[javax-usb-devel] Robust ?

nicolas . courte Sat, 20 Nov 2004 09:42:11 -0800

Hello,

For my personal project, I am trying to submit data to a device (digital camera), suing syncSubmit(). It works fine with one syncSubmit(), and after, I turns off this device. But if this program suing a lot of syncSubmit(), sometimes it fails on "could not submit IRQ...".

To understand this problem, I start with DefaultControlPipe and I add a loop in as follows :

public class DefaultControlPipe {

public static void main(String argv[]) {

…

boolean noerror = true;

for (int i = 0; noerror && i < 100; i++) {

dump("n°" + i);

* Show how to communicate using the StandardRequest utility

* class.

noerror = showStandardRequestCommunication(usbDevice);

/* Show how to communicate using UsbControlIrp objects. */

noerror = showUsbControlIrpCommunication(usbDevice);

// stop on error or if i==99

}

…

With this program, I have the same error. I give the log with -DJAVAX_USB_MSG_LEVEL=DEBUG3 :

n°3

LOG:[xfer](4) JavaxUsbDeviceProxy.c.Java_com_ibm_jusb_os_linux_JavaxUsb_nativeDeviceProxy[75] Got Request

LOG:[xfer](5) JavaxUsbDeviceProxy.c.submitRequest[124] Submitting Request.

LOG:[xfer](5) JavaxUsbDeviceProxy.c.submitRequest[128] Submitting Pipe Request.

LOG:[xfer](4) JavaxUsbPipeRequest.c.pipe_request[63] Submitting URB

LOG:[xfer](4) JavaxUsbPipeRequest.c.pipe_request[76] Submitted URB

LOG:[xfer](4) JavaxUsbDeviceProxy.c.Java_com_ibm_jusb_os_linux_JavaxUsb_nativeDeviceProxy[78] Completed Request

LOG:[xfer](4) JavaxUsbDeviceProxy.c.Java_com_ibm_jusb_os_linux_JavaxUsb_nativeDeviceProxy[90] Got completed URB

LOG:[xfer](4) JavaxUsbPipeRequest.c.complete_pipe_request[114] Completing URB.

LOG:[xfer](4) JavaxUsbPipeRequest.c.complete_pipe_request[127] Completed URB.

LOG:[xfer](4) JavaxUsbDeviceProxy.c.Java_com_ibm_jusb_os_linux_JavaxUsb_nativeDeviceProxy[94] Finished completed URB

Got device descriptor (length 18) :

0x12 0x01 0x10 0x01 0x00 0x00 0x00 0x08 0xb0 0x04 0x14 0x01 0x00 0x01 0x01 0x02 0x03 0x01