My Projects:

• Mozilla Add-ons
  • Checkyesss [abandoned!] 
  • Checkyesss Development Snapshot [abandoned!]
  • FM4OnAir
• Yahoo Widgets
  • Checkyesss Widget
• Voice-Over-IP (VoIP)
  • Yeaphone
  • YlSkypeConnector
• NSLU2 Tools
  • Keyevent
• Miscellaneous
  • HP48/49 BODE Analysis
  • State-Variable-Filter (kxProject)
  • Piano Sheet Music
• Web Design
  • Kadin Film Ferayn 

Contents: © 2006-2008 Thomas Reitmayr
Graphics: Thanks to www.bryanbell.com

NSLU2 Tools: keyevent

Purpose

An example for the tool's output:

Double-clicking with the right button of a mouse:

> src/keyevent 09da 0006
Looking for device PID=09da VID=0006
Found event device #2
RightBtn pressed
RightBtn released
RightBtn pressed repeat
RightBtn released

For my Trust USB Sound Card pressing the MUTE button looks like:

> src/keyevent 145f 0090
Looking for device PID=145f VID=0090
Found event device #2
Mute pressed
Mute released

Ok, that's nice but not so useful without any application interpreting the output. The example below implements a shell script to control the Music Player Daemon (MPD) using just the MUTE button on the USB sound card mentioned above.

#!/bin/sh

MPD_HOST=localhost
MPD_PORT=6600
VID=145f
PID=0090

cmd_repeat="echo -e 'repeat 1\nclose' | nc $MPD_HOST $MPD_PORT > /dev/null"
cmd_playing="echo -e 'status\nclose' | nc $MPD_HOST $MPD_PORT | grep state: | grep -q play"
cmd_next="echo -e 'next\nclose' | nc $MPD_HOST $MPD_PORT > /dev/null"
cmd_stop="echo -e 'stop\nprevious\nclose' | nc $MPD_HOST $MPD_PORT > /dev/null"
cmd_play="echo -e 'play\nclose' | nc $MPD_HOST $MPD_PORT > /dev/null"

eval $cmd_repeat

keyevent $VID $PID 5000 1000 1000 10000 | \
( while :
  do
    read key state rep
    echo $key $state $rep
    if [ "$state" = "pressed" ]
    then
      if [ "$rep" = "double" ]
      then
        if eval $cmd_playing
        then
          echo "stopping"
          eval $cmd_stop
        fi
      else
        # single key press
        if eval $cmd_playing
        then
          echo "next song"
          eval $cmd_next
        else
          echo "starting"
          eval $cmd_play
        fi
      fi
    fi
  done )

Pressing the button once turns the player on ("PLAY") or, if it is already playing, skips to the next song in the playlist ("NEXT"). Pressing the button twice within 1 second stops the player ("STOP").

keyevent 0.3 Source Code
keyevent 0.1 Source Code (outdated)
keyevent 0.1 BitBake Package

The packages are also available on my SlugOS/BE 3.10b feed. Follow these instructions (as root):

1. Log into your NSLU2 and add the DevBase feed:
   # echo "src/gz devbase http://feed.devbase.at/slugos-3.10" > /etc/ipkg/01-devbase-feed.conf
2. Update the package database:
   # ipkg update
3. Install some package:
   # ipkg install some-package