Class: L8::Util

Inherits:
Object
  • Object
show all
Defined in:
lib/l8/util.rb

Constant Summary collapse

HEADER = 
[0xaa, 0x55]

Class Method Summary collapse

Class Method Details

.frame(payload) ⇒ Object 



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# File 'lib/l8/util.rb', line 17

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

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

.pixels_to_two_byte_array(pixels) ⇒ Object 



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# File 'lib/l8/util.rb', line 11

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

.to_two_byte_color(r, g, b) ⇒ Object 



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# File 'lib/l8/util.rb', line 7

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