头文件
#include "InsScpi.h"
#include <QObject>
#include <QSerialPort>class TestSerial : public QObject
{Q_OBJECT
public:explicit TestSerial(QObject *parent = nullptr);//打开设备bool openDevice(const QString &portName);//关闭设备void closeDevice();//发送数据bool write(const char* cmd, qint64 maxSize);//-- 获取温度 //-- 返回字符串格式://-- "22.3408 22.7402 24.3184 24.6043"QString getTemp(bool& ok, int msec = 500);signals:void sig_finishReadSerial(); //完成串口读取信号private:void init(); //初始化函数private:QSerialPort* m_serialPort = nullptr; //串口QString m_portName = "COM1"; //串口号//串口描述信息using QtSP = QSerialPort;QtSP::BaudRate m_baudRate = QtSP::Baud115200; //波特率QtSP::DataBits m_dataBits = QtSP::Data8; //数据位长度QtSP::Parity m_parity = QtSP::NoParity; //校验位QtSP::StopBits m_stopBits = QtSP::OneStop; //停止位
};
实现
#include <QDebug>
#include <QEventLoop>
#include <QTimer>TestSerial::TestSerial( QObject *parent): QObject{parent}
{(void)init();
}void TestSerial::init()
{//[1] 实例化串口对象if (!m_serialPort){m_serialPort = new QSerialPort();}
}bool TestSerial::openDevice(const QString &portName)
{//[1] 判断串口对象是否实例化if (!m_serialPort){qDebug() << "serial obj is null";return false;}//[2] 判断串口是否已经打开if (m_serialPort->isOpen()){qDebug() << "device is already open";return false;}//[3] 设置串口信息m_portName = portName;m_serialPort->setPortName(m_portName);m_serialPort->setBaudRate(m_baudRate, QSerialPort::AllDirections);m_serialPort->setDataBits(m_dataBits);m_serialPort->setParity(m_parity);m_serialPort->setStopBits(m_stopBits);m_serialPort->setFlowControl(QSerialPort::NoFlowControl);//[4] 打开串口return m_serialPort->open(QIODevice::ReadWrite);
}void TestSerial::closeDevice()
{//[1] 判断串口对象是否实例化if (!m_serialPort){qDebug() << "serial obj is null";return;}//[2] 关闭串口m_serialPort->close();
}bool TestSerial::write(const char *cmd, qint64 maxSize)
{//[1] 判断串口对象是否实例化if (!m_serialPort){qDebug() << "serial obj is null";return false;}//[2] 判断串口是否打开if (!m_serialPort->isOpen()){qDebug() << "serial is not open";return false;}//[3] 发送数据if(maxSize != m_serialPort->write(cmd, maxSize)){qDebug() << "send serial data failed";return false;}return true;
}//-- 获取温度
//-- 返回字符串格式:
//-- "22.3408 22.7402 24.3184 24.6043"
QString TestSerial::getTemp(bool& ok, int msec)
{static QString ret;ret.clear();if (!m_serialPort){qDebug() << "serial obj is null";return "";}QEventLoop loop;QObject::connect(this, &TestSerial::sig_finishReadSerial, &loop, &QEventLoop::quit);QTimer::singleShot(msec, this, [&]{ emit sig_finishReadSerial(); });QByteArray cmdBa = "getTemp()";m_serialPort->clear();if(0 != cmdBa.size()) {if(cmdBa.size() == m_serialPort->write(cmdBa)) ok = true;else ok = false;}auto async = QObject::connect(m_serialPort, &QSerialPort::readyRead, [&]() {auto rcvData = m_serialPort->readAll();ret = QString::fromLatin1(rcvData);emit sig_finishReadSerial();});loop.exec();QObject::disconnect(async);return ret;
}
