masterthread.cpp Example File
blockingmaster/masterthread.cpp
#include "masterthread.h"
#include <QtSerialPort/QSerialPort>
#include <QTime>
QT_USE_NAMESPACE
MasterThread::MasterThread(QObject *parent)
: QThread(parent), waitTimeout(0), quit(false)
{
}
MasterThread::~MasterThread()
{
mutex.lock();
quit = true;
cond.wakeOne();
mutex.unlock();
wait();
}
void MasterThread::transaction(const QString &portName, int waitTimeout, const QString &request)
{
QMutexLocker locker(&mutex);
this->portName = portName;
this->waitTimeout = waitTimeout;
this->request = request;
if (!isRunning())
start();
else
cond.wakeOne();
}
void MasterThread::run()
{
bool currentPortNameChanged = false;
mutex.lock();
QString currentPortName;
if (currentPortName != portName) {
currentPortName = portName;
currentPortNameChanged = true;
}
int currentWaitTimeout = waitTimeout;
QString currentRequest = request;
mutex.unlock();
QSerialPort serial;
while (!quit) {
if (currentPortNameChanged) {
serial.close();
serial.setPortName(currentPortName);
if (!serial.open(QIODevice::ReadWrite)) {
emit error(tr("Can't open %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
if (!serial.setBaudRate(QSerialPort::Baud9600)) {
emit error(tr("Can't set baud rate 9600 baud to port %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
if (!serial.setDataBits(QSerialPort::Data8)) {
emit error(tr("Can't set 8 data bits to port %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
if (!serial.setParity(QSerialPort::NoParity)) {
emit error(tr("Can't set no patity to port %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
if (!serial.setStopBits(QSerialPort::OneStop)) {
emit error(tr("Can't set 1 stop bit to port %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
if (!serial.setFlowControl(QSerialPort::NoFlowControl)) {
emit error(tr("Can't set no flow control to port %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
}
QByteArray requestData = currentRequest.toLocal8Bit();
serial.write(requestData);
if (serial.waitForBytesWritten(waitTimeout)) {
if (serial.waitForReadyRead(currentWaitTimeout)) {
QByteArray responseData = serial.readAll();
while (serial.waitForReadyRead(10))
responseData += serial.readAll();
QString response(responseData);
emit this->response(response);
} else {
emit timeout(tr("Wait read response timeout %1")
.arg(QTime::currentTime().toString()));
}
} else {
emit timeout(tr("Wait write request timeout %1")
.arg(QTime::currentTime().toString()));
}
mutex.lock();
cond.wait(&mutex);
if (currentPortName != portName) {
currentPortName = portName;
currentPortNameChanged = true;
} else {
currentPortNameChanged = false;
}
currentWaitTimeout = waitTimeout;
currentRequest = request;
mutex.unlock();
}
}