2011/1/17 Rob Fowler <le...@mianos.com>:
> The the tutorial:
> # get an endpoint instance
> ep = usb.util.find_descriptor(
> dev.get_interface_altsetting(), # first interface
> # match the first OUT endpoint
> custom_match = \
> lambda e: \
> usb.util.endpoint_direction(e.bEndpointAddress) == \
> usb.util.ENDPOINT_OUT
> )
>
>
> is used.
> In the change log and code get_interface_altsetting was removed in the
> last version.
> What's the trick here? Should I just try and use the first?
>
>
This API was removed. You can now use usb.control.get_interface() to
get the interface alternate setting. But notice that it returns the
interface alternate setting number, not the interface object. I must
change the tutorial. What you will get in the end is a cleaner core
API in detriment of a harder to do corner case. The updated version
should be something like this:
# get an endpoint instance
cfg = dev.get_active_configuration()
interface_number = cfg[0].bInterfaceNumber
alternate_settting = usb.control.get_interface(interface_number)
intf = usb.util.find_descriptor(cfg, bInterfaceNumber =
interface_number, bAlternateSetting = alternate_setting)
ep = usb.util.find_descriptor(
intf,
# match the first OUT endpoint
custom_match = \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_OUT
)
Maybe I recreate get_interface_altsetting in the usb.util module for
next release.
--
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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