忙了两三天了，总算得空记录一下QT串口，文末会有总的工程文件上传，多谢大家捧场。
之前博文写过PyQT，目前我逐渐偏向C++了，但主要代码思想没有变，如下：

第一，在QTdesigner下，建立好UI，如下图：

UI细节就不详细说了，具体可以看文末连接的工程文件

第二，新建串口线程类，这里要说明一下，QT本身已有串口类，我这里继承了QThread后，在类内添加串口类成员，代码如下：

#ifndef TASERIALTHREAD_H
#define TASERIALTHREAD_H#include <QThread>
#include <QtSerialPort>
#include <QSerialPortInfo>
#include <QString>class TA_SerialThread:public QThread
{
public:TA_SerialThread();~TA_SerialThread();public:uint8_t portCnt;QSerialPort *m_arrSerial;//ptr point to an array,maxium port num is 5public:void SearchPort(void);void InitPortName(uint8_t portIndex,const QString &portName);void InitPortBaudRate(uint8_t portIndex,qint32 baudRate);void InitPortDataBits(uint8_t portIndex,QSerialPort::DataBits dataBits);void InitPortParity(uint8_t portIndex,QSerialPort::Parity parity);void InitPortStopBits(uint8_t portIndex,QSerialPort::StopBits stopBits);void OpenPort(uint8_t portIndex);void ClosePort(uint8_t portIndex);void SendDataBuf(uint8_t portIndex,const QByteArray &str);QByteArray GetDataBuf(uint8_t portIndex);private slots:void run();
};
#endif // TASERIALTHREAD_H

有几处说明，

QSerialPort *m_arrSerial;

指针用于存储多个串口，当串口数组用了

uint8_t portCnt;

用于标记当前串口的总个数
portIndex用于明确对哪个串口操作

第三，新建主窗口类，目的是将ui与底层连接起来，把二者融合在一个类里，类如下：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include "taserialthread.h"namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();public slots:void MWOnoffPort(void);void MWSendCmd(void);void MWReadData(void);void MWClearRecv(void);void MWRSNumDisplay(void);private:Ui::MainWindow *ui;TA_SerialThread *sPortThread;volatile uint32_t m_recvNum;volatile uint32_t m_sendNum;
};#endif // MAINWINDOW_H

