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

[cpp] view plain copy

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#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

[cpp] view plain copy

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#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

[cpp] view plain copy

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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();

}