Revision control
++ // 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
++ // Qt-Security score:significant reason:default
++
++ #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