Re: [Libusb-devel] Asynchronous libusb_submit_transfer Error

[TJ <tho...@gm...>]

I changed the  libusb_alloc_transfer() to allocate more memory and still
have same problem.
====>   transfer_response_in  = libusb_alloc_transfer(20);  //Allocation is
done with the libusb_alloc_transfer()

Looking over the documentation I need to...

We can view asynchronous I/O as a 5 step process:

   1. *Allocation*: allocate a
libusb_transfer<http://libusb.sourceforge.net/api-1.0/structlibusb__transfer.html>
   2. *Filling*: populate the
libusb_transfer<http://libusb.sourceforge.net/api-1.0/structlibusb__transfer.html>instance
with information about the transfer you wish to perform
   3. *Submission*: ask libusb to submit the transfer
   4. *Completion handling*: examine transfer results in the
libusb_transfer<http://libusb.sourceforge.net/api-1.0/structlibusb__transfer.html>structure
   5. *Deallocation*: clean up resources

Any insight?




On Wed, Feb 16, 2011 at 9:59 PM, Thomas J Cramer <tho...@gm...>wrote:

> I'm sorry about the formatting, let me try again.
>
>
> *AsynchEx.c => *http://www.filefactory.com/file/b5706ac/n/AsynchEx.c
>
> PIC's firmware is from Microchips's "LibUSB Simple Demo - Firmware" and the
> main files are =>
>
> *usb_descriptors.c => *
> http://www.filefactory.com/file/b5706ad/n/usb_descriptors.c **
>
> *usb_device.c  => *http://www.filefactory.com/file/b5706af/n/usb_device.c
>
> *main.c  => *http://www.filefactory.com/file/b5706ag/n/main.c
>
> *usb_function_generic.c  => *
> http://www.filefactory.com/file/b5706ah/n/usb_function_generic.c
>
> *usb.h  => *http://www.filefactory.com/file/b5706b0/n/usb.h **
>
>
> I get error -1 from libusb_submit_transfer() shown below...
> -------Start output--
> # gcc AsynchEx.c -L/lib/libusb-1.0.so.0 -lusb-1.0 -lm
> # ./a.out
> device found
> ret_value from libusb_open=0
> Claimed interface
> return value from libusb_submit_transfer(for transfer_response_in)= -1
> return value from libusb_submit_transfer(for transfer_command_out)=-1
> Entering loop to process callbacks...
> do_exit=0,  shutting down...
> at out_deinit
> End
> -------End output---
>
>
>
> On Wed, Feb 16, 2011 at 6:49 PM, Thomas J Cramer <tho...@gm...>wrote:
>
>> I'm trying to make asynchronous calls based off  "AsynchEx.c" from =>
>> http://libusb.6.n5.nabble.com/porting-from-0-1-to-0-93-example-code-td5589.html
>>
>>
>> *AsynchEx.c => *http://www.filefactory.com/file/b5706ac/n/*AsynchEx.c *
>>
>> PIC's firmware is from Microchips's "LibUSB Simple Demo - Firmware" and
>> the main files are =>
>>
>> *usb_descriptors.c => *http://www.filefactory.com/file/b5706ad/n/*
>> usb_descriptors.c *
>>
>> *usb_device.c  => *http://www.filefactory.com/file/b5706af/n/*usb_device.c
>> *
>>
>> *main.c  => *http://www.filefactory.com/file/b5706ag/n/*main.c *
>>
>> *usb_function_generic.c  => *http://www.filefactory.com/file/b5706ah/n/*usb_function_generic.c
>> *
>>
>> *usb.h  => *http://www.filefactory.com/file/b5706b0/n/*usb.h *
>>
>>
>> I get error -1 from libusb_submit_transfer() shown below...
>> -------------------------------------------Start
>> output---------------------------------------------
>> # gcc AsynchEx.c -L/lib/libusb-1.0.so.0 -lusb-1.0 -lm
>> # ./a.out
>> device found
>> ret_value from libusb_open=0
>> Claimed interface
>> return value from *libusb_submit_transfer(for transfer_response_in)= -1*
>> return value from *libusb_submit_transfer(for transfer_command_out)=-1*
>> Entering loop to process callbacks...
>> do_exit=0,  shutting down...
>> at out_deinit
>> End
>> -------------------------------------------End
>> output---------------------------------------------
>>
>>
>> From reading other posts I think it might be an endpoint address error but
>> I need to read a lot more and hopefully posting here would be more helpful.
>>
>>
>> Any insight would be great, I looked thorough  the API for the error code
>> and no luck :)
>>
>> Thanks.
>>
>
>