class SSD1306::Display
Attributes
address[RW]
buffer[RW]
cursor[RW]
height[RW]
interface[RW]
path[RW]
protocol[RW]
vccstate[RW]
width[RW]
Public Class Methods
new(opts = {})
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# File lib/SSD1306/display.rb, line 42 def initialize(opts = {}) default_options = { protocol: :i2c, path: '/dev/i2c-1', address: 0x3C, width: 128, height: 64, reset: 24, vccstate: SSD1306_SWITCHCAPVCC } options = default_options.merge(opts) @protocol = options[:protocol] @path = options[:path] @address = options[:address] @width = options[:width] @height = options[:height] @vccstate = options[:vccstate] @pages = @height / 8 @buffer = [0]*(@width*@pages) @cursor = Cursor.new @reset = options[:reset] if @protocol == :i2c @interface = I2C.create(@path) elsif @protocol == :spi raise 'SPI Not Supported Currently' else raise 'Unrecognized protocol' end # For 128 x 64 display if @height == 64 self.command SSD1306_DISPLAYOFF self.command SSD1306_SETDISPLAYCLOCKDIV self.command 0x80 self.command SSD1306_SETMULTIPLEX self.command 0x3F self.command SSD1306_SETDISPLAYOFFSET self.command 0x0 self.command(SSD1306_SETSTARTLINE | 0x0) self.command SSD1306_CHARGEPUMP if @vccstate == SSD1306_EXTERNALVCC self.command 0x10 else self.command 0x14 end self.command SSD1306_MEMORYMODE self.command 0x00 self.command(SSD1306_SEGREMAP | 0x1) self.command SSD1306_COMSCANDEC self.command SSD1306_SETCOMPINS self.command 0x12 self.command SSD1306_SETCONTRAST if @vccstate == SSD1306_EXTERNALVCC self.command 0x9F else self.command 0xCf end self.command SSD1306_SETPRECHARGE if @vccstate == SSD1306_EXTERNALVCC self.command 0x22 else self.command 0xF1 end self.command SSD1306_SETVCOMDETECT self.command 0x40 self.command SSD1306_DISPLAYALLON_RESUME self.command SSD1306_NORMALDISPLAY end self.command SSD1306_DISPLAYON self.clear! end
Public Instance Methods
clear()
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# File lib/SSD1306/display.rb, line 164 def clear @buffer = [0]*(@width*@pages) @cursor.reset end
clear!()
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# File lib/SSD1306/display.rb, line 169 def clear! self.clear self.display! end
command(c)
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# File lib/SSD1306/display.rb, line 124 def command(c) control = 0x00 @interface.write @address, control, c end
data(d)
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# File lib/SSD1306/display.rb, line 129 def data(d) control = 0x40 @interface.write @address, control, d end
debug_buffer()
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# File lib/SSD1306/display.rb, line 120 def debug_buffer # 1024 entries, not all of them are 0x00 @buffer = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00] end
dim(dim)
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Dim the display
# File lib/SSD1306/display.rb, line 203 def dim(dim) # dim = true: display is dimmed # dim = false: display is normal contrast = 0 # assume dim unless dim if @vccstate == SSD1306_EXTERNALVCC contrast = 0x9F else contrast = 0xCF end end self.command SSD1306_SETCONTRAST self.command contrast end
display!()
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# File lib/SSD1306/display.rb, line 134 def display! self.command SSD1306_COLUMNADDR self.command 0 self.command(@width - 1) self.command SSD1306_PAGEADDR self.command 0 self.command(@pages - 1) # Write buffer data # TODO: This works for I2C only control = 0x40 @interface.write @address, control, @buffer.pack('c*') end
font_size()
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# File lib/SSD1306/display.rb, line 189 def font_size return @cursor.size end
font_size=(new_size)
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# File lib/SSD1306/display.rb, line 193 def font_size=(new_size) @cursor.size = new_size end
image(image)
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# File lib/SSD1306/display.rb, line 147 def image(image) image.image_type = BilevelType pix = image.export_pixels(0, 0, @width, @height, 'I') index = 0 for page in 0...@pages for x in 0...@width bits = 0 for bit in [0, 1, 2, 3, 4, 5, 6, 7] bits = bits << 1 bits |= pix[(page*8*@width) + x + ((7-bit)*@width)] == 0 ? 0 : 1 end @buffer[index] = bits index += 1 end end end
print(string)
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# File lib/SSD1306/display.rb, line 174 def print(string) string.each_byte do |c| self.print_char c end string end
println(string)
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# File lib/SSD1306/display.rb, line 181 def println(string) string.each_byte do |c| self.print_char c end self.print_char 10 # 10 is ASCII for \n string end
reset()
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# File lib/SSD1306/display.rb, line 116 def reset #TODO Reset logic end
set_contrast(contrast)
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TODO: Implement Contrast functionality
# File lib/SSD1306/display.rb, line 198 def set_contrast(contrast) raise 'Contrast not yet implemented' end
Protected Instance Methods
print_char(b)
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This skips to a newline if the byte is a LF newline, otherwise it prints the character, but only if it is in fact a character (i.e., ASCII greater than 31).
# File lib/SSD1306/display.rb, line 224 def print_char(b) if b == 10 @cursor.newline elsif b > 31 for i in 0...5 if @cursor.size == 1 @buffer[@cursor.buffer_index + i] = FONT[(b*5) + i] else byte = FONT[(b*5) + i].to_s(2).rjust(8, '0') a = byte.chars.each_slice(8/@cursor.size).map(&:join) bytes = [] a.each do |e| bytes << e.chars.map {|c| c*(8/e.length)}.join end bytes = bytes.map {|b| b.to_i(2)} bytes.reverse! for page in 0...@cursor.size for x_interval in 0...@cursor.size @buffer[@cursor.buffer_index(page) + i*@cursor.size + x_interval] = bytes[page] end end end end @cursor.increment end end