2011/1/30 Benno Meier <meier.be...@googlemail.com>:
> Hi there,
>
> I just started to use PyUSB and want to talk to an AVR.
>
> I ran into a problem with the ctrl_transfer method, here is my listing:
>
> import usb.core
> import usb.util
>
>
> vendorID = 0x16c0
> productID = 0x05dc
> dev = usb.core.find(idVendor=vendorID, idProduct=productID)
>
> if dev is None:
> raise ValueError('Device not found')
> else:
> print('Device found')
>
> dev.set_configuration()
>
> #try to get the Firmware
> bmRequestType = usb.util.CTRL_TYPE_VENDOR |
> usb.util.CTRL_RECIPIENT_DEVICE | usb.util.CTRL_IN
>
> firmware = dev.ctrl_transfer(bmRequestType, 0x00, 0x0e00, 0,
> data_or_wLength = 2, timeout = 500)
>
>> In [61]: firmware
>> Out[61]: array('B', [0])
>
> The code runs fine, but the firmware contains only one byte, although it
> should contain two. Is the code buggy?
>
It doesn't look like your code is buggy. Probably, for some reason,
the fw has only one byte to send, despite the fact you are requesing
2.
>
>
>
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--
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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Finally, a world-class log management solution at an even better price-free!
Download using promo code Free_Logger_4_Dev2Dev. Offer expires
February 28th, so secure your free ArcSight Logger TODAY!
http://p.sf.net/sfu/arcsight-sfd2d
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