Qt 5. QSerialPort串口收发

1. 代码

//ex2.cpp
#include "ex2.h"
#include "ui_ex2.h"
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>int static cnt = 0;Ex2::Ex2(QWidget *parent): QDialog(parent), ui(new Ui::Ex2)
{ui->setupUi(this);//查找可用的串口foreach(const QSerialPortInfo &info, QSerialPortInfo::availablePorts()){QSerialPort serial;serial.setPort(info);if(serial.open(QIODevice::ReadWrite)){ui->comboBox_PortBox->addItem(serial.portName());serial.close();}}//设置波特率下拉菜单默认显示第三项ui->comboBox_BaudBox->addItem("2400");ui->comboBox_BaudBox->addItem("4800");ui->comboBox_BaudBox->addItem("9600");ui->comboBox_BaudBox->addItem("19200");ui->comboBox_BaudBox->addItem("115200");ui->comboBox_BaudBox->setCurrentIndex(0);//关闭发送按钮的使能ui->sendButton->setEnabled(false);
}Ex2::~Ex2()
{delete ui;
}void Ex2::on_pushButtonMy1_clicked()
{cnt ++;QString str = QString::number(cnt,10);ui->textEditMy1->setText(str);
}void Ex2::on_pushButtonMy2_clicked()
{if(cnt > 0) cnt --;QString str = QString::number(cnt,10);ui->textEditMy1->setText(str);
}void Ex2::on_pushButtonClr_clicked()
{ui->textEditMy1->clear();
}void Ex2::on_pushButtonComm_clicked()
{QList<QSerialPortInfo> list = QSerialPortInfo::availablePorts();ui->textEditMy1->setText("Total number of availiable ports:" + QString::number(list.count(), 10));foreach(const QSerialPortInfo &serialportinfo, list){ui->textEditMy1->append( "===========================================");ui->textEditMy1->append( "Port: " + serialportinfo.portName());ui->textEditMy1->append( "Location: " + serialportinfo.systemLocation());ui->textEditMy1->append( "Description: " + serialportinfo.description());ui->textEditMy1->append( "Manufactutor: " + serialportinfo.manufacturer());ui->textEditMy1->append( "Vendor Indentifier: " + QString::number(serialportinfo.vendorIdentifier(), 10));ui->textEditMy1->append( "Busy: " + QString::number(serialportinfo.isBusy()));}
}//读取接收到的数据
void Ex2::Read_Data()
{QByteArray buf;buf = serial->readAll();if(!buf.isEmpty()){QString str = ui->textEditMy1->toPlainText();str+=tr(buf);ui->textEditMy1->clear();ui->textEditMy1->append(str);}buf.clear();
}void Ex2::on_sendButton_clicked()
{serial->write(ui->textEditMy2->toPlainText().toLatin1());
}void Ex2::on_openButton_clicked()
{if(ui->openButton->text()==tr("打开串口")){serial = new QSerialPort;//设置串口名serial->setPortName(ui->comboBox_PortBox->currentText());//打开串口serial->open(QIODevice::ReadWrite);//设置波特率serial->setBaudRate(ui->comboBox_BaudBox->currentText().toInt());//设置数据位数serial->setDataBits(QSerialPort::Data8);//设置奇偶校验serial->setParity(QSerialPort::NoParity);//设置停止位serial->setStopBits(QSerialPort::OneStop);//设置流控制serial->setFlowControl(QSerialPort::NoFlowControl);//关闭设置菜单使能ui->comboBox_PortBox->setEnabled(false);ui->comboBox_BaudBox->setEnabled(false);ui->openButton->setText(tr("关闭串口"));ui->sendButton->setEnabled(true);//连接信号槽QObject::connect(serial, &QSerialPort::readyRead, this, &Ex2::Read_Data);}else{//关闭串口serial->clear();serial->close();serial->deleteLater();//恢复设置使能ui->comboBox_PortBox->setEnabled(true);ui->comboBox_BaudBox->setEnabled(true);ui->openButton->setText(tr("打开串口"));ui->sendButton->setEnabled(false);}
}//main.cpp
#include "ex2.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Ex2 w;w.show();return a.exec();
}//ex2.pro
//在ex2.pro 添加：QT += serialport
QT       += core guiQT += serialportgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \ex2.cppHEADERS += \ex2.hFORMS += \ex2.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

2.效果

RX-TX短接