Type>
<STYLE id=mysingle_style type=text/css>P {
	MARGIN-BOTTOM: 5px; FONT-SIZE: 12pt; FONT-FAMILY: 굴림체, arial; MARGIN-TOP: 5px
}
TD {
	MARGIN-BOTTOM: 5px; FONT-SIZE: 12pt; FONT-FAMILY: 굴림체, arial; MARGIN-TOP: 5px
}
LI {
	MARGIN-BOTTOM: 5px; FONT-SIZE: 12pt; FONT-FAMILY: 굴림체, arial; MARGIN-TOP: 5px
}
BODY {
	FONT-SIZE: 12pt; FONT-FAMILY: 굴림체, arial; MARGIN: 10px; LINE-HEIGHT: 1.4
}
</STYLE>

<META name=GENERATOR content=ActiveSquare></HEAD>
<BODY>
Thanks for your great support.
I tried below as suggested:-
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;int maxPacketSize = outUsbPipe.getUsbEndpoint().getUsbEndpointDescriptor().wMaxPacketSize( ); &nbsp;&nbsp;&nbsp;&nbsp;log("Max Packet Size: " + maxPacketSize); &nbsp;&nbsp;&nbsp;&nbsp;final byte[] buffer = new byte[8192];
&nbsp;&nbsp;&nbsp;&nbsp;for (int offset=0; offset&lt;buffer.length; offset+=maxPacketSize) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final UsbIrp usbIrp = outUsbPipe.createUsbIrp( ); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;usbIrp.setData(buffer, offset, maxPacketSize);
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//Asynchronously submit the UsbIrp to UsbPipe
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("==&gt; Asynchronously submitting the UsbIrp to UsbPipe ..."); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;outUsbPipe.asyncSubmit(usbIrp);
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//Wait for the UsbIrp to complete &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("Waiting for the UsbIrp to complete ..."); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;usbIrp.waitUntilComplete();
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("!!! Successfully submitted the UsbIrp to UsbPipe ..."); &nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;
But after successfully executing the loop for 3 times, it goes stuck on waitUntilComplete() as below-
&nbsp;
Max Packet Size: 512 ==&gt; Asynchronously submitting the UsbIrp to UsbPipe ... Waiting for the UsbIrp to complete ... !!! Successfully submitted the UsbIrp to UsbPipe ... ==&gt; Asynchronously submitting the UsbIrp to UsbPipe ... Waiting for the UsbIrp to complete ... !!! Successfully submitted the UsbIrp to UsbPipe ... ==&gt; Asynchronously submitting the UsbIrp to UsbPipe ... Waiting for the UsbIrp to complete ... !!! Successfully submitted the UsbIrp to UsbPipe ... ==&gt; Asynchronously submitting the UsbIrp to UsbPipe ... Waiting for the UsbIrp to complete ... 
&nbsp;
I even put a UsbPipeListener before the above code&nbsp;to poll the UsbPipeDataEvent on Input UsbPipe but failed to receive any&nbsp;event.
&nbsp;
final UsbPipeListener listener = new UsbPipeListener() {
&nbsp;&nbsp;&nbsp;&nbsp;@Override &nbsp;&nbsp;&nbsp;&nbsp;public void errorEventOccurred(UsbPipeErrorEvent event) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// TODO Auto-generated method stub
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;@Override &nbsp;&nbsp;&nbsp;&nbsp;public void dataEventOccurred(UsbPipeDataEvent event) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int transferLength = event.getActualLength(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("UsbPipeDataEvent occurred on IN UsbPipe with data size " + transferLength);
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//Asynchronously read the status in byte[] from IN UsbPipe &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("Asynchronously reading the status in byte[] from IN UsbPipe ..."); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UsbIrp irp = inUsbPipe.asyncSubmit(new byte[transferLength]);
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//Wait for the UsbIrp to complete &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;log("Waiting for the reading to complete ..."); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;irp.waitUntilComplete(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;}; &nbsp;inUsbPipe.addUsbPipeListener(listener);
&nbsp;
------- Original Message ------- Sender : Dan Streetman&lt;dds...@ie...&gt; Date&nbsp;&nbsp; : Oct 02, 2013 22:31 (GMT+09:00) Title&nbsp; : Re: [javax-usb-devel] Hang problem with UsbPipe.syncSubmit(byte[]) On Wed, Oct 2, 2013 at 6:23 AM, SANJAY GUPTA &lt;gup...@sa...&gt; wrote: &gt; Hi All, &gt; &gt; Please look below the sample scenario:- &gt; &gt; final byte[] outData = new byte[] { &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x04, (byte) 0x05, (byte) 0x06, (byte) 0x07, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x08, (byte) 0x09, (byte) 0x0A, (byte) 0x01B, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x0C, (byte) 0x0D, (byte) 0x0E, (byte) 0x0F, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x04, (byte) 0x05, (byte) 0x06, (byte) 0x07, &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00 } &gt; final byte[] inData = new byte[13]; &gt; &gt; log("Synchronously submitting the byte[] to UsbPipe ..."); &gt; outUsbPipe.syncSubmit(data); &gt; &gt; //Synchronously read the status from IN UsbPipe &gt; log("Synchronously reading the status from IN UsbPipe ..."); &gt; inUsbPipe.syncSubmit(inData); &gt; &gt; This code is working fine but I am facing problem if I want to change (reduce/reduce/modify) the outData. &gt; The control gets hang on reading the status data from the Input UsbPipe. &gt; Any suggestion on below points will be helpful:- &gt; 1. Is there any specific data format (may be starting header) in the actual data being transferred? Data formats are entirely up to the device, unless the device implements a higher level spec (like HID, mass storage, etc) that itself contains the API for the data format.&nbsp; USB doesn't specify any data format at all,&nbsp; except for the control pipe 8-byte setup packet that must preface each control transfer, and the various default control pipe standard requests (set interface, clear stall, etc). 
