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@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@4thharmonic.com
To: pd-list@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@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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