124 lines
3.9 KiB
Python
Executable File
124 lines
3.9 KiB
Python
Executable File
"""
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The MIT License (MIT)
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Copyright (c) 2015 Richard Hull
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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"""
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import smbus2 as smbus
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from PIL import Image, ImageDraw
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from .I2C_DEVICE import Device
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class SSD1306(Device):
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"""
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A device encapsulates the I2C connection (address/port) to the SSD1306
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OLED display hardware. The init method pumps commands to the display
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to properly initialize it. Further control commands can then be
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called to affect the brightness. Direct use of the command() and
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data() methods are discouraged.
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"""
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def __init__(self, port=1, address=0x3C):
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super(SSD1306, self).__init__(port, address)
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self.width = 128
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self.height = 64
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self.pages = round(self.height / 8)
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self.command(
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const.DISPLAYOFF,
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const.SETDISPLAYCLOCKDIV, 0x80,
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const.SETMULTIPLEX, 0x3F,
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const.SETDISPLAYOFFSET, 0x00,
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const.SETSTARTLINE,
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const.CHARGEPUMP, 0x14,
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const.MEMORYMODE, 0x00,
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const.SEGREMAP,
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const.COMSCANDEC,
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const.SETCOMPINS, 0x12,
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const.SETCONTRAST, 0xCF,
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const.SETPRECHARGE, 0xF1,
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const.SETVCOMDETECT, 0x40,
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const.DISPLAYALLON_RESUME,
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const.NORMALDISPLAY,
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const.DISPLAYON)
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def display(self, image):
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"""
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Takes a 1-bit image and dumps it to the SSD1306 OLED display.
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"""
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assert(image.mode == '1')
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assert(image.size[0] == self.width)
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assert(image.size[1] == self.height)
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self.command(
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const.COLUMNADDR, 0x00, self.width-1, # Column start/end address
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const.PAGEADDR, 0x00, self.pages-1) # Page start/end address
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pix = list(image.getdata())
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step = self.width * 8
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buf = []
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for y in range(0, self.pages * step, step):
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i = y + self.width-1
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while i >= y:
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byte = 0
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for n in range(0, step, self.width):
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byte |= (pix[i + n] & 0x01) << 8
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byte >>= 1
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buf.append(byte)
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i -= 1
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self.data(buf)
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def draw(self):
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self.image = Image.new('1', (self.width, self.height))
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return ImageDraw.Draw(self.image)
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class const:
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CHARGEPUMP = 0x8D
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COLUMNADDR = 0x21
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COMSCANDEC = 0xC8
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COMSCANINC = 0xC0
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DISPLAYALLON = 0xA5
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DISPLAYALLON_RESUME = 0xA4
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DISPLAYOFF = 0xAE
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DISPLAYON = 0xAF
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EXTERNALVCC = 0x1
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INVERTDISPLAY = 0xA7
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MEMORYMODE = 0x20
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NORMALDISPLAY = 0xA6
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PAGEADDR = 0x22
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SEGREMAP = 0xA0
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SETCOMPINS = 0xDA
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SETCONTRAST = 0x81
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SETDISPLAYCLOCKDIV = 0xD5
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SETDISPLAYOFFSET = 0xD3
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SETHIGHCOLUMN = 0x10
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SETLOWCOLUMN = 0x00
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SETMULTIPLEX = 0xA8
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SETPRECHARGE = 0xD9
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SETSEGMENTREMAP = 0xA1
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SETSTARTLINE = 0x40
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SETVCOMDETECT = 0xDB
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SWITCHCAPVCC = 0x2
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