Re: Help decoding errno: error -1 errno 71

On Sat, 30 Jul 2011, pavan.inferno wrote:

> Hello,
> 
> I am trying to debug a driver for custom hardware. Kindly let me know what
> the particular error no. s mean. error -1  is (IO) but I dont know what
> error no 2 and 71 mean.  I encounter these two errors during the execution
> of my program. 
> 
> For a clearer picture, my output:
> 
> *Init libusb
> Success
> Opening device handle
> Setting configuration
> libusb:error [op_set_configuration] failed, error -1 errno 71

Error 71 is a low-level hardware error.  In this case it probably means 
the device did not respond to the Set-Configuration request.

> Claiming interface
> Success
> libusb:error [submit_bulk_transfer] submiturb failed error -1 errno=2

Error 2 during submission means the endpoint doesn't exist.  Which 
isn't surprising, since the device never got into the configuration you 
wanted.

Alan Stern

Re: Help decoding errno: error -1 errno 71

Thank you folks for responding promptly.

I would like to know the source of your information about these errors, and
like to read more about it. Kindly point me towards appropriate resources. 

The device works fine on Windows with a precompiled exe, so I know for sure
the hardware isnt flawed. 
Thank you once again for your keen insights.  

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Re: Help decoding errno: error -1 errno 71

pavan.inferno wrote:
> I would like to know the source of your information about these errors, and
> like to read more about it. Kindly point me towards appropriate resources.

Alan is a Linux kernel developer who knows the USB stack extremely
well.  You can look up the error codes in the kernel source.  That's the
beauty of Linux.

> The device works fine on Windows with a precompiled exe, so I know for sure
> the hardware isnt flawed. 

Sorry, your conclusion does not follow from your premise.  Both Windows
and Linux accept many devices that do not technically meet the USB
specifications, and which cause failures on other operating systems with
other assumptions.  That's why we do testing on multiple platforms. 
Have you run your device against the USB Command Verifier tests (USBCV)?

Does your device handle a SetConfiguration request without
disconnecting?  Some devices built for Windows do not.  Is your device
based on an off-the-shelf USB processor (e.g., FX2) or is this a custom
FPGA?

--

-- 
Tim Roberts, timr <at> probo.com
Providenza & Boekelheide, Inc.

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Re: Portable event mechanisms in glib, Qt and friends

On 29 July 2011 21:34, Peter Stuge <peter <at> stuge.se> wrote:
> It's the Windows problem with the libusb-1.0 API. It might even be
> worse in the glib setting because of what glib likes. Are fds the
> prefered event mechanism in glib? What else is there?

This is what I'm using in colord:
https://gitorious.org/colord/master/blobs/master/src/cd-usb.c

Richard.

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Re: Portable event mechanisms in glib, Qt and friends

On Thu, Aug 4, 2011 at 4:08 PM, Richard Hughes <hughsient <at> gmail.com> wrote:
> On 29 July 2011 21:34, Peter Stuge <peter <at> stuge.se> wrote:
>> It's the Windows problem with the libusb-1.0 API. It might even be
>> worse in the glib setting because of what glib likes. Are fds the
>> prefered event mechanism in glib? What else is there?
>
> This is what I'm using in colord:
> https://gitorious.org/colord/master/blobs/master/src/cd-usb.c
>

I assume this is not for Windows, right?

++++++++++
http://www.libusb.org/wiki/windows_backend
Known Restrictions
    .....
    Because there is no native poll on Windows, the ability to return
    externally pollable file descriptors on Windows (libusb_pollfd) has
    been disabled.
++++++++++

--

-- 
Xiaofan

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got a problem using async bulk transfers

Hi there,
thanks for all the help i found on your mailing list so far. 
unfortunately i need some more!

synchronous transfers work perfectely. but async doesn't.

my code:

libusb_context *usbContext;
libusb_device_handle *usbDev;
struct libusb_transfer *usb_trans;
const long USB_BUFFER_SIZE=512*4*8;  //16384

main()
{
     status=libusb_init(&usbContext);
     usbDev=libusb_open_device_with_vid_pid((usbContext), VID, PID);
     status=libusb_set_configuration(usbDev, USB_CONFIG);
     status=libusb_claim_interface(usbDev, USB_INTERFACE);
     status=libusb_set_interface_alt_setting(usbDev, USB_INTERFACE, 
USB_ALTSETTING);

#ifndef USB_SYNC

     usb_trans=libusb_alloc_transfer(0);
     libusb_fill_bulk_transfer(usb_trans, usbDev, OUT_EP, buf, 
USB_BUFFERSIZE, BulkOutCallback, NULL, USB_TIMEOUT);
     timeval tv;
     tv.tv_sec=1;

Re: got a problem using async bulk transfers

On Fri, Aug 5, 2011 at 4:40 AM, Michael Dam <michael.dam <at> gmx.at> wrote:
> i am using libusb-1.0.8 on an ubuntu 11.04 64bit machine. i am
> programming in eclipse.
>
> any idea, what to try, what to change, or even how to fix??

Without looking into the details of the codes and logs, just
one suggestion, there are many bugs in libusb-1.0.8
under Linux (and Mac OS X) which is fixed in libusb-stuge.
Probably you want to try it first.
http://git.libusb.org/?p=libusb-stuge.git;a=summary;js=1

--

-- 
Xiaofan

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Re: got a problem using async bulk transfers

Michael Dam wrote:
>> synchronous transfers work perfectely. but async doesn't.

I see at least one thing that looks inconsistent between the two:  that
0x82.  You could try copying and pasting libusb_bulk_transfer()'s source.
It is built on top of async.  Then just modify it a little at a time until
it either breaks or does what you want.

Michael

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Installing LibUSB on Android Device

I'm currently trying to write a USB driver for an Android project and i think
LibUSB would be perfect for it. I'm looking for some pointers on how to
install though, as i've had a few problems. Eg - should it be configured in
the /system folder? - Do i need to add a LibUSB.so to /system/lib? The main
aim is to be able to call methods from a .c file using the Android NDK. If
anyone has managed this and could give me a few tips it would be much
appreciated!

Thanks, Tony.

http://android.git.kernel.org/?p=platform/external/libusb.git;a=summary

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Re: USB mini-summit at LinuxCon Vancouver

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