都是通过私有成员的方式，添加进类MainWindow

第四，信号与槽连接以及细节处理

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);m_recvNum = 0;m_sendNum = 0;sPortThread = new TA_SerialThread;sPortThread->SearchPort();for(uint8_t i = 0;i < sPortThread->portCnt;i++)ui->comboBox_SPortName->addItem(sPortThread->m_arrSerial[i].portName());//0:1200 1:2400 2:4800 3:9600 4:19200 5:38400 6:57600 7:115200ui->comboBox_SPortBaud->setCurrentIndex(3);//0:5 1:6 2:7 3:8ui->comboBox_SPortDataBit->setCurrentIndex(3);//0:no p 2:e p 3:o p 4:s p 5:m pui->comboBox_SPortOEBit->setCurrentIndex(0);//0:1 1:2 2:1.5ui->comboBox_SPortStopBit->setCurrentIndex(0);ui->pushButton_SendCmd->setEnabled(false);ui->graphicsView_ComStatus->setStyleSheet("background-color: rgb(255, 0, 0);");ui->label_ComStatus->setText(tr("串口状态： 断开"));connect(ui->pushButton_OpenCom, SIGNAL(clicked(bool)), this, SLOT(MWOnoffPort()));connect(ui->pushButton_SendCmd, SIGNAL(clicked(bool)), this, SLOT(MWSendCmd()));connect(ui->pushButton_ClearRecv,SIGNAL(clicked(bool)),this, SLOT(MWClearRecv()));
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::MWOnoffPort(void)
{uint8_t comIndex = ui->comboBox_SPortName->currentIndex();if(ui->pushButton_OpenCom->text()==tr("打开串口")){sPortThread->InitPortName(comIndex,ui->comboBox_SPortName->currentText());sPortThread->InitPortBaudRate(comIndex,ui->comboBox_SPortBaud->currentText().toInt());//qDebug()<<ui->comboBox_SPortDataBit->currentIndex();switch(ui->comboBox_SPortDataBit->currentIndex()){case 0: sPortThread->InitPortDataBits(comIndex,QSerialPort::Data5); break;//0:5case 1: sPortThread->InitPortDataBits(comIndex,QSerialPort::Data6); break;//1:6case 2: sPortThread->InitPortDataBits(comIndex,QSerialPort::Data7); break;//2:7case 3: sPortThread->InitPortDataBits(comIndex,QSerialPort::Data8); break;//3:8default: break;}switch(ui->comboBox_SPortStopBit->currentIndex()){case 0:sPortThread->InitPortStopBits(comIndex,QSerialPort::OneStop);break;case 1:sPortThread->InitPortStopBits(comIndex,QSerialPort::TwoStop);break;case 2:sPortThread->InitPortStopBits(comIndex,QSerialPort::OneAndHalfStop);break;default: break;}switch(ui->comboBox_SPortOEBit->currentIndex()){case 0:sPortThread->InitPortParity(comIndex,QSerialPort::NoParity);break;case 1:sPortThread->InitPortParity(comIndex,QSerialPort::EvenParity);break;case 2:sPortThread->InitPortParity(comIndex,QSerialPort::OddParity);break;case 3:sPortThread->InitPortParity(comIndex,QSerialPort::SpaceParity);break;case 4:sPortThread->InitPortParity(comIndex,QSerialPort::MarkParity);break;default: break;}sPortThread->OpenPort(comIndex);connect(&(sPortThread->m_arrSerial[comIndex]), SIGNAL(readyRead()), this, SLOT(MWReadData()));//参数设置禁止ui->comboBox_SPortName->setEnabled(false);ui->comboBox_SPortBaud->setEnabled(false);ui->comboBox_SPortDataBit->setEnabled(false);ui->comboBox_SPortOEBit->setEnabled(false);ui->comboBox_SPortStopBit->setEnabled(false);ui->pushButton_OpenCom->setText(tr("关闭串口"));//发送设置使能ui->pushButton_SendCmd->setEnabled(true);ui->graphicsView_ComStatus->setStyleSheet("background-color: rgb(0, 255, 0);");ui->label_ComStatus->setText(tr("串口状态： 连接"));}else{sPortThread->ClosePort(comIndex);//参数设置使能ui->comboBox_SPortName->setEnabled(true);ui->comboBox_SPortBaud->setEnabled(true);ui->comboBox_SPortDataBit->setEnabled(true);ui->comboBox_SPortOEBit->setEnabled(true);ui->comboBox_SPortStopBit->setEnabled(true);ui->pushButton_OpenCom->setText(tr("打开串口"));//发送设置禁止ui->pushButton_SendCmd->setEnabled(false);ui->graphicsView_ComStatus->setStyleSheet("background-color: rgb(255, 0, 0);");ui->label_ComStatus->setText(tr("串口状态： 断开"));}
}void MainWindow::MWSendCmd(void)
{sPortThread->SendDataBuf(ui->comboBox_SPortName->currentIndex(),ui->textEdit->toPlainText().toLatin1());m_sendNum +=  (ui->textEdit->toPlainText().toLatin1()).length();MWRSNumDisplay();
}void MainWindow::MWReadData(void)
{QByteArray buf;buf = sPortThread->GetDataBuf(ui->comboBox_SPortName->currentIndex());if(!buf.isEmpty()){QString str = ui->textBrowser->toPlainText();str += tr(buf);ui->textBrowser->clear();ui->textBrowser->append(str);m_recvNum += tr(buf).length();MWRSNumDisplay();}buf.clear();
}void MainWindow::MWClearRecv(void)
{ui->textBrowser->clear();m_recvNum = 0;m_sendNum = 0;MWRSNumDisplay();
}void MainWindow::MWRSNumDisplay(void)
{ui->label_RecvNum->setText(tr("已接收：") + QString::number(m_recvNum,10));ui->label_SendNum->setText(tr("已发送：") + QString::number(m_sendNum,10));
}

看一下运行效果，
运行后

打开串口，发送指令

主要功能是，按SET+电压值+V的格式向DSP28335发送命令，如果DSP正确解析命令并调节出相应电压值，则返回V，经多次测试OK。

logo和自适应窗口大小还没做，界面还比较单调，以后会逐渐完善的

总体上，本工程可实现多个串口多线程通信，但是，目前的工程文件，只实现了基本框架以及基本的串口功能，该功能预留了框架，有些地方还在扩展中，时间关系，以后会逐渐更新。以下是全部工程压缩文件，欢迎大家拍砖哈
https://download.csdn.net/download/ysgjiangsu/10329501