My main problem is how to read from serial port. My program should be able to read from serial port at Mini2440 FriendlyARM processor.īefore going to target system (embedded system), I tried to read and write from/to a serial port on my Laptop. I use Qt Creator 3.0.0 (based on Qt 5.2.0) for desktop computer. I have to develop a C++ program for an embedded FriendlyARM-based processor system. The main widget is passed as the parent, so the object deletion happens automatically according to the parent and child mechanism in Qt:Ĭonst SettingsDialog ::Settings p = m_settings - >settings() The serial port is instantiated in the MainWindow constructor. SettingsDialog ( terminal/settingsdialog.cpp) - is a dialog for configuring the serial port, as well as for displaying the available serial ports and information about them.The widget is derived from the QPlainTextEdit class. Console ( terminal/console.cpp) - is the central widget of the main window, displaying the transmitted or received data.MainWindow ( terminal/mainwindow.cpp) - is the main application window that contains all the working logic for the serial port programming, including configuration, I/O processing and so forth, while inheriting the QMainWindow.The Blocking Receiver example illustrates the synchronous approach. In this example, the asynchronous approach is demonstrated. QSerialPort::waitForReadyRead()) to suspend the calling thread until the operation has completed. In non-GUI and multithreaded applications, the waitFor.() functions can be called (i.e. When the data is sent to the serial port, QSerialPort emits bytesWritten(). For example, QSerialPort::write() returns immediately. QSerialPort emits a signal when the operation is finished. Operations are scheduled and performed when the control returns to Qt's event loop. The asynchronous (non-blocking) approach.QSerialPort supports two general programming approaches: Also, the class QSerialPortInfo is invoked to display information about the serial ports available in the system. This example shows the main features of the QSerialPort class, like configuration, I/O implementation and so forth. Terminal shows how to create a terminal for a simple serial interface by using Qt Serial Port.

Qt serial port read