Qt 串口通讯

整理一下关于Qt串口通讯

程序下载地址：http://download.csdn.net/detail/u012166958/9561553

串口通讯使用的类为

QSerialPort Class

公共类型：

enum BaudRate { Baud1200, Baud2400, Baud4800, Baud9600, ..., UnknownBaud } //波特率

enum DataBits { Data5, Data6, Data7, Data8, UnknownDataBits } //数据位

enum Direction { Input, Output, AllDirections } //输入（输出）方向

flags Directions

enum FlowControl { NoFlowControl, HardwareControl, Software

enum Parity { NoParity, EvenParity, OddParity, SpaceParity, MarkParity, UnknownParity }//奇偶校验

enum PinoutSignal { NoSignal, TransmittedDataSignal, ReceivedDataSignal, DataTerminalReadySignal, ..., SecondaryReceivedDataSignal }

flags PinoutSignalsenum SerialPortError { NoError, DeviceNotFoundError, PermissionError, OpenError, ..., UnknownError }

enum StopBits { OneStop, OneAndHalfStop, TwoStop, UnknownStopBits } //停止位

函数

void QSerialPort::setPort(const QSerialPortInfo & serialPortInfo)

void QSerialPort::setPortName(const QString & name) //设置端口名称

qint32 baudRate(Directions directions = AllDirections) const

bool setBaudRate(qint32 baudRate, Directions directions = AllDirections)//设置波特率

DataBits

dataBits() const

bool setDataBits(DataBits dataBits)  //数据位设置

Parity parity() const

bool setParity(Parity parity)  //设置奇偶校验

StopBits stopBits() const

bool  setStopBits(StopBits stopBits)/设置停止位

FlowControl <span style="font-family: Arial, Helvetica, sans-serif;">flowControl() const</span>

bool setFlowControl(FlowControl flowControl) //设置硬件流

bool QSerialPort::open(OpenMode mode)<span style="white-space:pre"> </span>//打开串口

打开方式

QIODevice::NotOpen  0x0000  The device is not open.

QIODevice::ReadOnly 0x0001  The device is open for reading.

QIODevice::WriteOnly  0x0002 The device is open for writing. Note that this mode implies Truncate.

QIODevice::ReadWrite  ReadOnly | WriteOnly  The device is open for reading and writing.

QIODevice::Append  0x0004 The device is opened in append mode so that all data is written to the end of the file.

QIODevice::Truncate  0x0008 If possible, the device is truncated before it is opened. All earlier contents of the device are lost. 

QIODevice::Text  0x0010 When reading, the end-of-line terminators are translated to '\n'. When writing, the end-of-line terminators are translated to the local encoding, for example '\r\n' for Win32.

QIODevice::Unbuffered 0x0020 Any buffer in the device is bypassed. virtual 

void close()//关闭

QByteArray QIODevice::readAll()//读函数

qint64 QIODevice::write(const char * data) 

qint64 QIODevice::write(const QByteArray & byteArray)

qint64 QIODevice::write(const char * data, qint64 maxSize)//写函数

1、与编写网络一样在 .pro 文件中添加

QT += serialport

2、使用的库

#include <QtSerialPort/QSerialPort>

#include <QtSerialPort/QSerialPortInfo>

</pre><pre name="code" class="html">#ifndef SERIALPORT_H
#define SERIALPORT_H
#include <QMainWindow>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QByteArray>
#include <QTimer>
namespace Ui {
class SerialPort;
}
class SerialPort : public QMainWindow
{
Q_OBJECT
public:
explicit SerialPort(QWidget *parent = 0);
~SerialPort();
private slots:
void on_OpenPushButton_clicked();
void on_ClosePushButton_clicked();
void on_SendPushButton_clicked();
void Updates();
private:
Ui::SerialPort *ui;
QSerialPort *mySerialPort;
QByteArray requestData;
QTimer *timer;
void sendData();
};
#endif // SERIALPORT_H

#include "serialport.h"
#include "ui_serialport.h"
#include <QDebug>
SerialPort::SerialPort(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::SerialPort)
{
ui->setupUi(this);
ui->baudRatecomboBox->setCurrentIndex(5);
ui->DataBitsComboBox->setCurrentIndex(3);
ui->parityComboBox->setCurrentIndex(0);
ui->stopBitsComboBox->setCurrentIndex(0);
foreach (const QSerialPortInfo &info,QSerialPortInfo::availablePorts())
{
qDebug()<<"Name        :"<<info.portName();
qDebug()<<"Description :"<<info.description();
qDebug()<<"Manufacturer:"<<info.manufacturer();
QSerialPort serial;
serial.setPort(info);
if(serial.open(QIODevice::ReadWrite))
{
ui->ProtsComboBox->addItem(info.portName());
serial.close();
}
}
}
SerialPort::~SerialPort()
{
mySerialPort->close();
delete ui;
}
void SerialPort::on_OpenPushButton_clicked()
{
mySerialPort = new QSerialPort();
qDebug()<<ui->ProtsComboBox->currentText();
mySerialPort->setPortName(ui->ProtsComboBox->currentText());
mySerialPort->open(QIODevice::ReadWrite);
mySerialPort->setBaudRate(ui->baudRatecomboBox->currentText().toInt());
//数据位
int dataBitNumber = ui->DataBitsComboBox->currentText().toInt();
switch(dataBitNumber)
{
case 5:
mySerialPort->setDataBits(QSerialPort::Data5);
break;
case 6:
mySerialPort->setDataBits(QSerialPort::Data6);
break;
case 7:
mySerialPort->setDataBits(QSerialPort::Data7);
break;
case 8:
mySerialPort->setDataBits(QSerialPort::Data8);
break;
default:
break;
}
//
QSerialPort::NoParity;
QSerialPort::Baud1200;
mySerialPort->setParity(QSerialPort::NoParity);//无奇偶校验
if(ui->stopBitsComboBox->currentText() == "1")
{
mySerialPort->setStopBits(QSerialPort::OneStop);
}
else if(ui->stopBitsComboBox->currentText() =="1.5")
{
mySerialPort->setStopBits(QSerialPort::OneAndHalfStop);
}
else if(ui->stopBitsComboBox->currentText() =="2")
{
mySerialPort->setStopBits(QSerialPort::TwoStop);
}
mySerialPort->setFlowControl(QSerialPort::NoFlowControl);
timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(Updates()));
timer->start(1000);
}
void SerialPort::on_ClosePushButton_clicked()
{
mySerialPort->close();
}
void  SerialPort::Updates()
{
qDebug()<<"this is a test!";
requestData = mySerialPort->readAll();
if(requestData !=NULL)
{
ui->datasTextEdit->append(requestData);
}
requestData.clear();
}
void SerialPort::on_SendPushButton_clicked()
{
mySerialPort->write(ui->sendLineEdit->text().toLatin1());
}