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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Sending USB commands with Python
Date: Wed, 29 Aug 2012 17:57:34 -0400
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On Wed, 29 Aug 2012 14:21:30 -0700 (PDT), "Adam W."
<AWasilenko@gmail.com> declaimed the following in
gmane.comp.python.general:

> You are correct about the 2 being the number of bytes written.  However when I issue a read command I get:
> 
> >>> ep.write('\x1BA')
> 4

	That's interesting -- as if each byte you send is expanding into a
pair of bytes.

> >>> ep.read(1)
> Traceback (most recent call last):
>   File "<pyshell#75>", line 1, in <module>
>     ep.read(1)
>   File "C:\Python32\lib\site-packages\usb\core.py", line 301, in read
>     return self.device.read(self.bEndpointAddress, size, self.interface, timeout)
>   File "C:\Python32\lib\site-packages\usb\core.py", line 654, in read
>     self.__get_timeout(timeout)
>   File "C:\Python32\lib\site-packages\usb\backend\libusb01.py", line 483, in bulk_read
>     timeout)
>   File "C:\Python32\lib\site-packages\usb\backend\libusb01.py", line 568, in __read
>     timeout
>   File "C:\Python32\lib\site-packages\usb\backend\libusb01.py", line 384, in _check
>     raise USBError(errmsg, ret)
> usb.core.USBError: [Errno None] b'libusb0-dll:err [_usb_setup_async] invalid endpoint 0x02\n'
> 
> Avoiding the read command all together I should be able to write "<esc> E" and have it feed some paper, which it is not doing, so obviously there is more to uncover.  That said I feel this endeavor has evolved and is no longer pertinent to the Python group so I will let you guys off the hook on this (although responses/suggestions are still welcome).
> 

	Your original code shows you matching to an "OUT" endpoint... Could
you need an "IN" to read the return values?

	Unfortunately it will be a few weeks before Amazon ships "USB
Complete" so most of the setup hassle is currently just noise to me.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/