2021/4/20 基于QT5的串口通讯程序编写

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serial.pro

QT       += core gui
QT       += serialport
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += 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 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

FORMS += \
    widget.ui

TRANSLATIONS += \
    serialPort_zh_CN.ts

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QSerialPort>
#include <QSerialPortInfo>
#include <QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
    QSerialPort serial;
    void SetDefaultChoice();

private slots:
   void ConfigSerial();
   void ReadSerial();
   void SendSerial();
   void CloseSerialPort();
   void ClearMSG();
};

class GlobalVariable
{
public:
    static qint32 CharacterCounter;
};

#endif // WIDGET_H

main.cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"

qint32 GlobalVariable::CharacterCounter = 0;

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    QObject::connect(&serial, &QSerialPort::readyRead, this, &Widget::ReadSerial);
    QObject::connect(ui->pushButton, &QPushButton::clicked, this, &Widget::ConfigSerial);
    QObject::connect(ui->pushButton_2, &QPushButton::clicked, this, &Widget::CloseSerialPort);
    QObject::connect(ui->pushButton_3, &QPushButton::clicked, this, &Widget::ClearMSG);
    QObject::connect(ui->pushButton_4, &QPushButton::clicked, this, &Widget::SendSerial);
    Widget::SetDefaultChoice();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::SetDefaultChoice()
{
    ui->comboBox->setCurrentIndex(0);
    ui->comboBox_2->setCurrentIndex(5);
    ui->comboBox_3->setCurrentIndex(0);
    ui->comboBox_4->setCurrentIndex(0);
    ui->comboBox_5->setCurrentIndex(0);
    ui->comboBox_6->setCurrentIndex(0);
}

void Widget::ConfigSerial()
{
    QString ComNumber;
    qint32 BaudRate;
    ComNumber = ui->comboBox->currentText();
    BaudRate = ui->comboBox_2->currentText().toInt();

    //端口号
    serial.setPortName(ComNumber);

    //波特率
    serial.setBaudRate(BaudRate);

    //奇偶校验位
    switch (ui->comboBox_4->currentIndex()) {
    case 0: serial.setParity(QSerialPort::NoParity); break;
    case 1: serial.setParity(QSerialPort::OddParity); break;
    case 2: serial.setParity(QSerialPort::SpaceParity); break;
    default: serial.setParity(QSerialPort::NoParity);
    }

    //数据位
    switch (ui->comboBox_4->currentIndex()) {
    case 0: serial.setDataBits(QSerialPort::Data8); break;
    case 1: serial.setDataBits(QSerialPort::Data7); break;
    case 2: serial.setDataBits(QSerialPort::Data6); break;
    default: serial.setDataBits(QSerialPort::Data8);
    }

    //设置停止位
    switch (ui->comboBox_5->currentIndex()) {
    case 0: serial.setStopBits(QSerialPort::OneStop); break;
    case 1: serial.setStopBits(QSerialPort::TwoStop); break;
    default: serial.setStopBits(QSerialPort::OneStop);
    }

    //设置流控制
    switch (ui->comboBox_6->currentIndex()) {
    case 0: serial.setFlowControl(QSerialPort::NoFlowControl); break;
    case 1: serial.setFlowControl(QSerialPort::HardwareControl); break;
    case 2: serial.setFlowControl(QSerialPort::SoftwareControl); break;
    default: serial.setFlowControl(QSerialPort::NoFlowControl);
    }

    //打开串口
    serial.open(QIODevice::ReadWrite);
    ui->pushButton->setDisabled(true);
    ui->textEdit->clear();
}

void Widget::ReadSerial()
{
    //从接收缓冲区中读取数据
    QByteArray buffer = serial.readAll();
    if(ui->checkBox->isChecked())
    {
        ui->textEdit->append(buffer.toHex());
    }
    else
        ui->textEdit->append(buffer);

    GlobalVariable::CharacterCounter += buffer.length();
    ui->label_7->setText(QString::number(GlobalVariable::CharacterCounter));
}

void Widget::SendSerial()
{
    QByteArray content;
    if(ui->checkBox_2->isChecked())
        content = ui->textEdit_2->toPlainText().toLatin1().toHex();
    else
        content = ui->textEdit_2->toPlainText().toUtf8();
    if(serial.isOpen())
    {
        serial.write(content, content.length());
        ui->textEdit_2->clear();
    }
}

void Widget::CloseSerialPort()
{
    if(serial.isOpen())
    {
        serial.close();
        ui->pushButton->setEnabled(true);
    }
}

void Widget::ClearMSG()
{
    ui->textEdit->clear();
    GlobalVariable::CharacterCounter = 0;
    ui->label_7->setText(0);
}

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