Re: [Libusb-devel] Problems with sync bulk transfer linux

[Satpal C. <sa...@pi...>]

Hi,

Thanks for that I implement the patch from ticket 56 (had to do it manually,
got errors when importing using mercurial)
All is working now.

Thanks
Satpal
-----Original Message-----
From: Xiaofan Chen [mailto:xia...@gm...] 
Sent: 20 July 2011 04:14
To: Satpal Chander
Cc: lib...@li...
Subject: Re: [Libusb-devel] Problems with sync bulk transfer linux

On Tue, Jul 19, 2011 at 8:43 PM, Satpal Chander <sa...@pi...> wrote:
> Hi All,
>
> I'm currently developing the linux driver for our usb product, using 
> libusb
> 1.0.8 and the usb hardware is a cypress fx2 chip.
>
> I have been developing mostly using a virtual machine(Virtual Box with 
> usb 2 extension pack) and Ubuntu 10.10 32bit on window 7 64 bit host (core
2 duo).
>
> Whilst developing the code I have been able to get libusb to send the 
> data via a Sync bulk transfer, this works absolutely fine on the VM.
>
> However I recently started testing the software on a 'real' linux 
> hardware (core 2 duo) running the same Ubuntu 10.10 32bit OS the sync 
> bulk transfer fails, e.g. libusb never returns from the sync bulk transfer
call.
>
> I couldn't understand why this would be the case on the real hardware.

I am guessing here but you have not provide enough details like the debug
log.

You may be hitting some bugs related to libusb-1.0.8 which may have already
been fixed in libusb-stuge. You may want to give it a try.
http://git.libusb.org/?p=libusb-stuge.git;a=summary;js=1

The following ticket may also apply your case. You might want to try the
patch as well on top of 1.0.8 to see it that helps.
http://www.libusb.org/ticket/56


--
Xiaofan