Programming with a blocking serial port is radically different from programming with a non-blocking serial port. If waitForReadyRead() returns false, the connection has been closed or an error has occurred. See the following example: int numRead = 0, numReadTotal = 0 Use the close() method to close the port and cancel the I/O operations. 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. Note: The serial port is always opened with exclusive access (that is, no other process or thread can access an already opened serial port). You can pass an object of the helper class as an argument to the setPort() or setPortName() methods to assign the desired serial device.Īfter setting the port, you can open it in read-only (r/o), write-only (w/o), or read-write (r/w) mode using the open() method. This is useful to obtain the correct name of the serial port you want to use. You can get information about the available serial ports using the QSerialPortInfo helper class, which allows an enumeration of all the serial ports in the system.

Provides functions to access serial ports. SetPort(const QSerialPortInfo & serialPortInfo)

SetBaudRate(qint32 baudRate, Directions directions = AllDirections) QSerialPort(const QSerialPortInfo & serialPortInfo, QObject * parent = Q_NULLPTR)īaudRate(Directions directions = AllDirections) constĬlear(Directions directions = AllDirections)

QSerialPort(const QString & name, QObject * parent = Q_NULLPTR) QSerialPort(QObject * parent = Q_NULLPTR)

Qt serial port baud rate