串口助手

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    char ConvertHexChar(char ch);
    void String2Hex(QString str, QByteArray &senddata);

private:
    Ui::MainWindow *ui;
    QSerialPort *my_serialport;
    bool isOpen;
private slots:
    void my_readData();  //读取串口数据的槽
    void my_sendData();  //发送数据的槽
    void set_SerialPort();
};

#endif // MAINWINDOW_H

//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    isOpen = false;
    //遍历可用的串口
    foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts())
    {
        QSerialPort serial;
        serial.setPort(info);
        //串口可打开则放到列表选项上
        if (serial.open(QIODevice::ReadWrite))
        {
            ui->PortComboBox->addItem(info.portName());
            serial.close();
        }
    }
     my_serialport= new QSerialPort();//初始化串口

    QObject::connect(ui->OpenButton,SIGNAL(clicked(bool)),this,SLOT(set_SerialPort())); //打开按钮按下时触发
    QObject::connect(my_serialport,SIGNAL(readyRead()),this,SLOT(my_readData()));       //接收到数据时触发
    QObject::connect(ui->SendButton,SIGNAL(clicked(bool)),this,SLOT(my_sendData()));    //发送按钮按下时触发
}

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


void MainWindow::my_readData()
{
    QByteArray requestData;
    requestData = my_serialport->readAll();    //读取数据
    if(requestData!= NULL)
    {
        if(ui->HexCheckBox->isChecked())
        {
            ui->ReceiveTextEdit->append(tr(requestData.toHex())); //使用16进制显示
        }
        else
        {
            ui->ReceiveTextEdit->append(tr(requestData));
        }
    }
    requestData.clear();
}

void MainWindow::set_SerialPort()
{
   if(!isOpen)
   {
       isOpen = true;
       my_serialport->setPortName(ui->PortComboBox->currentText()); //设置端口号
       my_serialport->open(QIODevice::ReadWrite);      //要先打开才能设置，否则出错
       my_serialport->setBaudRate(ui->BaudComboBox->currentText().toInt()); //设置波特率
       switch(ui->DataBitComboBox->currentIndex())  //设置数据位
       {
       case 0: my_serialport->setDataBits(QSerialPort::Data8);break;
       case 1: my_serialport->setDataBits(QSerialPort::Data7);break;
       case 2: my_serialport->setDataBits(QSerialPort::Data6);break;
       }
       switch(ui->StopBitComboBox->currentIndex())  //设置停止位
       {
       case 0: my_serialport->setStopBits(QSerialPort::OneStop);break;
       case 1: my_serialport->setStopBits(QSerialPort::TwoStop);break;
       }
       my_serialport->setParity(QSerialPort::NoParity);  //校验位
       my_serialport->setFlowControl(QSerialPort::NoFlowControl); //流控

       ui->OpenButton->setText("关闭串口");
       connect(my_serialport,SIGNAL(readyRead()),this,SLOT(my_readData()));  //可以接收串口数据了
   }
   else
   {
       isOpen = false;
       ui->OpenButton->setText("打开串口");
       my_serialport->close();
   }

}

void MainWindow::my_sendData()
{
    if(ui->HexSendCheckBox->isChecked())
    {
        QByteArray sendData;
        String2Hex(ui->SendTextEdit->toPlainText(),sendData);   //16进制发送
        my_serialport->write(sendData);
    }
    else
    {
        my_serialport->write(ui->SendTextEdit->toPlainText().toLatin1());
    }

}

//将一个字符串转换成字节数组
void MainWindow::String2Hex(QString str, QByteArray &senddata)
{
    int hexdata,lowhexdata;
    int hexdatalen = 0;
    int len = str.length();    //字符串长度
    senddata.resize(len/2);    //两个字符转成一个字节的16进制，所以先预定一个大小
    char lstr,hstr;
    for(int i=0; i<len; )
    {
        hstr=str[i].toLatin1(); //将每个字符都转成ASCII码
        if(hstr == ' ')         //判断是否为空格
        {
            i++;
            continue;
        }
        i++;
        if(i >= len)
            break;
        lstr = str[i].toLatin1();
        hexdata = ConvertHexChar(hstr);  //字符转换成16进制数
        lowhexdata = ConvertHexChar(lstr);
        if((hexdata == 16) || (lowhexdata == 16))
            break;
        else
            hexdata = hexdata*16+lowhexdata;   //两个字符转成一个字节的16进制数
        i++;
        senddata[hexdatalen] = (char)hexdata;  //保存到字节数组中
        hexdatalen++;
    }
    senddata.resize(hexdatalen);                //设置实际的字节数组大小
}

//将一个字符转换成16进制数
char MainWindow::ConvertHexChar(char ch)
{
    if((ch >= '0') && (ch <= '9'))
        return ch-0x30;
    else if((ch >= 'A') && (ch <= 'F'))
        return ch-'A'+10;
    else if((ch >= 'a') && (ch <= 'f'))
        return ch-'a'+10;
    else return (-1);
}