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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSerialBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMODBUSDEVICE_P_H
#define QMODBUSDEVICE_P_H
#include <QtCore/qvariant.h>
#include <QtSerialBus/qmodbusdevice.h>
#if QT_CONFIG(modbus_serialport)
#include <QtSerialPort/qserialport.h>
#endif
#include <private/qobject_p.h>
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_BEGIN_NAMESPACE
class QModbusDevicePrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QModbusDevice)
public:
QModbusDevice::State state = QModbusDevice::UnconnectedState;
QModbusDevice::Error error = QModbusDevice::NoError;
QString errorString;
#if QT_CONFIG(modbus_serialport)
QString m_comPort;
QSerialPort::DataBits m_dataBits = QSerialPort::Data8;
QSerialPort::Parity m_parity = QSerialPort::EvenParity;
QSerialPort::StopBits m_stopBits = QSerialPort::OneStop;
QSerialPort::BaudRate m_baudRate = QSerialPort::Baud19200;
/*!
According to the Modbus specification, in RTU mode message frames
are separated by a silent interval of at least 3.5 character times.
Calculate the timeout if we are less than 19200 baud, use a fixed
timeout for everything equal or greater than 19200 baud.
If the user set the timeout to be longer than the calculated one,
we'll keep the user defined.
*/
void calculateInterFrameDelay()
{
// The spec recommends a timeout value of 1.750 msec. Without such
// precise single-shot timers use a approximated value of 1.750 msec.
int delayMilliSeconds = RecommendedDelay;
if (m_baudRate < 19200) {
// Example: 9600 baud, 11 bit per packet -> 872 char/sec so:
// 1000 ms / 872 char = 1.147 ms/char * 3.5 character = 4.0145 ms
// Always round up because the spec requests at least 3.5 char.
delayMilliSeconds = qCeil(3500. / (qreal(m_baudRate) / 11.));
}
m_interFrameDelayMilliseconds = qMax(m_interFrameDelayMilliseconds, delayMilliSeconds);
}
static constexpr int RecommendedDelay = 2; // A approximated value of 1.750 msec.
int m_interFrameDelayMilliseconds = RecommendedDelay;
#endif
int m_networkPort = 502;
QString m_networkAddress = QStringLiteral("127.0.0.1");
virtual QIODevice *device() const { return nullptr; }
};
QT_END_NAMESPACE
#endif // QMODBUSDEVICE_P_H
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