[PD] HID double triggers

[Andrew Faraday]

my experience is that puredata basically takes the raw signal from your controller. If you can find some method of fixing this in your OS, by all means let me know

Date: Thu, 19 Apr 2012 10:42:06 +0100
From: james at 4thharmonic.com
To: jbturgid at hotmail.com
CC: pd-list at iem.kug.ac.at
Subject: Re: [PD] HID double triggers


  
    
  
  
    If it was spurious noise from a switch that was insufficiently
    debounced, surely I would get more random triggers? For example,
    sometimes one trigger, sometimes two or three? Also, if this is a
    fundamental issue with the hardware, then how does Mac OS X manage
    to handle it correctly? Surely it is an issue with either [hid] or
    linux, and therefore a bug with one or the other?

    

    Thanks for the patch. It is possible to ignore duplicate messages in
    a stream as you suggest however it's complicated somewhat by the
    fact that the messages don't always arrive in the same order!

    

    For example:

    

    [hid] 0.7, written by Hans-Christoph Steiner <hans at eds.org>

          compiled on Apr 15 2012 at 08:12:47 

      [hid] opened device 4 (/dev/input/event4): AT Translated Set 2
      keyboard

    print: key key_j 1

      print: key key_l 1

      print: key key_j 1

      print: key key_l 1

      print: key key_j 0

      print: key key_j 0

      print: key key_l 0

      print: key key_l 0

      

    I can filter these out later on, but it would be nice to have a
    bug free object!

    

    thanks for you help

    

    James

    

    

    Quoth Andrew Faraday, on 18/04/2012 19:27:
    
      
       I've had this problem before with [hid],
        apparently it's a hardware issue called 'debouncing', which is
        often ignored because it is often irrelevant (pushed is pushed,
        for game controllers, rather than a button-on/button-off signal
        used for most music systems). 

        

        You can deal with the problem in pure data by using a trigger,
        float and delay of one millisecond. See the attached patch,
        click the message boxes and watch your terminal for the result.
        

        

        I hope this helps.

        

        Andrew

        

        
          Date: Wed, 18 Apr 2012 16:53:44 +0100

          From: james at 4thharmonic.com

          To: pd-list at iem.kug.ac.at

          Subject: [PD] HID double triggers

          

          Hi list,

          

          recently I've been playing around with [hid] again and still
          have the issue with double triggers on linux (see previous
          post here).

          

          I've downloaded the latest version of Pd-0.43.1-extended-ubuntu-lucid-i386.deb
          but I have the same problem with my existing Arch Linux
          installation on my laptop as well.

          

          It works fine on Mac 10.6. The problem is that I basically get
          two identical events for each key press and release, ie:

          

          [hid] 0.7, written by Hans-Christoph Steiner <hans at eds.org>

                compiled on Apr 15 2012 at 08:12:47 

            [hid] opened device 4 (/dev/input/event4): AT Translated Set
            2 keyboard

            print: key key_u 1

            print: key key_u 1

            print: key key_u 0

            print: key key_u 0

          

          Is anyone else having this problem?

          

          thanks

          

          James

          

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