![]() The QSerialPort class can also be used with QTextStream and QDataStream's stream operators (operator>()). However, in a GUI application, blocking serial port should only be used in non-GUI threads, to avoid freezing the user interface.įor more details about these approaches, refer to the example applications. A blocking serial port does not require an event loop and typically leads to simpler code. Programming with a blocking serial port is radically different from programming with a non-blocking serial port. These kind of errors need to be handled by the application code, probably using OS system specific ioctls on the device descriptor and/or parsing the stream's byte-stuffing. Note: Not all error conditions are handled in a platform independent way in QSerialport, as for example the Framing, Parity, and Break condition errors. waitForBytesWritten() blocks calls until one payload of data has been written to the serial port.waitForReadyRead() blocks calls until new data is available for reading.These functions can be used to implement blocking serial ports: QSerialPort provides a set of functions that suspend the calling thread until certain signals are emitted. You can limit the size of the read buffer using setReadBufferSize(). If not all the data is read at once, the remaining data will be available for later as new incoming data is appended to the QSerialPort's internal read buffer. Alternatively the readLine() and readAll() convenience methods can also be invoked. Once you know that the ports are ready to read or write, you can use the read() or write() methods. It is also possible to use the pinoutSignals() method to query the current pinout signals set. There are a couple of properties to work with the pinout signals namely: QSerialPort::dataTerminalReady, QSerialPort::requestToSend. You can reconfigure the port to the desired setting using the setBaudRate(), setDataBits(), setParity(), setStopBits(), and setFlowControl() methods. Having successfully opened, QSerialPort tries to determine the current configuration of the port and initializes itself. Use the close() method to close the port and cancel the I/O operations. Note: The serial port is always opened with exclusive access (that is, no other process or thread can access an already opened serial port). SetStopBits(QSerialPort::StopBits stopBits) SetPort(const QSerialPortInfo & serialPortInfo) ![]() SetFlowControl(QSerialPort::FlowControl flowControl) SetDataBits(QSerialPort::DataBits dataBits) SetBaudRate(qint32 baudRate, QSerialPort::Directions directions = AllDirections) QSerialPort(const QString & name, QObject * parent = nullptr)īaudRate(QSerialPort::Directions directions = AllDirections) constĬlear(QSerialPort::Directions directions = AllDirections) QSerialPort(const QSerialPortInfo & serialPortInfo, QObject * parent = nullptr)
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