Method: Ws2812::Basic#open

Defined in:
lib/ws2812/basic.rb

#open ⇒ Object

Actually opens (initializes) communication with the LED strand

Raises an exception when the initialization fails.

Failure is usually because you don’t have root permissions which are needed to access /dev/mem and to create special devices.



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# File 'lib/ws2812/basic.rb', line 77

def open
  return nil if @open
  resp = ws2811_init(@leds)
  fail "init failed with code: " + resp.to_s + ", perhaps you need to run as root?" unless resp.zero?
  @open = true
  self
end