[lcd4linux] about GPO and buttons

[Juanmol <ju...@gm...>]

hello, i've the picoLCD, works fine but i need to execute a system 
command by pressing a button, i've try this:

Display picoLCD {
   Driver   'picoLCDGraphic'
   Size     '256x64'
   Contrast  230
   Backlight 1
   Inverted   1
   Icons     1
}

Widget TimerW {
   class 'Timer'
   expression n=LCD::GPI(1);nkey=n
   active 1
   update tack
}

Widget GPO_kup {
  class 'GPO'
  expression linea=nkey==5?exec('/usr/bin/beep')
  update tack
}

Widget Ene {
   class 'Text'
   expression 'Hello'
   width 5
}

Layout Default {
   Row5 {
       Col5 'ene'
   }

   Timer1 'TimerW'

   GPO3       'GPO_kup'
}

Display 'picoLCD'

Layout  'Default'

Variables {
  tick 500
  tack 100
  minute 60000
  n 0
  nkey 0
  linea 1
}


but the 'beep' sounds always, how i can do it?