I2C OLED broken at kernel 5.4.20+


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I am using a orangepi win plus.

I have attached a ssd1306 OLED display to the board, using i2c1 interface, using the luma.oled library as driver.

import sys
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import subprocess
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import ssd1306, ssd1325, ssd1331, sh1106
from time import sleep

serial = i2c(port=1, address=0x3C)
device = ssd1306(serial, rotate=0)

image = Image.new('1', (device.width, device.height))

# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)

# Draw a black filled box to clear the image.
draw.rectangle((0,0,device.width,device.height), outline=0, fill=0)

padding = 2
top = padding
bottom = device.height-padding
# Move left to right keeping track of the current x position for drawing shapes.
x = 0
while True:

    # Draw a black filled box to clear the image.
    draw.rectangle((0,0,width,height), outline=0, fill=0)

    # Shell scripts for system monitoring from here : https://unix.stackexchange.com/questions/119126/command-to-displa$    cmd = "hostname -I | cut -d\' \' -f1"
    IP = subprocess.check_output(cmd, shell = True )
    cmd = "top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"
    CPU = subprocess.check_output(cmd, shell = True )
    cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%sMB %.2f%%\", $3,$2,$3*100/$2 }'"
    MemUsage = subprocess.check_output(cmd, shell = True )
    cmd = "df -h | awk '$NF==\"/\"{printf \"Disk: %d/%dGB %s\", $3,$2,$5}'"
    Disk = subprocess.check_output(cmd, shell = True )

    # Write two lines of text.

    draw.text((x, top),"IP:"+str(IP,encoding = "utf-8"),  font=font, fill=255)
    draw.text((x, top+8),str(CPU,encoding = "utf-8"), font=font, fill=255)
    draw.text((x, top+16),str(MemUsage,encoding = "utf-8"),  font=font, fill=255)
    draw.text((x, top+25),str(Disk,encoding = "utf-8"),  font=font, fill=255)


At the kernel version 5.3.9, the display worked perfectly, without any problem.


But after updating the kernel version to above 5.4.20, the same code don't work at all.

Traceback (most recent call last):
  File "./test_oled.py", line 12, in <module>
    device = ssd1306(serial, rotate=0)
  File "/usr/local/lib/python3.6/dist-packages/luma/oled/device/__init__.py", line 188, in __init__
  File "/usr/local/lib/python3.6/dist-packages/luma/core/mixin.py", line 46, in clear
    self.display(Image.new(self.mode, self.size))
  File "/usr/local/lib/python3.6/dist-packages/luma/oled/device/__init__.py", line 220, in display
  File "/usr/local/lib/python3.6/dist-packages/luma/core/device.py", line 46, in data
  File "/usr/local/lib/python3.6/dist-packages/luma/core/interface/serial.py", line 119, in data
    write(list(data[i:i + block_size]))
  File "/usr/local/lib/python3.6/dist-packages/luma/core/interface/serial.py", line 128, in _write_large_block
    self._bus.i2c_rdwr(self._i2c_msg_write(self._addr, [self._data_mode] + data))
  File "/usr/local/lib/python3.6/dist-packages/smbus2/smbus2.py", line 637, in i2c_rdwr
    ioctl(self.fd, I2C_RDWR, ioctl_data)
TimeoutError: [Errno 110] Connection timed out

Because the luma.oled library just uses the linux kernel i2c interface like the /dev/i2c-1, so it is more likely a bug related to kernel.





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17 hours ago, martinayotte said:

Did you checked the presence of the device with "i2cdetect" ?

Did you checked the permissions of /dev/i2c-1 and running your test script under proper user/group ?

I2cdetect works properly, showing a device at address 0x3c

I'm using superuser permission to execute the script. If there is a permission issue, it will show a error message "permission denied"


Sometimes the display will light up and show proper content, but the script will still run into this error after ~3s.

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On 5/11/2020 at 10:06 PM, martinayotte said:

Then, maybe it is I2C speed issue ...

That is not a I2C speed issue.

I examined the i2c data of the OLED using a logic analyzer and found the i2c clock is both 100KHz (maybe a little slow but reasonable)

