Re: [Libusb-devel] error reading from bulk endpoint 0x82: Invalid or incomplete multibyte or wide character

[Johannes E. <joh...@er...>]

On Sat, May 25, 2002, Florian Baumgartner <bau...@cs...> wrote:
> I am playing around with some USB mp3 device, linux (kernel 2.4.5) and
> the libusb (0.1.5).  So far things were going rather straightforward 
> and I was able to exchange data with the device, query its
> configuration,
> setting parameters and things like that.
> 
> Now a certain request results in the errormessage:
> 
> "error reading from bulk endpoint 0x82: 
> Invalid or incomplete multibyte or wide character"
> 
> Since several preceding  bulk transfers over the same "channel" are
> working fine,  I do not think I made any (obvious) mistake in opening
> the usb device or claiming an interface. The problem seems somewhat 
> be related with that certain request.
> 
> Especially I would be interested to know who generates the second part
> of that error message. Okay, it's a strerror call following the bulk 
> transfer ioctl, but is it a message by the linux system or might this 
> message also be generated by the usb device passing it to the linux 
> usb stack ?
> 
> Since the request I'm sending to the device contains some wide character
> strings, such an error by  the device would  make sense ..

I think it's a coincidence. libusb and the kernel USB code don't care
what the data is, they just pass it blindly to the device.

However, I have no idea how that message got generated. I don't see that
text in any header files.

What distribution are you using? What version of glibc?

JE