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ssd1106.py
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ssd1106.py
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# The MIT License (MIT)
#
# Copyright (c) 2014 Kenneth Henderick
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import pyb
# Constants
DISPLAYOFF = 0xAE
SETCONTRAST = 0x81
DISPLAYALLON_RESUME = 0xA4
DISPLAYALLON = 0xA5
NORMALDISPLAY = 0xA6
INVERTDISPLAY = 0xA7
DISPLAYON = 0xAF
SETDISPLAYOFFSET = 0xD3
SETCOMPINS = 0xDA
SETVCOMDETECT = 0xDB
SETDISPLAYCLOCKDIV = 0xD5
SETPRECHARGE = 0xD9
SETMULTIPLEX = 0xA8
SETLOWCOLUMN = 0x00
SETHIGHCOLUMN = 0x10
SETSTARTLINE = 0x40
MEMORYMODE = 0x20
COLUMNADDR = 0x21
PAGEADDR = 0x22
COMSCANINC = 0xC0
COMSCANDEC = 0xC8
SEGREMAP = 0xA0
CHARGEPUMP = 0x8D
EXTERNALVCC = 0x10
SWITCHCAPVCC = 0x20
SETPAGEADDR = 0xB0
SETCOLADDR_LOW = 0x00
SETCOLADDR_HIGH = 0x10
ACTIVATE_SCROLL = 0x2F
DEACTIVATE_SCROLL = 0x2E
SET_VERTICAL_SCROLL_AREA = 0xA3
RIGHT_HORIZONTAL_SCROLL = 0x26
LEFT_HORIZONTAL_SCROLL = 0x27
VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = 0x29
VERTICAL_AND_LEFT_HORIZONTAL_SCROLL = 0x2A
SETSEGMENTREMAP = 0xA1
# I2C devices are accessed through a Device ID. This is a 7-bit
# value but is sometimes expressed left-shifted by 1 as an 8-bit value.
# A pin on SSD1106 allows it to respond to ID 0x3C or 0x3D. The board
# I bought from ebay used a 0-ohm resistor to select between "0x78"
# (0x3c << 1) or "0x7a" (0x3d << 1). The default was set to "0x78"
DEVID = 0x3c
# I2C communication here is either <DEVID> <CTL_CMD> <command byte>
# or <DEVID> <CTL_DAT> <display buffer bytes> <> <> <> <>...
# These two values encode the Co (Continuation) bit as b7 and the
# D/C# (Data/Command Selection) bit as b6.
CTL_CMD = 0x00
CTL_DAT = 0x40
class SSD1106(object):
def __init__(self, pinout, height=32, external_vcc=True, i2c_devid=DEVID):
self.external_vcc = external_vcc
self.height = 32 if height == 32 else 64
self.pages = int(self.height / 8)
self.columns = 128
# Infer interface type from entries in pinout{}
if 'dc' in pinout:
# SPI
rate = 1 * 1024 * 1024
self.spi = pyb.SPI(2, pyb.SPI.MASTER, baudrate=rate, polarity=1, phase=0) # SCK: Y6: MOSI: Y8
self.dc = pyb.Pin(pinout['dc'], pyb.Pin.OUT_PP, pyb.Pin.PULL_DOWN)
self.cs = pyb.Pin(pinout['cs'], pyb.Pin.OUT_PP, pyb.Pin.PULL_DOWN)
self.offset = 0
self.cs.high()
pyb.delay(100)
self.cs.low()
else:
# Infer bus number from pin
if pinout['sda'] == 'X9':
self.i2c = pyb.I2C(1)
else:
self.i2c = pyb.I2C(2)
self.i2c.init(pyb.I2C.MASTER, baudrate=400000) # 400kHz
self.devid = i2c_devid
# used to reserve an extra byte in the image buffer AND as a way to
# infer the interface type
self.offset = 1
# I2C command buffer
self.cbuffer = bytearray(2)
self.cbuffer[0] = CTL_CMD
def clear(self):
self.buffer = bytearray(self.pages * self.columns)
# if self.offset == 1:
# self.buffer[0] = CTL_DAT
def write_command(self, command_byte):
if self.offset == 1:
self.cbuffer[1] = command_byte
self.i2c.send(self.cbuffer, addr=self.devid, timeout=5000)
else:
self.dc.low()
self.spi.send(command_byte)
def invert_display(self, invert):
self.write_command(INVERTDISPLAY if invert else NORMALDISPLAY)
def display(self):
if self.offset == 1:
index = 0
prefix_buffer = bytearray(1)
prefix_buffer[0] = CTL_DAT
for page in range(0, 8):
self.write_command(0xB0 + page)
self.write_command(0x02)
self.write_command(0x10)
for line in range(0, 8):
self.i2c.send(prefix_buffer + self.buffer[index:index + 16], addr=self.devid, timeout=5000)
index += 16
else:
self.dc.high()
self.spi.send(self.buffer)
def set_pixel(self, x, y, state):
index = x + (int(y / 8) * self.columns)
if state:
self.buffer[index] |= (1 << (y & 7))
else:
self.buffer[index] &= ~(1 << (y & 7))
def init_display(self):
chargepump = 0x10 if self.external_vcc else 0x14
precharge = 0x22 if self.external_vcc else 0xf1
multiplex = 0x1f if self.height == 32 else 0x3f
compins = 0x02 if self.height == 32 else 0x12
contrast = 0xcf # 0x8f if self.height == 32 else (0x9f if self.external_vcc else 0x9f)
data = [DISPLAYOFF,
MEMORYMODE,
SETHIGHCOLUMN, 0xB0, 0xC8,
SETLOWCOLUMN, 0x10, 0x40,
SETCONTRAST, 0x7F,
SETSEGMENTREMAP,
NORMALDISPLAY,
SETMULTIPLEX, 0x3F,
DISPLAYALLON_RESUME,
SETDISPLAYOFFSET, 0x00,
SETDISPLAYCLOCKDIV, 0xF0,
SETPRECHARGE, 0x22,
SETCOMPINS, 0x12,
SETVCOMDETECT, 0x20,
CHARGEPUMP, 0x14,
DISPLAYON]
for item in data:
self.write_command(item)
self.clear()
self.display()
def poweron(self):
if self.offset == 1:
pyb.delay(10)
else:
self.cs.high()
pyb.delay(10)
self.cs.low()
pyb.delay(10)
def poweroff(self):
self.write_command(DISPLAYOFF)
def contrast(self, contrast):
self.write_command(SETCONTRAST)
self.write_command(contrast)