QT 串口操作
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QT 下串口操作
参考代码如下;
#include "serialport.h"
#include<QDebug>
#define MAX_RECV_LENGTH 1024
SerialPort::SerialPort(QWidget *parent):
QObject(parent)
{
m_fd=-1;
rev_buf=new QByteArray();
m_iRecvLength=0;
rec_data=new unsigned char[MAX_RECV_LENGTH+1];
}
//open
bool SerialPort::openPort(QString portName, BaudRateType baundRate, DataBitsType dataBits,
ParityType parity, StopBitsType stopBits, FlowType flow, int time_out)
{
if(m_fd!=-1)
{
qDebug("is aready opened!");
return false;
}
rev_buf->clear();
memset(&new_serialArry,0,sizeof new_serialArry);
m_fd=::open(portName.toLatin1(),O_RDWR|O_NONBLOCK);
if( m_fd==-1)
{
qDebug("serial port open erro!");
return false;
}
switch(baundRate)
{
case BAUD75:
new_serialArry.c_cflag |= B75;
break;
case BAUD110:
new_serialArry.c_cflag |= B110;
break;
case BAUD300:
new_serialArry.c_cflag |= B300;
break;
case BAUD600:
new_serialArry.c_cflag |= B600;
break;
case BAUD1200:
new_serialArry.c_cflag |= B1200;
break;
case BAUD2400:
new_serialArry.c_cflag |= B2400;
break;
case BAUD4800:
new_serialArry.c_cflag |= B4800;
break;
case BAUD9600:
new_serialArry.c_cflag |= B9600;
break;
case BAUD19200:
new_serialArry.c_cflag |= B19200;
break;
case BAUD38400:
new_serialArry.c_cflag |= B38400;
break;
case BAUD57600:
new_serialArry.c_cflag |= B57600;
break;
case BAUD115200:
new_serialArry.c_cflag |= B115200;
break;
default:
new_serialArry.c_cflag |= B9600;
break;
}
switch(dataBits)
{
case DATA_5:
new_serialArry.c_cflag|=CS5;
break;
case DATA_6:
new_serialArry.c_cflag|=CS6;
break;
case DATA_7:
new_serialArry.c_cflag|=CS7;
break;
case DATA_8:
new_serialArry.c_cflag|=CS8;
break;
default:
new_serialArry.c_cflag|=CS8;
break;
}
switch (parity)
{
case PAR_NONE:
new_serialArry.c_cflag &= (~PARENB);
break;
case PAR_EVEN:
new_serialArry.c_cflag &= (~PARODD);
new_serialArry.c_cflag |= PARENB;
break;
case PAR_ODD:
new_serialArry.c_cflag |= (PARODD|PARENB);
break;
default:
break;
}
switch(stopBits)
{
case STOP_1:
new_serialArry.c_cflag &=(~CSTOPB);
break;
case STOP_1_5:
break;
case STOP_2:
new_serialArry.c_cflag |=CSTOPB;
break;
default:
new_serialArry.c_cflag &=(~CSTOPB);
break;
}
switch(flow)
{
case FLOW_OFF:
new_serialArry.c_cflag &=(~CRTSCTS);
new_serialArry.c_iflag &=(~(IXON|IXOFF|IXANY));
break;
case FLOW_XONXOFF:
new_serialArry.c_cflag &=(~CRTSCTS);
new_serialArry.c_iflag |=(IXON|IXOFF|IXANY);
break;
case FLOW_HARDWARE:
new_serialArry.c_cflag |=~CRTSCTS;
new_serialArry.c_iflag &=(~(IXON|IXOFF|IXANY));
break;
default:
break;
}
new_serialArry.c_oflag=0;
new_serialArry.c_cc[VTIME]=time_out/100;
tcflush(m_fd,TCIFLUSH);
tcsetattr(m_fd,TCSANOW,&new_serialArry);
m_notifier= new QSocketNotifier(m_fd,QSocketNotifier::Read,0);
connect(m_notifier,SIGNAL(activated(int)),this,SLOT(remoteDateInComing()));
return true;
}
//close
bool SerialPort::close()
{
mutex_r.lock();
if(m_fd!=-1)
{
