5.3 Build QT Application

In the previous section, a QT5 project named as helloworld has been created. It is shown in the project manage of QtCreator as below:

Figure 5-3-1 Project Manager of QtCreator

Double click the mainwindow.ui at the left side to open the Design view for designing a UI for helloworld project visually. Please drag a Label widget to the center of the mainwindow from the widgets list, double click the label and input `Hello, world!".

Figure 5-3-2 UI Design View

After complete, choose Build->Build Project in the main menu of QtCreator to build the helloworld project. Some log information outputs to the Compile Output sub window during compiling, in case of any erros and warning, please fix them and build again.

Figure 5-3-3 Build Project

After building, a binary format QT5 application is generated at ~/build-helloworld-myir_dev_kit-Debug/, please use file command to check it and make sure it can work on ARM embedded Linux system as below:

file helloworld
helloworld: ELF 32-bit LSB executable, ARM, version 1 (GNU/Linux), dynamically linked
 (uses shared libs), for GNU/Linux 4.1.0, not stripped

Finaly, please copy the binary format application helloworld to /usr/bin directory of MYD-C437X-PRU development board and execute as below:

# helloworld  --platform linuxfb:fb=/dev/fb0

A Window with a Hello,World! text label displays on the LCD screen as below:

Figure 5-3-4 Execute QT5 Application