QT5 串口收发实例代码

以下代码是自己测试门禁系统使用的

主要用到了串口的接收和发送

 开发环境：xp  QT5.1.1

串口：38400   N  8  1

自动检测可用串口

 

在xp上测试没问题

有些usb转串口会出现波特率不准的问题，CH340的usb转232使用完全正常

以下为收发的线程.h 和.cpp两个文件

最后附上转sacii显示的代码

如果要参考的话，源代码已上传：http://download.csdn.net/detail/liang890319/6463227

 

#ifndef MYTHREAD_H

#define MYTHREAD_H



#include <QThread>

#include <stdio.h>

#include <QtGlobal>



class MyThread : public QThread

{

    Q_OBJECT

public:

    QByteArray requestData;

    QByteArray TxData;

    MyThread();



    void setMessage(const QString &message);

    void setPortnum(const QString &num);

    void stop();

    void startCom();

    void changeTxState(bool stat);

    void changeRxState(bool stat);

    void changeComState(bool stat);



signals:

    void request(const QString &s);

    void comRecive();







protected:

    void run();



private:

    QString messageStr;

    QString portnum;

    volatile bool com_opened;

    volatile bool stopped;

    volatile bool tx_event;

    volatile bool rx_event;

};



#endif // MYTHREAD_H

 

 

 

#include "mythread.h"

#include <QtDebug>

//FOR RS232

#include <QtSerialPort/QSerialPort>

#include <QtSerialPort/QSerialPortInfo>



MyThread::MyThread()

{

   stopped=false;



}



void MyThread::run()

{

    QSerialPort *my_serialport= new QSerialPort;



    while(!stopped)

    {

        if(stopped&&com_opened)

        {

            my_serialport->close();

            com_opened=false;



        }

        if(!com_opened)

        {

            //open com

            qDebug() << "Brush:" <<"---open com port------";

            com_opened=true;

            my_serialport->setPortName(portnum);

            my_serialport->open(QIODevice::ReadWrite);

            my_serialport->setBaudRate(QSerialPort::Baud38400,QSerialPort::AllDirections);

            my_serialport->setDataBits(QSerialPort::Data8);

            my_serialport->setParity(QSerialPort::NoParity);

            my_serialport->setStopBits(QSerialPort::OneStop);

           // my_serialport->setStopBits(QSerialPort::TwoStop);

            my_serialport->setFlowControl(QSerialPort::NoFlowControl);

            com_opened=true;

        }

        if(this->com_opened&&this->tx_event)

        {

                this->tx_event=false;

                my_serialport->clear(QSerialPort::AllDirections);

                qDebug() << "Brush:" <<"send data to com2"<<this->TxData.length();

                qDebug() << "arr size:" <<this->TxData.length();

               my_serialport->write(this->TxData);

              if (my_serialport->waitForBytesWritten(5))

              {

                qDebug() << "Brush:" <<"send data success";

                if (my_serialport->waitForReadyRead(1500))  //1s

                {

                    requestData = my_serialport->readAll();

                    while (my_serialport->waitForReadyRead(15))

                    requestData += my_serialport->readAll();

                    emit(this->comRecive());

                }else

                {

                        qDebug() << "Brush:" <<"wait return time out";

                }

              }else

              {

                  qDebug() << "Brush:" <<"send time out";

              }

        }

    if (my_serialport->waitForReadyRead(5))  //50ms

    {

        while (my_serialport->waitForReadyRead(5))

        this->msleep(20);

        requestData = my_serialport->readAll();

        emit(this->comRecive());

    }

    if(stopped&&com_opened)

    {

        my_serialport->close();

        com_opened=false;

    }

    }

}



void MyThread::stop()

{

   stopped=true;



}

void MyThread::startCom()

{

   stopped=false;



}

void MyThread::changeComState(bool stat)

 {

        com_opened=stat;

}

void MyThread::setMessage(const QString &message)

{

   messageStr = message;



}

void MyThread::setPortnum(const QString &num)

{

    portnum=num;



}

void MyThread:: changeTxState(bool stat)

{

        tx_event=stat;

}

void MyThread:: changeRxState(bool stat)

{

         rx_event=stat;

}

 

显示部分 比如收到0xff  在text框显示 FF

void MainWindow::displayRxData()

{

    QString str;

    char tmp[100];

    char *buf;

    char var;

    QDateTime *datatime=new QDateTime(QDateTime::currentDateTime());

    if(threadA.requestData.size()>0)

   {

        str="收到数据: ";

        str+=datatime->time().toString();

        ui->textEdit_rx->append(str);

        str.clear();



        buf=threadA.requestData.data();

        if(buf[3]==0x01) ui->textEdit_tx->append("加卡成功！");

        if(buf[3]==0x02) ui->textEdit_tx->append("删卡成功！");

        if(buf[3]==0x03) ui->textEdit_tx->append("开门成功！");

        if(buf[3]==0x04) ui->textEdit_tx->append("关门成功！");

        qDebug() << "receive num:" <<threadA.requestData.size();

        for(var=0;var<threadA.requestData.size();var++)

        {

            ::snprintf(tmp,100, "%02X", (unsigned char)(*buf));

            buf++;

            str+=QString::fromUtf8(tmp);

            str+=" ";

        }

        ui->textEdit_rx->append(str);

    }

    threadA.requestData.clear();

}