Contents

require 'digest/crc8'

module L8
  class Util
    HEADER = [0xaa, 0x55]

    def self.to_two_byte_color(r, g, b)
      [(0.to_s(16) + b.to_s(16)).hex] + [(g.to_s(16) + r.to_s(16)).hex]
      end

    def self.pixels_to_two_byte_array(pixels)
      data = []
      pixels.each_slice(3) { |slice| data.concat to_two_byte_color(slice[0], slice[1], slice[2]) }
      data
    end

    def self.frame(payload)
      crc8 = Digest::CRC8.new
      crc8 << payload.pack('C*')

      frame = HEADER + [payload.size] + payload << crc8.checksum
      frame.pack('C*')
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
l8-0.0.3	lib/l8/util.rb
l8-0.0.2	lib/l8/util.rb
l8-0.0.1	lib/l8/util.rb