I made a slight modification on your existing code trying to work with the pure SMBus. I got everything working fine for somehow I still couldn't manage to get my text scrolling from Right to Left
I've looked over the Arduino codes for this SSD1306 trying to see how you guys manage to do it but it wouldn't help much
I assume it's just as simple as sending a command to the register to activate Left/Right scrolling. Please correct me if I'm wrong.
Below is the modified code for my application
# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola
#
# 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 time, smbus
# Constants
SSD1306_I2C_ADDRESS = 0x3C # 011110+SA0+RW - 0x3C or 0x3D
SSD1306_SETCONTRAST = 0x81
SSD1306_DISPLAYALLON_RESUME = 0xA4
SSD1306_DISPLAYALLON = 0xA5
SSD1306_NORMALDISPLAY = 0xA6
SSD1306_INVERTDISPLAY = 0xA7
SSD1306_DISPLAYOFF = 0xAE
SSD1306_DISPLAYON = 0xAF
SSD1306_SETDISPLAYOFFSET = 0xD3
SSD1306_SETCOMPINS = 0xDA
SSD1306_SETVCOMDETECT = 0xDB
SSD1306_SETDISPLAYCLOCKDIV = 0xD5
SSD1306_SETPRECHARGE = 0xD9
SSD1306_SETMULTIPLEX = 0xA8
SSD1306_SETLOWCOLUMN = 0x00
SSD1306_SETHIGHCOLUMN = 0x10
SSD1306_SETSTARTLINE = 0x40
SSD1306_MEMORYMODE = 0x20
SSD1306_COLUMNADDR = 0x21
SSD1306_PAGEADDR = 0x22
SSD1306_COMSCANINC = 0xC0
SSD1306_COMSCANDEC = 0xC8
SSD1306_SEGREMAP = 0xA0
SSD1306_CHARGEPUMP = 0x8D
SSD1306_EXTERNALVCC = 0x1
SSD1306_SWITCHCAPVCC = 0x2
# Scrolling constants
SSD1306_ACTIVATE_SCROLL = 0x2F
SSD1306_DEACTIVATE_SCROLL = 0x2E
SSD1306_SET_VERTICAL_SCROLL_AREA = 0xA3
SSD1306_RIGHT_HORIZONTAL_SCROLL = 0x26
SSD1306_LEFT_HORIZONTAL_SCROLL = 0x27
SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = 0x29
SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL = 0x2A
class SSD1306Base(object):
"""Base class for SSD1306-based OLED displays. Implementors should subclass
and provide an implementation for the _initialize function.
"""
def __init__(self, width, height,address=SSD1306_I2C_ADDRESS):
self._i2c = smbus.SMBus(1)
self.address = address
self.width = width
self.height = height
self._pages = height//8
self._buffer = [0]*(width*self._pages)
# Default to platform GPIO if not provided.
def _initialize(self):
raise NotImplementedError
def command(self, c):
"""Send command byte to display."""
control = 0x00 # Co = 0, DC = 0
self._i2c.write_byte_data(self.address, control, c)
def data(self, c):
# I2C write.
control = 0x40 # Co = 0, DC = 0
self._i2c.write_byte_data(self.address, control, c)
def begin(self, vccstate=SSD1306_SWITCHCAPVCC):
"""Initialize display."""
# Save vcc state.
self._vccstate = vccstate
# Reset and initialize display.
self._initialize()
# Turn on the display.
self.command(SSD1306_DISPLAYON)
def display(self):
"""Write display buffer to physical display."""
self.command(SSD1306_COLUMNADDR)
self.command(0) # Column start address. (0 = reset)
self.command(self.width-1) # Column end address.
self.command(SSD1306_PAGEADDR)
self.command(0) # Page start address. (0 = reset)
self.command(self._pages-1) # Page end address.
# Write buffer data.
for i in range(0, len(self._buffer), 16):
control = 0x40 # Co = 0, DC = 0
self._i2c.write_i2c_block_data(self.address, control, self._buffer[i:i+16])
def image(self, image):
"""Set buffer to value of Python Imaging Library image. The image should
be in 1 bit mode and a size equal to the display size.
