2011/1/3 Emmanuel Blot <eblot...@gmail.com>:
>> Maybe you could post the whole code in pastebin, and in the email body
>> the code snippet..
>
> Here it is:
>
> http://pastebin.com/0S1Ce9zt
>
> I've removed everything from the original code to demonstrate the
> "issue" (which may be a wrong usage of pyusb at first ;-)), so do not
> expect the code to do anything but trigger the exception.
>
> The target USB device is a FTDI chip (USB-serial converter)
>
> Cheers,
> Manu
>
I guess I found the problem.
DEV_OUT_REQTYPE = (usb.util.CTRL_TYPE_VENDOR << 5) | \
usb.util.CTRL_RECIPIENT_DEVICE | \
usb.util.CTRL_OUT
>From version a0 to a1 I changed these constants to be combined only
with or's, without shifting, as libusb does. So, starting from a1
version, the correct way to build the bmRequestType filed is:
DEV_OUT_REQTYPE = (usb.util.CTRL_TYPE_VENDOR) | \
usb.util.CTRL_RECIPIENT_DEVICE | \
usb.util.CTRL_OUT
And the *real* correct way to do it (independent of version) is:
DEV_OUT_REQTYPE = usb.util.build_request_type(
usb.util.CTRL_OUT,
usb.util.CTRL_TYPE_VENDOR,
usb.util.CTRL_RECIPIENT_DEVICE
)
Hope this will work... ;)
--
Best Regards,
Wander Lairson Costa
LCoN - Laboratório de Computação Natural - Natural Computing Laboratory
(http://www.mackenzie.com.br/lcon.html)
Programa de Pós-Graduação em Engenharia Elétrica (PPGEE)
Faculdade de Computação e Informática (FCI)
Universidade Presbiteriana Mackenzie - SP - Brazil
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