On Fri, 10 Jan 2003 16:38:31 +0100, Federico wrote:
Hey Federico:
>If I use the java usb project to connect the cell, I have a expeption: the
>device is claimed by a serial driver.
>Well, if I use the rxtx or javacomm to acces to the serial port, I can
>access only the real serial port and the usb "serial" is unknown to the
>serial comm api.
>
>Anywere can help me?
>I must use the java usb api or simply a general comm api for serial port??
You're running into an annoying issue with Linux's
plug-and-play USB driver system, that we run into with the jSyncManager
project (connecting a Palm for synchronization completely in Java).
Linux (kernel 2.4.x series, and some 2.2 with the USB stuff backported)
has a bunch of USB-serial based drivers included with the distro that
will dynamically load themselves and claim the port as soon as you plug
in a USB device they recognise. They claim control before you can
through a more general Java USB API.
The "solution" (which is by no means ideal) is to un-install
the modules that are getting in your way (via rmmod), and then renaming
their module files so the kernel can't load them again.
In our case, unless you prevent the kernel from loading
usbserial.o and visor.o, the jSyncManager can't connect to the Palm
when it's plugged in -- these drivers load, make themselves the sole
device owner, and prevent any direct USB access.
Plug in your cell phone and run lsmod (as root) to see what
modules are loaded. I'm willing to bet that at least usbserial.o is
being loaded, and possibly others that rely upon it. Un-plug your
phone, rmmod the offending modules, rename them, and then try
connecting.
We're still looking for a better solution to this problem for
our project, as many users won't want to disable these modules
completely (as they're used by other devices and applications). In our
case, we'll probably create another connector class with some JNI in it
to connect directly to visor.o specifically for Linux, and use jUSB and
Java USB on all other platforms.
Brad BARCLAY
Lead Developer & Project Administrator,
The jSyncManager Project.
=-=-=-=-=-=-=-=-=
>From the OS/2 WARP v4.5 Desktop of Brad BARCLAY.
E-Mail: [EMAIL PROTECTED] Web: http://www.jsyncmanager.org
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