这里有一个来自github的程序https://github.com/karabek/OrangePi-OLED/blob/master/oled/device.py，它用于向i2c oled设备发送数据。我试图让它在我的系统上运行。我稍微更改了程序，让它在端口 3 上工作并打印发送的数据，这样我就可以检查数据中的错误。 这是编辑后的程序
#!/usr/bin/env python
# The MIT License (MIT)
#
# Copyright (c) 2015 Richard Hull
#
# 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.
# Example usage:
#
# from oled.device import ssd1306, sh1106
# from oled.render import canvas
# from PIL import ImageFont, ImageDraw
#
# font = ImageFont.load_default()
# device = sh1106(port=1, address=0x3C)
#
# with canvas(device) as draw:
# draw.rectangle((0, 0, device.width, device.height), outline=0, fill=0)
# draw.text(30, 40, "Hello World", font=font, fill=255)
#
# As soon as the with-block scope level is complete, the graphics primitives
# will be flushed to the device.
#
# Creating a new canvas is effectively 'carte blanche': If you want to retain
# an existing canvas, then make a reference like:
#
# c = canvas(device)
# for X in ...:
# with c as draw:
# draw.rectangle(...)
#
# As before, as soon as the with block completes, the canvas buffer is flushed
# to the device
import smbus
class device(object):
"""
Base class for OLED driver classes
"""
def __init__(self, port=3, address=0x3C, cmd_mode=0x00, data_mode=0x40):
self.cmd_mode = cmd_mode
self.data_mode = data_mode
self.bus = smbus.SMBus(port)
self.addr = address
def command(self, *cmd):
"""
Sends a command or sequence of commands through to the
device - maximum allowed is 32 bytes in one go.
"""
assert(len(cmd) <= 32)
print(cmd)
self.bus.write_i2c_block_data(self.addr, self.cmd_mode, list(cmd))
def data(self, data):
"""
Sends a data byte or sequence of data bytes through to the
device - maximum allowed in one transaction is 32 bytes, so if
data is larger than this it is sent in chunks.
"""
for i in xrange(0, len(data), 32):
self.bus.write_i2c_block_data(self.addr,
self.data_mode,
list(data[i:i+32]))
class sh1106(device):
"""
A device encapsulates the I2C connection (address/port) to the SH1106
OLED display hardware. The init method pumps commands to the display
to properly initialize it. Further control commands can then be
called to affect the brightness. Direct use of the command() and
data() methods are discouraged.
"""
def __init__(self, port=1, address=0x3C):
super(sh1106, self).__init__(port, address)
self.width = 128
self.height = 64
self.pages = self.height / 8
self.command(
const.DISPLAYOFF,
const.MEMORYMODE,
const.SETHIGHCOLUMN, 0xB0, 0xC8,
const.SETLOWCOLUMN, 0x10, 0x40,
const.SETCONTRAST, 0x7F,
const.SETSEGMENTREMAP,
const.NORMALDISPLAY,
const.SETMULTIPLEX, 0x3F,
const.DISPLAYALLON_RESUME,
const.SETDISPLAYOFFSET, 0x00,
const.SETDISPLAYCLOCKDIV, 0xF0,
const.SETPRECHARGE, 0x22,
const.SETCOMPINS, 0x12,
const.SETVCOMDETECT, 0x20,
const.CHARGEPUMP, 0x14,
const.DISPLAYON)
def display(self, image):
"""
Takes a 1-bit image and dumps it to the SH1106 OLED display.
"""
assert(image.mode == '1')
assert(image.size[0] == self.width)
assert(image.size[1] == self.height)
page = 0xB0
pix = list(image.getdata())
step = self.width * 8
for y in xrange(0, self.pages * step, step):
# move to given page, then reset the column address
self.command(page, 0x02, 0x10)
page += 1
buf = []
for x in xrange(self.width):
byte = 0
for n in xrange(0, step, self.width):
byte |= (pix[x + y + n] & 0x01) << 8
byte >>= 1
buf.append(byte)
self.data(buf)
class ssd1306(device):
"""
A device encapsulates the I2C connection (address/port) to the SSD1306
OLED display hardware. The init method pumps commands to the display
to properly initialize it. Further control commands can then be
called to affect the brightness. Direct use of the command() and
data() methods are discouraged.
