You should probably send (asyncSubmit or syncSubmit in another Thread) the
in-direction IRP. Normally devices expect to be able to send back input
data as soon as it's ready. If you don't submit an in-IRP, the device
cannot send back input data until you give it a buffer (IRP).
The best thing to do is submit one (or better, multiple) IRPs on the
in-pipe. Then you could use a listener on the in-pipe to resubmit a new
IRP when one completes, and process the incoming IRP.
After that is set up, send your output.
On Sat, 6 Nov 2004, Navjot Singh wrote:
>hi,
>
>I am just 1 week conversant with usb and dont know much details. I am
>writing a program to communicate with GSM modem connected to PC with
>USB cable.
>
>No matter which AT command i send to my gsm modem, it returns the same
>2 byte response to me. Response is 1` (0x31 0x60).
>
>_SETUP_
>0. Intel x686 m/c.
>1. Suse Linux 9.0. Kernel 2.4.16
>2. Falcom (Seimens MC35) GSM modem with usb cable.
>3. UHCI controller.
>4. /proc/bus/usb/devices shows my device with correct details.
>5. I have been able to print my complete usb topology which shows that
>i have IN and OUT endpoints with BULK type.[maxpktsize = 64]
>
>My Code to submit data and get response (exceptions and log stmts removed)
>
>public String submitData(byte[] reqData){
> UsbIrp irp = outPipe.createUsbIrp(); // outPipe means host to device
> irp.setData(irp);
>
> outPipe.syncSubmit(irp);
> if(1 > irp.getActualLength())
> throw new UsbCommException("packet sending failed");
> else
> {
> Thread.sleep(1000);
> byte[] resData = new byte[540];
> UsbIrp inIrp = inPipe.createUsbIrp();
> inIrp.setData(resData);
> int totalBytes = 0;
> int bytesRead = 0;
> do{
> inPipe.syncSubmit(inIrp);
> bytesRead = inIrp.getActualLength();
> totalBytes += bytesRead;
> } while(!inIrp.isComplete())
> }
> return new String(resdata,0,totalBytes);
>}
>
>Is this method correct to send and receive data from usb device?
>
>Now, if i send whatever reqData. (I tried sending ATZ, AT&F, AT,
>AT+CPIN=?), this method always returns same 2 byte response i.e 0x31
>0x60.
>
>What's wrong here? Please help. Any comments will be helpful.
>
>regards
>Navjot Singh
>
>
>-------------------------------------------------------
>This SF.Net email is sponsored by:
>Sybase ASE Linux Express Edition - download now for FREE
>LinuxWorld Reader's Choice Award Winner for best database on Linux.
>http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click
>_______________________________________________
>javax-usb-devel mailing list
>[EMAIL PROTECTED]
>https://lists.sourceforge.net/lists/listinfo/javax-usb-devel
>
--
Dan Streetman
[EMAIL PROTECTED]
---------------------
186,272 miles per second:
It isn't just a good idea, it's the law!
-------------------------------------------------------
This SF.Net email is sponsored by:
Sybase ASE Linux Express Edition - download now for FREE
LinuxWorld Reader's Choice Award Winner for best database on Linux.
http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click
_______________________________________________
javax-usb-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/javax-usb-devel
