29. September 2021

Eclipse error AutoRegisterSchemeHandlersJob AppData\Local\Temp\jna Can’t find dependent libraries

Windows users might experience a very strange errors when starting Eclipse:

An internal error occurred during: "AutoRegisterSchemeHandlersJob".
C:\Users\Vrtižer\AppData\Local\Temp\jna--78847768\jna6432107568184066435.dll: Can't find dependent libraries

It’s possible to continue with the error, but the majority of Eclipse plugins won’t work.

When you look closely at the path you can see there is a special character in the word ‘Vrtižer‘. This special character with a combination of Windows feature ‘Use Unicode UTF-8 for worldwide language support‘ causes the issue.

There are several ways how to workaround the problem:

#1 Change the user environment variable TMP

Open Start, type: environment

Select Edit system environment variables

Click Environment Variables…

Select User variable with name TMP and change it to path without special character, the path must exist.

Click Ok. Start new Eclipse.

Note: the default values is

%USERPROFILE%\AppData\Local\Temp

#2 Remove the user environment variable TMP

If you do not have a special need for user-specific TMP, you can simply delete it. The system will default to System Temp.

Steps are the same as in #1, just instead of Edit, click Detete to remove the variable

Click Ok. Start new Eclipse.

#3 Disable Windows feature ‘Use Unicode UTF-8 for worldwide language support’

Open Start, search for Region settings, click Additional date, time & regional settings, click Change system locale…

Uncheck Use Unicode UTF-8 for worldwide language support, click Ok and restart the computer.

Note: disabling this setting might affect communication between PowerShell and Python scripts in the case of strings with diacritics.

Update: Issue reported to Eclipse.org.

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21. September 2021

How to install Podman on Linux Mint 20

Podman binaries for Linux Mint / Ubuntu are hosted by OpenSuse.org.

You need to add the repository to /etc/source.list.d. Common instructions for Ubuntu might not work, because VERSION_ID for Mint is not the same as for Ubuntu.

Instructions for Linux Mint 20.2 from Ubuntu 20.04 repository:

export VERSION_ID="20.04"
sudo sh -c "echo 'deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list"
sudo wget -nv https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_${VERSION_ID}/Release.key -O- | apt-key add -
sudo apt update
sudo apt install -y podman

Example of running container for IoT development:

If you’d like to develop for ESP32 chip connected to /dev/ttyUSB0 using C++ or Rust language, just start the container:

podman run --device /dev/ttyUSB0 -it docker.io/espressif/idf-rust-examples
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7. September 2021

How to increase font size of Krita UI on Windows?

Krita on Windows might display UI with a very small font:

You can increase the UI font in Krita by the following configuration. Select from the top menu: SettingsConfigure Krita…

Select General from the left pane, select Window tab, check Use Custom Interface Font, and increase the number to a value like 14. Click Ok to apply changes.

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3. September 2021

How to flash ESP32 from WSL

WSL (Windows Subsystems for Linux) is a great way how to build projects based on ESP-IDF. The problem is how to flash the image from WSL Linux to a real chip?

Right now only WSL1 supports mapping of Windows COM ports to Linux /dev/ttyS*.

First of all, make sure that your image is running WSL1 (which is slower than WSL2):

wsl -l -v

In the case of WSL2 image, you can convert it by the following command (let assume the image of Ubuntu):

wsl -t Ubuntu
wsl --set-version Ubuntu 1

Use Windows Device Manager to determine COM ports of your ESP chip. Similar could be achieved by command:

mode

The number of COM.. device will be mapped to the /dev/ttyS.. in Linux.

Start the Linux terminal (e.g. using Windows Terminal). Grant permission so that your user can read write /dev/ttyS* or add your user to dialout group if supported by distribution. Note: on Linux, the device is often mapped to /dev/ttyUSB*, notice the difference on Windows /dev/ttyS*.

chmod a+rw /dev/ttyS*

Build and flash the project. It’s necessary to specify the device name, because autodetection in idf.py is not able to find /dev/ttyS. The second important part is to set the communication speed by “-b” option.

idf.py flash --port /dev/ttyS11 -b 115200
idf.py monitor --port /dev/ttyS11

The last command should launch idf monitor, which you can terminate by CTRL+].

If you’re WSL2 user, you can try alternative approach using idfx tool.

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25. June 2021

How to disable automatic screen dimming on Windows Lenovo T14 with Intel UHD Graphics

Windows 10 on Lenovo T14 with Intel UHD Graphics has one very annoying behavior. The system automatically dims dark screens like a terminal window which becomes barely readable and the system brightens white screens like a web browser.

Here’s how you can disable this automatic dimming.

Press Windows key and type: Intel Graphics Command Center

Click icon with 4 squares a.k.a. System. Select Power tab, scroll down to Power Settings, uncheck Display Power Savings.

One other option is to dial down Power Efficiency to value like 1.

Option Enhanced Power Saving – Dims bright images for power saving – does not have effect.

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