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_OBJECTpublic: 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();}