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Groups > comp.lang.python > #28158

Re: Sending USB commands with Python

From Tim Roberts <timr@probo.com>
Newsgroups comp.lang.python
Subject Re: Sending USB commands with Python
Date 2012-08-30 20:55 -0700
Organization Providenza & Boekelheide, Inc.
Message-ID <pcd04892upqu710bjna9sn43ogplq7lgb9@4ax.com> (permalink)
References <ff6f931d-e5ad-40ee-aa4d-f2bbd1303046@googlegroups.com> <d8er38h4ns0obmhevo4v12u0qk2rhufeu8@4ax.com> <09ec368e-9079-46dc-a70a-3ae345d7996c@googlegroups.com> <mailman.3942.1346270988.4697.python-list@python.org> <mailman.3943.1346275293.4697.python-list@python.org>

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"Adam W." <AWasilenko@gmail.com> wrote:
>
>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
>>>> ep.read(1)
>usb.core.USBError: [Errno None] b'libusb0-dll:err [_usb_setup_async] invalid endpoint 0x02\n'

USB endponts only go in one direction.  There will be one endpoint for
outoging data, and one endpoint for incoming data.
-- 
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

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Thread

Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-28 17:04 -0700
  Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-28 22:54 -0400
    Re: Sending USB commands with Python hamilton <hamilton@nothere.com> - 2012-08-28 21:03 -0600
      Re: Sending USB commands with Python alex23 <wuwei23@gmail.com> - 2012-08-28 22:04 -0700
        Re: Sending USB commands with Python hamilton <hamilton@nothere.com> - 2012-08-28 23:18 -0600
  Re: Sending USB commands with Python Tim Roberts <timr@probo.com> - 2012-08-28 23:45 -0700
    Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 16:09 -0400
      Re: Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-29 14:21 -0700
        Re: Sending USB commands with Python Tim Roberts <timr@probo.com> - 2012-08-30 20:55 -0700
      Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 17:57 -0400

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