Step 1: Download the WenQuanYi font. I'm using wenquanyizenhei.ttf. I'll attach the file later.

Step 2: Place the font file into the Ubuntu system's font directory.

Create a new folder named wqy under /usr/share/fonts, then copy the font file into it. Perform the following operations:

# cd /usr/share/fonts

# mkdir wqy

# cd wqy

# cp /...(font file path) /usr/share/fonts/wqy

Note: Make sure you remain in the wqy directory, then execute the following commands to update the font cache:

# mkfontscale

# mkfontdir

# fc-cache

After completion, open Qt, place a label on the UI, type some text, select the label, and locate the font property in the right-side property panel.

Click to expand, as shown in the image below:

Find the font you just installed. Isn't that amazing?

Cross-compile into an executable file.

Step 3:

Now it's time to set up the font on the ARM board. Copy the .ttf font file to the Qt font directory on the ARM board. In my case, it's /usr/qt/lib/fonts.

On the development board, execute:

export QT_QPA_FONTDIR=/usr/qt/lib/fonts

Step 4:

Copy the cross-compiled executable file to the development board and run it.

This experiment is based on the Xinmai AM5728 development board.

##1: SSH remote access to AM5728

ssh root@192.168.123.70

##2: Open another terminal and enter the TI5728 SDK environment:

source ~/ti5728sdk/linux-devkit/environment-setup

##3: In the SDK environment, launch Qt Creator:

~/Qt5.9.0/Tools/QtCreator/bin/qtcreator

##4: Successfully open Qt and start compiling.

##5: When compiling remotely on AM5728, add the remote target path in the .pro file:

target.path += /home/root

INSTALLS += target

Save the project, then click Project on the left toolbar --- select AM335x EVM ---- Run --- you'll see the remote execution path has been updated to the AM5728's /home/root/ directory.

##6: Run the project:

Click the green Run button at the bottom of the left toolbar to start compiling the executable, transferring it remotely to the AM5728, and running it remotely.

##7: Close the program on AM5728:

Press Ctrl+C in the SSH terminal window to exit the program currently running on AM5728.

##8: Use SSH to power off/reboot AM5728:

poweroff

reboot

##9: Use SFTP for remote file transfer between local machine and AM5728:

sftp root@192.168.123.70

Syntax: put (get) [options] source_file_or_directory destination_file_or_directory

Description: This command copies (or retrieves) the specified source file(s)/directory to the destination.

Available options:

- a: Typically used when copying directories. Preserves links, file attributes, and copies directories recursively. Equivalent to combining dpR options.

- d: Preserves links during copy.

- f: Deletes existing destination files without prompting.

- i: Opposite of -f. Prompts before overwriting destination files. Respond with 'y' to confirm overwrite—enables interactive copy.

- p: Copies not only file content but also modification time and access permissions to the new file.

- r: If the source is a directory, recursively copies all subdirectories and files. Destination must be a directory.

- l: Does not copy; creates symbolic links instead.

Example: put -r /home/lidawei0124/led /home/root/