Sure, I'll make this tomorrow.

Stefano

On 31.10.2012 20:55, Tormod Volden wrote:
> On Tue, Oct 30, 2012 at 3:20 PM, Tormod Volden wrote:
>> On Tue, Oct 30, 2012 at 3:06 PM, Stefano Di Martino wrote:
>>> Well it did blow things up. Sorry for bothering you guys. :-(
>>> But thanks for your help!!
>> OK, but it should not blow up because of this. IMO pyusb should either
>> guard against this, or give a warning or a better error message. Can
>> you please tell what the device returns when you ask it for the 510
>> bytes descriptor?
> Before you go on to USB sniffing, maybe it will be enough to see what
> libusb and libusbx are returning, to determine if there is a bug in
> pyusb or libusbx. Can you please apply the below patch to pyusb and
> run your test both with libusb and libusbx?
>
> Tormod
>
>
> diff --git a/usb/backend/libusb1.py b/usb/backend/libusb1.py
> index 8bf9515..bedb258 100644
> --- a/usb/backend/libusb1.py
> +++ b/usb/backend/libusb1.py
> @@ -598,6 +598,8 @@ class _LibUSB(usb.backend.IBackend):
>           if usb.util.ctrl_direction(bmRequestType) == usb.util.CTRL_OUT:
>               return ret.value
>           else:
> +            if (bRequest == 0x06) and ((wValue >> 8) == 0x03) and
> ((wValue & 0xff) != 0):
> +                print "DEBUG:", data_or_wLength, length, ret.value, buff
>               return buff[:ret.value]
>
>       @methodtrace(_logger)
>
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