qesptest.cpp

QT 下linux串口类

/* qesptest.cpp
**************************************/
#include "qesptest.h"
#include <qextserialport.h>
#include <QLayout>
#include <QLineEdit>
#include <QTextEdit>
#include <QPushButton>
#include <QSpinBox>

QespTest::QespTest(QWidget* parent) 
	: QWidget(parent)

{
    //modify the port settings on your own
  port = new QextSerialPort("COM1");
  port->setBaudRate(BAUD19200);   
  port->setFlowControl(FLOW_OFF);
  port->setParity(PAR_NONE);    
  port->setDataBits(DATA_8);   
  port->setStopBits(STOP_2);    

  message = new QLineEdit(this);

  // transmit receive
  QPushButton *transmitButton = new QPushButton("Transmit");
  connect(transmitButton, SIGNAL(clicked()), SLOT(transmitMsg()));
  QPushButton *receiveButton = new QPushButton("Receive");
  connect(receiveButton, SIGNAL(clicked()), SLOT(receiveMsg()));
  QHBoxLayout* trLayout = new QHBoxLayout;
  trLayout->addWidget(transmitButton);
  trLayout->addWidget(receiveButton);
  
	//CR LF
  QPushButton *CRButton = new QPushButton("CR");
  connect(CRButton, SIGNAL(clicked()), SLOT(appendCR()));
  QPushButton *LFButton = new QPushButton("LF");
  connect(LFButton, SIGNAL(clicked()), SLOT(appendLF()));
  QHBoxLayout *crlfLayout = new QHBoxLayout;
  crlfLayout->addWidget(CRButton);
  crlfLayout->addWidget(LFButton);

	//open close
  QPushButton *openButton = new QPushButton("Open");
  connect(openButton, SIGNAL(clicked()), SLOT(openPort()));
  QPushButton *closeButton = new QPushButton("Close");
  connect(closeButton, SIGNAL(clicked()), SLOT(closePort()));
  QHBoxLayout *ocLayout = new QHBoxLayout;
  ocLayout->addWidget(openButton);
  ocLayout->addWidget(closeButton);

  received_msg = new QTextEdit();
  
  QVBoxLayout *myVBox = new QVBoxLayout;
  myVBox->addWidget(message);
  myVBox->addLayout(crlfLayout);
  myVBox->addLayout(trLayout);
  myVBox->addLayout(ocLayout);
  myVBox->addWidget(received_msg);
  setLayout(myVBox);

  qDebug("isOpen : %d", port->isOpen());
}

QespTest::~QespTest()
{
    delete port;
    port = NULL;
}

void QespTest::transmitMsg()
{
  int i = port->write((message->text()).toAscii(),
                       (message->text()).length());
  qDebug("trasmitted : %d", i);
}

void QespTest::receiveMsg()
{
	char buff[1024];
  	int numBytes;
  
	numBytes = port->bytesAvailable();
	if(numBytes > 0) 
	{
	    if(numBytes > 1024) numBytes = 1024;
	
	    int i = port->read(buff, numBytes);
		buff[i] = '\0';
	    QString msg = buff;
	
	   	received_msg->append(msg);
	   	received_msg->ensureCursorVisible();
		qDebug("bytes available: %d", numBytes);
		qDebug("received: %d", i);
  }
}


void QespTest::appendCR()
{
	message->insert("\x0D");
}

void QespTest::appendLF()
{
	message->insert("\x0A");
}

void QespTest::closePort()
{
	port->close();
	qDebug("is open: %d", port->isOpen());
}

void QespTest::openPort()
{
	port->open(QIODevice::ReadWrite);
	qDebug("is open: %d", port->isOpen());
}