qt 操作串口 QSerialPort

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);
}