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I have a similar problem. i2c detect detects OLED, I was using Codelectron library, but it seems it stopped working. However, I tried to install Luma library, but I am getting some error:

sudo -H pip3 install -e .
Obtaining file:///home/matej/luma.examples
Collecting argcomplete (from luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/b7/9e/9dc74d330c07866d72f62d553fe8bdbe32786ff247a14e68b5659963e6bd/argcomplete-1.12.3-py2.py3-none-any.whl
Collecting luma.core>=1.17.1 (from luma.examples==0.0.0)
  Using cached https://files.pythonhosted.org/packages/e9/c8/878165a9413bcf4745a396809646f16a2eb00eba5589bf5aac1817bf3ce3/luma.core-2.3.1-py2.py3-none-any.whl
Collecting luma.emulator>=1.3.0 (from luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/53/2c/d00bcb9bb02a7a6b36bc984a577181d2ce08709d630cf80739465ef05f43/luma.emulator-1.4.0-py2.py3-none-any.whl
Collecting luma.lcd>=2.5.0 (from luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/4f/a9/b84d13a24e2393ffe989d0fb19c4ba3f8e83abf71fbe487528b7105e2ce7/luma.lcd-2.9.0-py2.py3-none-any.whl
Collecting luma.led_matrix>=1.5.0 (from luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/c9/2d/ffe0f4c610b2740f5ed16dd3d7179cd28d935f1ea851812871ee739da738/luma.led_matrix-1.5.0-py2.py3-none-any.whl
Collecting luma.oled>=3.6.0 (from luma.examples==0.0.0)
  Using cached https://files.pythonhosted.org/packages/d5/3c/2a464be33c7a29633506b75c579cb50356a1e788609db809bf7999c74511/luma.oled-3.8.1-py2.py3-none-any.whl
Collecting importlib-metadata<5,>=0.23; python_version == "3.7" (from argcomplete->luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/8e/e2/49966924c93909d47612bb47d911448140a2f6c1390aec2f4c1afbe3748f/importlib_metadata-4.0.1-py3-none-any.whl
Requirement already satisfied: pillow>=4.0.0 in /usr/lib/python3/dist-packages (from luma.core>=1.17.1->luma.examples==0.0.0) (5.4.1)
Requirement already satisfied: pyftdi in /usr/local/lib/python3.7/dist-packages (from luma.core>=1.17.1->luma.examples==0.0.0) (0.52.9)
Collecting RPI.GPIO; platform_system == "Linux" (from luma.core>=1.17.1->luma.examples==0.0.0)
  Using cached https://files.pythonhosted.org/packages/cb/88/d3817eb11fc77a8d9a63abeab8fe303266b1e3b85e2952238f0da43fed4e/RPi.GPIO-0.7.0.tar.gz
Requirement already satisfied: deprecated in /usr/local/lib/python3.7/dist-packages (from luma.core>=1.17.1->luma.examples==0.0.0) (1.2.12)
Requirement already satisfied: smbus2 in /usr/local/lib/python3.7/dist-packages (from luma.core>=1.17.1->luma.examples==0.0.0) (0.4.1)
Requirement already satisfied: cbor2 in /usr/local/lib/python3.7/dist-packages (from luma.core>=1.17.1->luma.examples==0.0.0) (5.2.0)
Collecting spidev; platform_system == "Linux" (from luma.core>=1.17.1->luma.examples==0.0.0)
  Using cached https://files.pythonhosted.org/packages/62/56/de649e7d95f9fcfaf965a6eb937b4a46bc77ef21487c99cde1a7a0546040/spidev-3.5.tar.gz
Collecting pygame (from luma.emulator>=1.3.0->luma.examples==0.0.0)
  Downloading https://files.pythonhosted.org/packages/c7/b8/06e02c7cca7aec915839927a9aa19f749ac17a3d2bb2610b945d2de0aa96/pygame-2.0.1.tar.gz (5.5MB)
    100% |████████████████████████████████| 5.5MB 47kB/s 
    Complete output from command python setup.py egg_info:
    WARNING, No "Setup" File Exists, Running "buildconfig/config.py"
    Using UNIX configuration...
    /bin/sh: 1: sdl2-config: not found
    /bin/sh: 1: sdl2-config: not found
    /bin/sh: 1: sdl2-config: not found
    /tmp/pip-install-psoj4g37/pygame/setup.py:44: DeprecationWarning: dist() and linux_distribution() functions are deprecated in Python 3.5
      distro = platform.linux_distribution()
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-psoj4g37/pygame/setup.py", line 318, in <module>
      File "/tmp/pip-install-psoj4g37/pygame/buildconfig/config.py", line 221, in main
        deps = CFG.main(**kwds)
      File "/tmp/pip-install-psoj4g37/pygame/buildconfig/config_unix.py", line 194, in main
        DependencyProg('SDL', 'SDL_CONFIG', 'sdl2-config', '2.0', ['sdl']),
      File "/tmp/pip-install-psoj4g37/pygame/buildconfig/config_unix.py", line 39, in __init__
        self.ver = config[0].strip()
    IndexError: list index out of range
    Hunting dependencies...
    For help with compilation see:
    To contribute to pygame development see:
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-psoj4g37/pygame/


Any idea how to solve this?

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