On Tue, Oct 30, 2012 at 1:48 PM, Stefano Di Martino wrote:
>
>> Can you please post a USB log of the transfer so we can see what the
>> device is sending when the string descriptor is requested? Without
>> having the device it may be tricky for someone else to reproduce the
>> issue.
>
> Sure, I attached the log.
> FYI: I was always testing with the function
> "libusb_get_string_descriptor_ascii()" from libusbx which works fine now. But
> as I can see, pyUSB uses ctrl_transfer() with the appriate request.
>
One thing about your python example is that you ask for 254 *characters* in
string = usb.util.get_string(self.device, 254,
self.device.iManufacturer)
The actual string length can not be higher than 126 characters. The
descriptor length (in bytes, including the "descriptor length" byte
and the "descriptor type" byte) can be up to 255 bytes, and the string
is encoded in utf-16-le.
I wouldn't expect this to blow things up, but please try with a
smaller character length.
Do you have a USB sniffer trace as well? I would like to see what the
device is actually returning.
Tormod
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