Qt实现串口通信总结

Win_QextSerialPort  *myCom；      //Windows系统内
Posix_QextSerialPort *myCom;      //Linux系统内  

//Windows中有两种查询模式，一种polling模式，一种EventDriven模式
myCom = new Win_QextSerialPort("COM1",QextSerialBase::Polling);                 //
myCom = new Win_QextSerialPort("COM1",QextSerialBase::EventDriven);
//Linux中只有Polling模式
myCom = new Posix_QextSerialPort("/dev/ttyS0",QextSerialBase::Polling);  

myCom ->open(QIODevice::ReadWrite);    //打开模式  

myCom->setBaudRate(BAUD9600);          //波特率设置，我们设置为9600
myCom->setDataBits(DATA_8);            //数据位设置，我们设置为8位数据位
myCom->setParity(PAR_NONE);           //奇偶校验设置，我们设置为无校验
myCom->setStopBits(STOP_1);            //停止位设置，我们设置为1位停止位
myCom->setFlowControl(FLOW_OFF);      //控制流

myCom->setTimeout(long); //设置时间间隔  

connect(myCom,SIGNAL(readyRead()),this,SLOT(readMyCom()));    //EventDriven模式下才能触发readyRead（）信号
connect(readTimer,SIGNAL(timeout()),this,SLOT(readMyCom()));  //Polling模式定时器触发timeout（）信  

QByteArray temp = myCom->readAll();    //返回读取的字节
int byteLen = myCom->bytesAvailable()； //返回串口缓冲区字节数  

myCom -> Write(const char * data, qint64 maxSize );          //
myCom -> Write(const char * data );                          //
myCom -> Write(const QByteArray & byteArray);                //
int byteLen = myCom->bytesToWrite()；                        //输出写数据的字节数
//bytesWritten()信号函数来获取已经发送的数据的大小。  

QT += serialport               //加在第一行或者第二行  

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    read_port = new mythread(this);
    connect(this->read_port, SIGNAL(read_port_data()), this,  SLOT(display_data()));
}

Dialog::~Dialog()
{
    //delete this->my_serialport;
    delete ui;
}

void Dialog::on_pushButton_clicked()                   //open serial，打开串口
{
    this->read_port->start();
}

void Dialog::display_data()                            //显示数据
{
    ui->textBrowser->setText(this->read_port->requestData);
}  

//对话框头文件
#ifndef DIALOG_H
#define DIALOG_H

#include "mythread.h"

namespace Ui 
{
    class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
private slots:
    void on_pushButton_clicked();
    void display_data();
private:
    Ui::Dialog *ui;
    mythread *read_port;
};

#endif // DIALOG_H  

#include "mythread.h"

mythread::mythread(QObject *parent) :
    QThread(parent)
{
    my_serialport = new QSerialPort(this);
}

void mythread::run()
{
    this->my_serialport->setPortName("com3");
    this->my_serialport->open(QIODevice::ReadWrite);
    this->my_serialport->setBaudRate(115200);
    this->my_serialport->setDataBits(QSerialPort::Data8);
    this->my_serialport->setParity(QSerialPort::NoParity);
    this->my_serialport->setStopBits(QSerialPort::OneStop);
    this->my_serialport->setFlowControl(QSerialPort::NoFlowControl);

    while(1)
    {
        requestData = "";
        while(this->my_serialport->waitForReadyRead(10))
        {
            requestData += this->my_serialport->readAll();
        }

        if(!requestData.isEmpty())
        {
            emit(this->read_port_data());
            qDebug() << "===============" <<requestData;
        }
    }
}