"""
def __init__(self, port=1, address=0x3C):
super(ssd1306, self).__init__(port, address)
self.width = 128
self.height = 64
self.pages = self.height / 8
self.command(
const.DISPLAYOFF,
const.SETDISPLAYCLOCKDIV, 0x80,
const.SETMULTIPLEX, 0x3F,
const.SETDISPLAYOFFSET, 0x00,
const.SETSTARTLINE,
const.CHARGEPUMP, 0x14,
const.MEMORYMODE, 0x00,
const.SEGREMAP,
const.COMSCANDEC,
const.SETCOMPINS, 0x12,
const.SETCONTRAST, 0xCF,
const.SETPRECHARGE, 0xF1,
const.SETVCOMDETECT, 0x40,
const.DISPLAYALLON_RESUME,
const.NORMALDISPLAY,
const.DISPLAYON)
def display(self, image):
"""
Takes a 1-bit image and dumps it to the SSD1306 OLED display.
"""
assert(image.mode == '1')
assert(image.size[0] == self.width)
assert(image.size[1] == self.height)
self.command(
const.COLUMNADDR, 0x00, self.width-1, # Column start/end address
const.PAGEADDR, 0x00, self.pages-1) # Page start/end address
pix = list(image.getdata())
step = self.width * 8
buf = []
for y in xrange(0, self.pages * step, step):
i = y + self.width-1
while i >= y:
byte = 0
for n in xrange(0, step, self.width):
byte |= (pix[i + n] & 0x01) << 8
byte >>= 1
buf.append(byte)
i -= 1
self.data(buf)
class const:
CHARGEPUMP = 0x8D
COLUMNADDR = 0x21
COMSCANDEC = 0xC8
COMSCANINC = 0xC0
DISPLAYALLON = 0xA5
DISPLAYALLON_RESUME = 0xA4
DISPLAYOFF = 0xAE
DISPLAYON = 0xAF
EXTERNALVCC = 0x1
INVERTDISPLAY = 0xA7
MEMORYMODE = 0x20
NORMALDISPLAY = 0xA6
PAGEADDR = 0x22
SEGREMAP = 0xA0
SETCOMPINS = 0xDA
SETCONTRAST = 0x81
SETDISPLAYCLOCKDIV = 0xD5
SETDISPLAYOFFSET = 0xD3
SETHIGHCOLUMN = 0x10
SETLOWCOLUMN = 0x00
SETMULTIPLEX = 0xA8
SETPRECHARGE = 0xD9
SETSEGMENTREMAP = 0xA1
SETSTARTLINE = 0x40
SETVCOMDETECT = 0xDB
SWITCHCAPVCC = 0x2
然后它给出一个错误：
(174, 213, 128, 168, 63, 211, 0, 64, 141, 20, 32, 0, 160, 200, 218, 18, 129, 207, 217, 241, 219, 64, 164, 166, 175)
(33, 0, 127, 34, 0, 7.0)
Traceback (most recent call last):
File "/root/OrangePi-OLED/gui.py", line 8, in <module>
with canvas(device) as draw:
File "/root/OrangePi-OLED/oled/render.py", line 74, in __exit__
self.device.display(self.image)
File "/root/OrangePi-OLED/oled/device.py", line 190, in display
self.command(
File "/root/OrangePi-OLED/oled/device.py", line 74, in command
self.bus.write_i2c_block_data(self.addr, self.cmd_mode, list(cmd))
TypeError: Third argument must be a list of at least one, but not more than 32 integers
我不明白这个，数据打印第三个参数是31整数。
(174, 213, 128, 168, 63, 211, 0, 64, 141, 20, 32, 0, 160, 200, 218, 18, 129, 207, 217, 241, 219, 64, 164, 166, 175)
(33, 0, 127, 34, 0, 7.0)
你的
device.command()7.0self.pages = self.height / 8Python 除法返回一个浮点数，而不是一个整数。尝试将结果转换为
intself.pages = int(self.height / 8)数据量没问题，就是数据类型，有个float
使用for循环来int所有数据：
cmd_int = list(cmd)
for i in range(0, len(cmd_int)):
cmd_int[i]=int(cmd_int[i])
i = i+1