Lamp

QT5
Figure 5 - Changing the text element to “Blinky for ODROID”
Figure 7 - Adding the QGPIO class to the project
bar, then choose Qt Quick Application. Next, give the project
a name and choose the directory, and configure the Qt5 project
using the “Desktop” kit.
Continue through the dialogs until the project is created.
Then, under the projects dock on the left, navigate and open
Resources -> qml.qrc-> / -> main.qml. After opening the file,
change the text inside the Text element to from “Hello World”
to “Blinky For ODROID”. Then, build and run the project
by pressing Ctrl + R. After clicking the application to close it,
open a terminal and navigate to the projects directory. At the
top of the project directory, run the following command in
order to clone the QGPIO class:
$ git clone http://github.com/Tpimp/qgpio.git
Figure 8 - Modifying the QGPIO class
the C++, create a QGpio element and set the ID to gpio200
and the number to “200”. Next, create the function callback
that will be invoked when the component is complete. In the
function, set the GPIO direction to Out, set the edge to Falling,
set active_low to false, and the value to false. Then, in the
MouseArea object, replace the onClicked function statements
to simple toggle the GPIO value:
gpio200.value = !gpio200.value;
Figure 6 - Cloning the QGPIO project
Go back to the QtCreator application and right-click
“blinky-ODROID” in the project dock, select “Add Existing
Directory…” from the context menu, then choose the directories
as shown in Figure 7. After adding the directory from the
projects dock, navigate and open Sources -> main.cpp. Alter
it to look like Figure 8. Note that this step is related to using
QGPIO, not writing a general Qt5 application.
Next, we can make the “Blinky” part of the application. Reopen
the main.qml file for editing.
After importing the com.embedded.io module defined in
Figure 9 - Modifying the main.qml file
Run the program and click on the center, then observe the
value of GPIO 200 changing by typing the following command
into a Terminal window:
ODROID MAGAZINE 29