波特率115200=115200位/s=11520字节/s(无校验位)
多个串口和网络发来的数据，需处理。波特率9600约等于1000个字节/s的数据，
尤其在ARM上直接卡–>多线程–>一个线程收数据—>一个线程处理数据
当协议一样，要将串口数据解析转为网络端口监听，之前可用tcp通信处理。
还可以：各种数据接收后排队存入一个全局变量，再单独开辟一个线程从这个全局变量读取第一个数据，处理完则移除第一个数据。Qt中的链表直接提供了一个takeFirst函数，用while循环读取，在读取的时候加锁，这样的话就不会冲突了。

独立处理数据线程：

#ifndef TEST_H
#define TEST_H
#include "qthread.h"
#include "qmutex.h"
class Thread : public QThread
{Q_OBJECT
public:Thread();~Thread();void stop();
protected:void run();
private:QMutex mutex;volatile bool stopped;
signals:void readOne(QString txt);
};
#endif // TEST_H

#include "thread.h"
#include "app.h"
Thread::Thread()
{
stopped=false;
}
Thread::~Thread()
{
}
void Thread::stop()
{stopped=true;
}
void Thread::run()
{while(!stopped){mutex.lock();if (App::list.count()>0){            QString txt=App::list.takeFirst();emit readOne(txt);}mutex.unlock();msleep(1);//不加这句CPU占用率高达50%}stopped=false;
}

主界面：

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include "thread.h"
#include "qtimer.h"
namespace Ui {
class frmMain;
}
class frmMain : public QWidget
{Q_OBJECT
public:explicit frmMain(QWidget *parent = 0);~frmMain();
private slots:void writeOne();void readOne(QString txt);void on_btnAppend_clicked();void on_btnThread_clicked();void on_btnTimer_clicked();
private:Ui::frmMain *ui;QTimer *timer;Thread *thread;
};
#endif // WIDGET_H

#include "frmmain.h"
#include "ui_frmmain.h"
#include "app.h"
#include "qdatetime.h"
#include "qdesktopwidget.h"
#define _TIME_ qPrintable (QTime::currentTime().toString("now : hh:mm:ss:zzz"))
frmMain::frmMain(QWidget *parent) :QWidget(parent),ui(new Ui::frmMain)
{ui->setupUi(this);this->showMaximized();timer=new QTimer(this);timer->setInterval(50);connect(timer,SIGNAL(timeout()),this,SLOT(writeOne()));thread=new Thread;connect(thread,SIGNAL(readOne(QString)),this,SLOT(readOne(QString)));
}
frmMain::~frmMain()
{delete ui;
}
void frmMain::writeOne()
{App::list.append(_TIME_);
}
void frmMain::readOne(QString txt)
{ui->txtOut->append(txt);
}
void frmMain::on_btnAppend_clicked()
{App::list.append(ui->txtIn->text());
}
void frmMain::on_btnThread_clicked()
{if (ui->btnThread->text()=="start thread"){thread->start();ui->btnThread->setText("stop thread");ui->txtOut->append("start thread ok");}else{thread->stop();ui->btnThread->setText("start thread");ui->txtOut->append("stop thread ok");}
}
void frmMain::on_btnTimer_clicked()
{if (ui->btnTimer->text()=="start timer"){timer->start();ui->btnTimer->setText("stop timer");ui->txtOut->append("start timer ok");}else{timer->stop();ui->btnTimer->setText("start timer");ui->txtOut->append("stop timer ok");}
}