Re: Asynchronous Transfers Using Android

[Xiaofan C. <xia...@gm...>]

On Sat, Dec 15, 2012 at 12:22 AM, Peter Knee <pa...@sa...> wrote:
> All,
>
> I have ported libusb (version 1.0.9) to Android (4.0).

Maybe you want to tell us a bit more what you have done to port
libusb 1.0.9 to Android 4.0, did you modify anything?

> Android sits on top
> of a Linux kernel.  I have been working on a project that needs to
> asynchronously capture data from a USB device.  The issue I'm running into
> is when I try and cancel the transfers I have submitted.  Specifically, it
> appears as though the transfers are never cancelled, instead just showing a
> "LIBUSB_TRANSFER_COMPLETED" status.  I have begun to go through the code to
> try and understand why the callback function I supplied is never called with
> the "LIBUSB_TRANSFER_CANCELLED" status but I have not had any luck in
> tracking this down.  Has anyone seen something similar?  Or can you point me
> in the right direction to where I need to look to see where this is hanging
> up.

The first thing you may want to try is to use the git version to see if that
helps. Secondly, a debug log will help. You can refer to the following page
on how to do that.
http://libusb.org/wiki/debug

> I should mention that I have successfully installed and ran my project using
> LibUSB on RHEL 6, with the ability to cancel all the transfers that I
> submit.

You can generate the debug log in RHEL 6 and compare with the previous
debug log to see if that helps.


-- 
Xiaofan