Class: PaPiRus::Display

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

Overview

The Display can be use to send image data to the epd fuse driver

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(epd_path: '/dev/epd', width: 200, height: 96, panel: 'EPD 2.0', cog: 2, film: 231, auto: false, inverse: false, rotation: 0) ⇒ Display

Returns a new instance of Display.



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# File 'lib/papirus.rb', line 15

def initialize(epd_path: '/dev/epd', width: 200, height: 96, panel: 'EPD 2.0', cog: 2, film: 231, auto: false, inverse: false, rotation: 0)
    if epd_path != '/dev/epd'
        # assuming we use a test dir and it is not created yet
        require 'fileutils'
        raise 'epd test path should be located somewhere in /tmp/' unless epd_path =~ /\/tmp\/\w+/
        if File.exists?(epd_path)
            #remove old test dir as it may be a different screen size/type
            FileUtils.rm_f(epd_path)
        end
        FileUtils.mkdir_p(File.join([epd_path, 'LE']))
        %w{command LE/display, LE/display_inverse}.each do |file|
            FileUtils.touch File.join([epd_path, file])
        end
        File.open(File.join([epd_path, 'panel']), 'w+') do |file|
            file.write %{#{panel} #{width}x#{height} COG #{cog} FILM #{film}\n}
        end
    end
    #transver all vars to attr's
    method(__method__).parameters.each do |type, k|
        next unless type == :key
        v = eval(k.to_s)
        instance_variable_set("@#{k}", v) unless v.nil?
    end
    @allowed_commands = ['F', 'P', 'U', 'C']
    get_display_info_from_edp
end

Instance Attribute Details

#allowed_commands ⇒ Object (readonly)

The possible commands to send to the display with command can be eitheri ‘U’ for update ‘F’ for fast update ‘P’ for partial update or ‘C’ for clearing the screen



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# File 'lib/papirus.rb', line 13

def allowed_commands
  @allowed_commands
end

#auto ⇒ Object (readonly)

Returns the value of attribute auto.



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# File 'lib/papirus.rb', line 5

def auto
  @auto
end

#cog ⇒ Object (readonly)

Returns the value of attribute cog.



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# File 'lib/papirus.rb', line 5

def cog
  @cog
end

#display_path ⇒ Object (readonly)

Returns the value of attribute display_path.



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# File 'lib/papirus.rb', line 5

def display_path
  @display_path
end

#epd_path ⇒ Object (readonly)

Returns the value of attribute epd_path.



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# File 'lib/papirus.rb', line 5

def epd_path
  @epd_path
end

#film ⇒ Object (readonly)

Returns the value of attribute film.



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# File 'lib/papirus.rb', line 5

def film
  @film
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/papirus.rb', line 5

def height
  @height
end

#image ⇒ Object

Returns the value of attribute image.



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# File 'lib/papirus.rb', line 6

def image
  @image
end

#inverse ⇒ Object

Returns the value of attribute inverse.



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# File 'lib/papirus.rb', line 6

def inverse
  @inverse
end

#panel ⇒ Object (readonly)

Returns the value of attribute panel.



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# File 'lib/papirus.rb', line 5

def panel
  @panel
end

#rotation ⇒ Object

Returns the value of attribute rotation.



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# File 'lib/papirus.rb', line 6

def rotation
  @rotation
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/papirus.rb', line 5

def width
  @width
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/papirus.rb', line 64

def clear()
    command('C')
end

#command(c) ⇒ Object

send’s the display command to the driver

Parameters:

  • c (string) —

    command to execute, have a look at {}



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# File 'lib/papirus.rb', line 70

def command(c)
    raise "command #{c} does not exist" unless @allowed_commands.include?(c)
    File.open(File.join(@epd_path, "command"), "wb") do |io|
        io.write(c)
    end
end

#fast_update ⇒ Object 



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# File 'lib/papirus.rb', line 52

def fast_update()
    command('F')
end

#partial_update ⇒ Object 



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# File 'lib/papirus.rb', line 56

def partial_update()
    command('P')
end

#show(*args) ⇒ Object 



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# File 'lib/papirus.rb', line 42

def show(*args)
    raise 'you need to at least provide raw imagedata' if args.length == 0
    data = args[0]
    updatemethod = args[1] || 'U'
    File.open(File.join(@epd_path, "LE", "display#{@inverse ? '_inverse': ''}"), 'wb') do |io|
        io.write data
    end
    command(@allowed_commands.include?(updatemethod) ? updatemethod : 'U')
end

#update ⇒ Object 



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# File 'lib/papirus.rb', line 60

def update()
    command('U')
end