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Re: Sending USB commands with Python

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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 Thu, 30 Aug 2012 00:55:03 -0400
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On Wed, 29 Aug 2012 20:53:48 -0700 (PDT), "Adam W."
<AWasilenko@gmail.com> declaimed the following in
gmane.comp.python.general:

> Your notation does work, and I was just coming around to reevaluating the use of the encode because I am getting really odd results when trying to print lines.
> 
> For example I set the byte length to 10 and sent this 500 times or so expecting to get a solid black bar:
> ep.write('\x16FFFFFFFFFF'.encode('utf-8'))

	How many bytes did it claim to send?
> 
> But what I got was a weird stripped pattern...  I feel like a lot of my commands are working by chance, I can't explain to myself why the A in \x1bA isn't being treated as part of the hex.  This stuff always confuses me.
>
	That's the easy one -- \x in a string introduces an 8-bit byte value
-- so only two hex digits well be read. The "A" is interpreted as
regular text.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 18:56 -0400
  Re: Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-29 16:45 -0700
  Re: Sending USB commands with Python MRAB <python@mrabarnett.plus.com> - 2012-08-30 01:53 +0100
  Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-29 22:07 -0400
    Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-30 00:55 -0400
      Re: Sending USB commands with Python "Adam W." <AWasilenko@gmail.com> - 2012-08-30 05:51 -0700
        Re: Sending USB commands with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-30 14:24 -0400
        Re: Sending USB commands with Python Cameron Simpson <cs@zip.com.au> - 2012-08-31 08:47 +1000

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