Class: Denko::LED::WS2812

Inherits:
Object
  • Object
show all
Includes:
Behaviors::SinglePin
Defined in:
lib/denko/led/ws2812.rb

Instance Attribute Summary collapse

Attributes included from Behaviors::SinglePin

#mode, #pin

Attributes included from Behaviors::Component

#board

Instance Method Summary collapse

Methods included from Behaviors::Component

#initialize, #micro_delay

Methods included from Behaviors::State

#initialize, #state

Instance Attribute Details

#bpp ⇒ Object (readonly)

Returns the value of attribute bpp.



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# File 'lib/denko/led/ws2812.rb', line 6

def bpp
  @bpp
end

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/denko/led/ws2812.rb', line 6

def length
  @length
end

Instance Method Details

#[]=(index, array) ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 18

def []=(index, array)
  # Just do GRB order for now.
  buffer[index*bpp]   = array[1]
  buffer[index*bpp+1] = array[0]
  buffer[index*bpp+2] = array[2]
end

#after_initialize(options = {}) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/denko/led/ws2812.rb', line 8

def after_initialize(options={})
  super(options)
  raise ArgumentError, "no length given for WS2812 array" unless options[:length]
  @length = options[:length]

  # This is BYTES per pixel, not bits per pixel.
  @bpp = 3
  off
end

#all_on ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 29

def all_on
  buffer.map! { 255 } # should scale with brightness
  show
end

#buffer ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 25

def buffer
  @buffer ||= Array.new(length * bpp) { 0 }
end

#clear ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 39

def clear
  buffer.map! { 0 }
end

#off ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 34

def off
  clear
  show
end

#show ⇒ Object 



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# File 'lib/denko/led/ws2812.rb', line 43

def show
  board.show_ws2812(self.pin, self.buffer)
end