disconnect(m_notifier,SIGNAL(activated(int)),this,SLOT(remoteDateInComing()));
delete m_notifier;
m_fd=-1;
mutex_r.unlock();
return true;
}
mutex_r.unlock();
return false;
}
//recive data
unsigned char c[1024];
void SerialPort::remoteDateInComing()
{
int n= ::read(m_fd,&c,sizeof c);
mutex_r.lock();
if( (n+m_iRecvLength) <= MAX_RECV_LENGTH )
{
memcpy((unsigned char *)&rec_data[m_iRecvLength],c,n);
m_iRecvLength+=n;
}
/*for(int i=0;i<m_iRecvLength;i++)
{
printf("rec_data[i]=%x__ ",rec_data[i]);
}
printf("\n");*/
mutex_r.unlock();
emit hasdata();
}
//write data
/*int SerialPort::write(QByteArray buf)
{
mutex_r.lock();
int ret;
ret=0;
if(m_fd!=-1)
{
ret= :: write(m_fd,buf.data(),buf.length());
}
mutex_r.unlock();
return ret;
}*/
int SerialPort::write(unsigned char *buf,int length)
{
mutex_r.lock();
int ret;
ret=0;
if(m_fd!=-1)
{
ret= :: write(m_fd,buf,length);
printf("Send ret =%d length=%d buf[0]=%x \n",ret,length,buf[0]);
}
mutex_r.unlock();
return ret;
}
unsigned char retByteArray[MAX_RECV_LENGTH+1];
unsigned char *SerialPort::read(int &iLength)
{
mutex_r.lock();
memcpy( retByteArray ,rec_data,m_iRecvLength);
mutex_r.unlock();
iLength=m_iRecvLength;
m_iRecvLength=0;
return retByteArray;
}
/*
QByteArray SerialPort::read()
{
mutex_r.lock();
QByteArray retByteArray;
if(rev_buf->isEmpty())
{
retByteArray.append("aaa");
retByteArray.clear();
}else
{
retByteArray.append(rev_buf->data());
rev_buf->clear();
}
mutex_r.unlock();
return retByteArray;
}*/
参考代码如下;
#include "serialport.h"
#include<QDebug>
#define MAX_RECV_LENGTH 1024
SerialPort::SerialPort(QWidget *parent):
QObject(parent)
{
m_fd=-1;
rev_buf=new QByteArray();
m_iRecvLength=0;
rec_data=new unsigned char[MAX_RECV_LENGTH+1];
}
//open
bool SerialPort::openPort(QString portName, BaudRateType baundRate, DataBitsType dataBits,
ParityType parity, StopBitsType stopBits, FlowType flow, int time_out)
{
if(m_fd!=-1)
{
qDebug("is aready opened!");
return false;
}
rev_buf->clear();
memset(&new_serialArry,0,sizeof new_serialArry);
m_fd=::open(portName.toLatin1(),O_RDWR|O_NONBLOCK);
if( m_fd==-1)
{
qDebug("serial port open erro!");
return false;
}
switch(baundRate)
{
case BAUD75:
new_serialArry.c_cflag |= B75;
break;
case BAUD110:
new_serialArry.c_cflag |= B110;
break;
case BAUD300:
new_serialArry.c_cflag |= B300;
break;
case BAUD600:
new_serialArry.c_cflag |= B600;
break;
case BAUD1200:
new_serialArry.c_cflag |= B1200;
break;
case BAUD2400:
new_serialArry.c_cflag |= B2400;
break;
case BAUD4800:
new_serialArry.c_cflag |= B4800;
break;
case BAUD9600:
new_serialArry.c_cflag |= B9600;
break;
case BAUD19200:
new_serialArry.c_cflag |= B19200;
break;
case BAUD38400:
new_serialArry.c_cflag |= B38400;
break;
case BAUD57600:
new_serialArry.c_cflag |= B57600;
break;
case BAUD115200:
new_serialArry.c_cflag |= B115200;
break;
default:
new_serialArry.c_cflag |= B9600;
break;
}
switch(dataBits)
{
case DATA_5:
new_serialArry.c_cflag|=CS5;
