qt-everywhere-src-5.15.1/qtserialport/examples/serialport/slave/slavethread.cpp

/****************************************************************************
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** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
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** This file is part of the QtSerialPort module of the Qt Toolkit.
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#include "slavethread.h"

#include <QtSerialPort/QSerialPort>

#include <QTime>

QT_USE_NAMESPACE

SlaveThread::SlaveThread(QObject *parent)
    : QThread(parent), waitTimeout(0), quit(false)
{
}

SlaveThread::~SlaveThread()
{
    mutex.lock();
    quit = true;
    mutex.unlock();
    wait();
}

void SlaveThread::startSlave(const QString &portName, int waitTimeout, const QString &response)
{
    QMutexLocker locker(&mutex);
    this->portName = portName;
    this->waitTimeout = waitTimeout;
    this->response = response;

    if (!isRunning())
        start();
}

void SlaveThread::run()
{
    bool currentPortNameChanged = false;

    mutex.lock();
    QString currentPortName;
    if (currentPortName != portName) {
        currentPortName = portName;
        currentPortNameChanged = true;
    }

    int currentWaitTimeout = waitTimeout;
    QString currentRespone = response;
    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.waitForReadyRead(currentWaitTimeout)) {

            // read all request
            QByteArray requestData = serial.readAll();
            while (serial.waitForReadyRead(10))
                requestData += serial.readAll();

            // write all response
            QByteArray responseData = currentRespone.toLocal8Bit();
            serial.write(responseData);
            if (serial.waitForBytesWritten(waitTimeout)) {
                QString request(requestData);
                emit this->request(request);
            } else {
                emit timeout(tr("Wait write response timeout %1")
                             .arg(QTime::currentTime().toString()));
            }
        } else {
            emit timeout(tr("Wait read request timeout %1")
                         .arg(QTime::currentTime().toString()));
        }

        mutex.lock();
        if (currentPortName != portName) {
            currentPortName = portName;
            currentPortNameChanged = true;
        } else {
            currentPortNameChanged = false;
        }
        currentWaitTimeout = waitTimeout;
        currentRespone = response;
        mutex.unlock();
    }
}