===&gt; Thanks A lot. I am using a mass-storage device and BULK type UsbEndpoint for data transfer.
But the problem is, suppose I keep the value of outData[8] as non-zero with all other things intact, the submission gets hanged which never completes.
And then I have no choice but the unplug the device. &gt; 2. What is the data size which can be transferred using single invocation of syncSubmit()? it's been a while, but IIRC there's no limit in java, although I think the platform may enforce limits.&nbsp; I don't really remember the details though.&nbsp; For interrupt pipes, you of course should usually submit exactly the pipe size (wMaxPacketSize). 
===&gt;&nbsp;Mass-storage device and BULK type UsbEndpoint. &gt; 3. What is the status data size which is received on Input Pipe as a result of out data transfer? it's entirely dependent on your device.&nbsp; although if your input pipe is an interrupt pipe, it should be the wMaxPacketSize from the endpoint descriptor. Also, assuming your input pipe is interrupt type, it's probably better for you to keep a buffer on it, which will cause continuous polling of the device, as required by spec when the device is in use.&nbsp; You can do that either with a separate Thread that does nothing except syncSubmit() a buffer or irp to the pipe, then passes the returned data off somewhere else to process and immediately syncSubmit() a new buffer, or you can use asyncSubmit() with either a listener on the pipe or a separate Thread to waitUntilComplete() for the irp, and then also hand off the returned data to process somewhere else and immediately sync or async submit again a new buffer.&nbsp; With asyncSubmit(), you can submit multiple buffers, which is better because it keeps the low level platform queued up with buffers so that the device polling never stops, and you don't have to try to be quite so fast at resubmitting a new buffer. 
===&gt;&nbsp;Mass-storage device and BULK type UsbEndpoint.
 &gt; &gt; Thanks in Advance.. &gt; Sanjay Gupta &gt; &gt; ------------------------------------------------------------------------------ &gt; October Webinars: Code for Performance &gt; Free Intel webinars can help you accelerate application performance. &gt; Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from &gt; the latest Intel processors and coprocessors. See abstracts and register &gt; &gt; http://pubads.g.doubleclick.net/gampad/clk?id=60134791&amp;iu=/4140/ostg.clktrk &gt; _______________________________________________ &gt; javax-usb-devel mailing list &gt; jav...@li... &gt; https://lists.sourceforge.net/lists/listinfo/javax-usb-devel <IMG style="DISPLAY: none" border=0 src="http://ext.samsung.net/mailcheck/SeenTimeChecker?do=5b5b806e569672b08cefaf4d8420c5e41c40cf68e6889fd228f41a3773fe88f8a28a0f20ff0f747d3545973b7b0cb61b980b3871b38ac66662d74ed859d628c32758cd62c5cf0684a728c55b39cc59eacf878f9a26ce15a0" width=0 height=0> 
&nbsp;
<TABLE id=confidentialsignimg>
<TBODY>
<TR>
<TD NAMO_LOCK>
<IMG border=0 src="cid:XOK...@na..." width=520></TD></TR></TBODY></TABLE></BODY></HTML><img src='http://ext.samsung.net/mailcheck/SeenTimeChecker?do=5b5b806e569672b0bc92d2761ed4130879e64b9460f8cf0c28f41a3773fe88f8a28a0f20ff0f747d3545973b7b0cb61b980b3871b38ac66662d74ed859d628c32758cd62c5cf0684a728c55b39cc59eacf878f9a26ce15a0' border=0 width=0 height=0 style='display:none'>