Class: Ev3dev::Button

Inherits:
Object
  • Object
show all
Defined in:
lib/ev3dev/button.rb

Constant Summary collapse

KEY_UP =

www.ev3dev.org/docs/tutorials/using-ev3-buttons/ from linux/input.h

103
KEY_DOWN = 
108
KEY_LEFT = 
105
KEY_RIGHT = 
106
KEY_ENTER = 
28
KEY_BACK = 
14
KEY_MAX = 
0x2ff
BUF_LEN =

end of stuff from linux/input.h

(KEY_MAX + 7) / 8
PATH = 
"/dev/input/by-path/platform-gpio-keys.0-event"

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Button

Returns a new instance of Button.



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# File 'lib/ev3dev/button.rb', line 22

def initialize
  raise "couldn't find LED attributes" unless File.exist?(PATH)
  @buttons = {up: KEY_UP, down: KEY_DOWN, left: KEY_LEFT, right: KEY_RIGHT, enter: KEY_ENTER, back: KEY_BACK}
end

Instance Method Details

#back? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 52

def back?
  buf = get_key_buf
  key_pressed?(KEY_BACK, buf)
end

#down? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 32

def down?
  buf = get_key_buf
  key_pressed?(KEY_DOWN, buf)
end

#enter? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 47

def enter?
  buf = get_key_buf
  key_pressed?(KEY_ENTER, buf)
end

#EVIOCGKEY(length) ⇒ Object 



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# File 'lib/ev3dev/button.rb', line 14

def EVIOCGKEY(length)
  2 << (14+8+8) | length << (8+8) | 'E'.ord << 8 | 0x18
end

#left? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 37

def left?
  buf = get_key_buf
  key_pressed?(KEY_LEFT, buf)
end

#pressed ⇒ Object 



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# File 'lib/ev3dev/button.rb', line 57

def pressed
  pressed_buttons =[]
  buf = get_key_buf
  @buttons.each do |button, key_code|
    pressed_buttons << button.to_s if key_pressed?(key_code, buf)
  end
  pressed_buttons
end

#right? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 42

def right?
  buf = get_key_buf
  key_pressed?(KEY_RIGHT, buf)
end

#up? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ev3dev/button.rb', line 27

def up?
  buf = get_key_buf
  key_pressed?(KEY_UP, buf)
end