"""
if image.mode != '1':
raise ValueError('Image must be in mode 1.')
imwidth, imheight = image.size
if imwidth != self.width or imheight != self.height:
raise ValueError('Image must be same dimensions as display ({0}x{1}).' \
.format(self.width, self.height))
# Grab all the pixels from the image, faster than getpixel.
pix = image.load()
# Iterate through the memory pages
index = 0
for page in range(self._pages):
# Iterate through all x axis columns.
for x in range(self.width):
# Set the bits for the column of pixels at the current position.
bits = 0
# Don't use range here as it's a bit slow
for bit in [0, 1, 2, 3, 4, 5, 6, 7]:
bits = bits << 1
bits |= 0 if pix[(x, page*8+7-bit)] == 0 else 1
# Update buffer byte and increment to next byte.
self._buffer[index] = bits
index += 1
def clear(self):
"""Clear contents of image buffer."""
self._buffer = [0]*(self.width*self._pages)
def set_contrast(self, contrast):
"""Sets the contrast of the display. Contrast should be a value between
0 and 255."""
if contrast < 0 or contrast > 255:
raise ValueError('Contrast must be a value from 0 to 255 (inclusive).')
self.command(SSD1306_SETCONTRAST)
self.command(contrast)
def dim(self, dim):
"""Adjusts contrast to dim the display if dim is True, otherwise sets the
contrast to normal brightness if dim is False.
"""
# Assume dim display.
contrast = 0
# Adjust contrast based on VCC if not dimming.
if not dim:
if self._vccstate == SSD1306_EXTERNALVCC:
contrast = 0x9F
else:
contrast = 0xCF
#~ def horScroll(self, direction):
#~ try:
#~ if direction.lower() == 'left':
#~ self.command(SSD1306_LEFT_HORIZONTAL_SCROLL)
#~ elif direction.lower()=='right':
#~ self.command(SSD1306_RIGHT_HORIZONTAL_SCROLL)
#~ except:
#~ pass
def scrollHorLeft(self):
self.command(SSD1306_ACTIVATE_SCROLL)
self.command(SSD1306_LEFT_HORIZONTAL_SCROLL)
#~ self._i2c.write_i2c_block_data(self.address, SSD1306_LEFT_HORIZONTAL_SCROLL, self._buffer[i:i+16])
def scrollHorRight(self):
self.command(SSD1306_ACTIVATE_SCROLL)
self.command(SSD1306_RIGHT_HORIZONTAL_SCROLL)
class SSD1306(SSD1306Base):
def __init__(self, i2c_address=SSD1306_I2C_ADDRESS):
# Call base class constructor.
super(SSD1306, self).__init__(128, 64, i2c_address)
def _initialize(self):
# 128x64 pixel specific initialization.
self.command(SSD1306_DISPLAYOFF) # 0xAE
self.command(SSD1306_SETDISPLAYCLOCKDIV) # 0xD5
self.command(0x80) # the suggested ratio 0x80
self.command(SSD1306_SETMULTIPLEX) # 0xA8
self.command(0x3F)
self.command(SSD1306_SETDISPLAYOFFSET) # 0xD3
self.command(0x0) # no offset
self.command(SSD1306_SETSTARTLINE | 0x0) # line #0
self.command(SSD1306_CHARGEPUMP) # 0x8D
if self._vccstate == SSD1306_EXTERNALVCC:
self.command(0x10)
else:
self.command(0x14)
self.command(SSD1306_MEMORYMODE) # 0x20
self.command(0x00) # 0x0 act like ks0108
self.command(SSD1306_SEGREMAP | 0x1)
self.command(SSD1306_COMSCANDEC)
self.command(SSD1306_SETCOMPINS) # 0xDA
self.command(0x12)
self.command(SSD1306_SETCONTRAST) # 0x81
if self._vccstate == SSD1306_EXTERNALVCC:
self.command(0x9F)
else:
self.command(0xCF)
self.command(SSD1306_SETPRECHARGE) # 0xd9
if self._vccstate == SSD1306_EXTERNALVCC:
self.command(0x22)
else:
self.command(0xF1)
self.command(SSD1306_SETVCOMDETECT) # 0xDB
self.command(0x40)
self.command(SSD1306_DISPLAYALLON_RESUME) # 0xA4
self.command(SSD1306_NORMALDISPLAY) # 0xA6
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