准备工作

*.pro中加入

QT += serialport

初始化

void MainWindow::initPort()

{

    //读取串口信息

    foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts())

    {

        qDebug()<<"Name:"<<info.portName();

        qDebug()<<"Description:"<<info.description();

        qDebug()<<"Manufacturer:"<<info.manufacturer();

        //这里相当于自动识别串口号之后添加到了cmb，如果要手动选择可以用下面列表的方式添加进去

        QSerialPort serial;

        serial.setPort(info);

        if(serial.open(QIODevice::ReadWrite))

        {

            //将串口号添加到cmb

            ui->cmbPortName->addItem(info.portName());

            //关闭串口等待人为(打开串口按钮)打开

            serial.close();

        }

    }

    QStringList baudList;//波特率

    QStringList parityList;//校验位

    QStringList dataBitsList;//数据位

    QStringList stopBitsList;//停止位

    baudList<<"50"<<"75"<<"100"<<"134"<<"150"<<"200"<<"300"

           <<"600"<<"1200"<<"1800"<<"2400"<<"4800"<<"9600"

          <<"14400"<<"19200"<<"38400"<<"56000"<<"57600"

         <<"76800"<<"115200"<<"128000"<<"256000";

    ui->cmbBaudRate->addItems(baudList);

    ui->cmbBaudRate->setCurrentIndex(12);

    parityList<<"无"<<"奇"<<"偶";

    ui->cmbParity->addItems(parityList);

    ui->cmbParity->setCurrentIndex(0);

    dataBitsList<<"5"<<"6"<<"7"<<"8";

    ui->cmbDataBits->addItems(dataBitsList);

    ui->cmbDataBits->setCurrentIndex(3);

    stopBitsList<<"1";

    stopBitsList<<"1.5";

    stopBitsList<<"2";

    ui->cmbStopBits->addItems(stopBitsList);

    ui->cmbStopBits->setCurrentIndex(0);

    //设置按钮可以被按下

    ui->openCom->setCheckable(true);

    connect(ui->openCom,SIGNAL(clicked()),this,SLOT(on_btnOpen_clicked()));

    connect(ui->pushButtonSpeedSet,SIGNAL(clicked()),this,SLOT(on_btnSet_clicked()));

}

打开串口

void MainWindow::on_btnOpen_clicked()

{

    my_serialport = new QSerialPort(this);

    //设置串口号

    my_serialport->setPortName(ui->cmbPortName->currentText());

    //以读写方式打开串口

    if(my_serialport->open(QIODevice::ReadWrite))

    {

        //设置波特率

        my_serialport->setBaudRate(ui->cmbBaudRate->currentText().toInt());

        //设置数据位

        my_serialport->setDataBits(QSerialPort::Data8);

        //设置校验位

        my_serialport->setParity(QSerialPort::NoParity);

        //设置流控制

        my_serialport->setFlowControl(QSerialPort::NoFlowControl);

        //设置停止位

        my_serialport->setStopBits(QSerialPort::OneStop);

        //每秒读一次

        timer = new QTimer(this);

        connect(timer, SIGNAL(timeout()), this, SLOT(readComDataSlot()));

        timer->start(1000);

        ui->openCom->setEnabled(false);

        ui->lineEditSpeed->setText(QString("待传输"));

        ui->lineEditTemp->setText("0");

    }

    else

    {

        QMessageBox::about(NULL, "提示", "串口没有打开！");

        return;

    }

}

读

void MainWindow::readComDataSlot()

{

    //读取串口数据

    QByteArray readComData = my_serialport->readAll();

    qDebug() << "size: " << readComData.size();

    qDebug() << "data: " << readComData;

    //数据显示

    if(readComData != NULL)

    {

        ui->lineEdit->setText(QString(readComData));

    }

    //清除缓冲区

    readComData.clear();

}

写

void MainWindow::on_btnSet_clicked()

{

    //获取发送区的数据

    QString sendData = ui->lineEditSpeedSet->text();

    QByteArray sendData_2 = sendData.toLatin1();

    //写入缓冲区

    my_serialport->write(sendData_2);

}