break;
case DATA_6:
new_serialArry.c_cflag|=CS6;
break;
case DATA_7:
new_serialArry.c_cflag|=CS7;
break;
case DATA_8:
new_serialArry.c_cflag|=CS8;
break;
default:
new_serialArry.c_cflag|=CS8;
break;
}
switch (parity)
{
case PAR_NONE:
new_serialArry.c_cflag &= (~PARENB);
break;
case PAR_EVEN:
new_serialArry.c_cflag &= (~PARODD);
new_serialArry.c_cflag |= PARENB;
break;
case PAR_ODD:
new_serialArry.c_cflag |= (PARODD|PARENB);
break;
default:
break;
}
switch(stopBits)
{
case STOP_1:
new_serialArry.c_cflag &=(~CSTOPB);
break;
case STOP_1_5:
break;
case STOP_2:
new_serialArry.c_cflag |=CSTOPB;
break;
default:
new_serialArry.c_cflag &=(~CSTOPB);
break;
}
switch(flow)
{
case FLOW_OFF:
new_serialArry.c_cflag &=(~CRTSCTS);
new_serialArry.c_iflag &=(~(IXON|IXOFF|IXANY));
break;
case FLOW_XONXOFF:
new_serialArry.c_cflag &=(~CRTSCTS);
new_serialArry.c_iflag |=(IXON|IXOFF|IXANY);
break;
case FLOW_HARDWARE:
new_serialArry.c_cflag |=~CRTSCTS;
new_serialArry.c_iflag &=(~(IXON|IXOFF|IXANY));
break;
default:
break;
}
new_serialArry.c_oflag=0;
new_serialArry.c_cc[VTIME]=time_out/100;
tcflush(m_fd,TCIFLUSH);
tcsetattr(m_fd,TCSANOW,&new_serialArry);
m_notifier= new QSocketNotifier(m_fd,QSocketNotifier::Read,0);
connect(m_notifier,SIGNAL(activated(int)),this,SLOT(remoteDateInComing()));
return true;
}
//close
bool SerialPort::close()
{
mutex_r.lock();
if(m_fd!=-1)
{
disconnect(m_notifier,SIGNAL(activated(int)),this,SLOT(remoteDateInComing()));
delete m_notifier;
m_fd=-1;
mutex_r.unlock();
return true;
}
mutex_r.unlock();
return false;
}
//recive data
unsigned char c[1024];
void SerialPort::remoteDateInComing()
{
int n= ::read(m_fd,&c,sizeof c);
mutex_r.lock();
if( (n+m_iRecvLength) <= MAX_RECV_LENGTH )
{
memcpy((unsigned char *)&rec_data[m_iRecvLength],c,n);
m_iRecvLength+=n;
}
/*for(int i=0;i<m_iRecvLength;i++)
{
printf("rec_data[i]=%x__ ",rec_data[i]);
}
printf("\n");*/
mutex_r.unlock();
emit hasdata();
}
//write data
/*int SerialPort::write(QByteArray buf)
{
mutex_r.lock();
int ret;
ret=0;
if(m_fd!=-1)
{
ret= :: write(m_fd,buf.data(),buf.length());
}
mutex_r.unlock();
return ret;
}*/
int SerialPort::write(unsigned char *buf,int length)
{
mutex_r.lock();
int ret;
ret=0;
if(m_fd!=-1)
{
ret= :: write(m_fd,buf,length);
printf("Send ret =%d length=%d buf[0]=%x \n",ret,length,buf[0]);
}
mutex_r.unlock();
return ret;
}
unsigned char retByteArray[MAX_RECV_LENGTH+1];
unsigned char *SerialPort::read(int &iLength)
{
mutex_r.lock();
memcpy( retByteArray ,rec_data,m_iRecvLength);
mutex_r.unlock();
iLength=m_iRecvLength;
m_iRecvLength=0;
return retByteArray;
}
/*
QByteArray SerialPort::read()
{
mutex_r.lock();
QByteArray retByteArray;
if(rev_buf->isEmpty())
{
retByteArray.append("aaa");
retByteArray.clear();
}else
{
retByteArray.append(rev_buf->data());
rev_buf->clear();
}
mutex_r.unlock();
return retByteArray;
}*/
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