On Wed, 19 Oct 2005, Presanna Raman wrote:
>Hi Dan, Thank you for you reply. My understanding is that JSR-80 requires
>all 3 parts to work with - javax-usb API, a Common OS-independent
>Reference Implementation and an OS-dependent Reference Implementation
>(Which basically connects the API to the OS USB stack). Therefore, if
>instead of a OS-dependant RI, using a mobile dependant RI, if provided by
>the manufacturer should in theory make available USB access in the
>mobile. Is this thinking right or am I missing something else here?
It depends on the device. If you have a standard USB Host Controller in
your device and of course a full USB subsystem, then you could implement a
OS-dependent layer to put javax.usb on the device.
>I do require both device side and PC side USB access. I have a situation
>that is similar to the On-The-Go specification available with USB 2.0,
>where the mobile device can also initiate communication with the PC.
>Just for my information, when is the windows implementation of JSR-80
>going to be completed, if at all it is being worked on?
I'm not working on it, so I don't know. sorry. There is an "alpha" level
implementation of javax.usb using libusb, see the mailing list archive for
info. (libusb is implemented on Windows)
>Also, are the
>API's usb version (1.0 or 2.0) specific?
Yes, the current javax.usb API is specific to the USB 1.1 spec. However
device drivers, in almost all cases, don't need to know any USB 2.0
specific information, so it shouldn't make any difference. Unless someone
wanted to write a hub driver implementation on javax.usb (not a good
idea).
>Why is there a necessary for an
>OS-dependent Reference Implementation? Is it b'cos the Stacks are
>implemented different or something else?
Access to USB from userspace is different on each OS, if even provided at
all (e.g. it isn't on Windows, a kernel driver had/has to be written).
--
Dan Streetman
[EMAIL PROTECTED]
---------------------
186,272 miles per second:
It isn't just a good idea, it's the law!
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