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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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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