Reading a serial PORT for data extraction

Question

I have written a program that reads data through a serial port.

I always get the following comment when I run my program:"Error, Uknown error".

I work on an IMU sensor, I tested it with Termite (software for reading data from serial port) to see if I receive the data, and indeed the sensor is functional and I receive the data perfectly through Termite.

On the other hand under linux, if I make the command cat /dev/ttyACM0, I receive the data only during 10 s, from where the decision to write a code

    Imu::Imu() :
        moving(false)
    {

        serialPort = new QSerialPort("COM3",this);

        if (serialPort->open( QIODevice::ReadOnly))
        {
      
            qDebug()<<"SerialPort"<<serialPort<<"Opened successufly";
        }
        else
        {
            qDebug()<<serialPort->error();
            QSerialPortInfo::availablePorts();
        }

        if (!serialPort->setBaudRate(57600))
            log_error("imu","failed to set baudrate, error no %d",serialPort->error());
        serialPort->setDataBits(QSerialPort::Data8);
        serialPort->setParity(QSerialPort::NoParity);
        serialPort->setStopBits(QSerialPort::OneStop); // One Stop bit
        serialPort->setFlowControl(QSerialPort::NoFlowControl);
        qDebug()<<"error"<<serialPort->errorString();

        pollingTimer = new QTimer(this);
        //QObject::connect(this->serialPort,SIGNAL(readyRead()),this,SLOT(pollSerialPort()));
        QObject::connect(pollingTimer, SIGNAL(timeout()), this, SLOT(pollSerialPort()));
        QObject::connect(serialPort, &::QSerialPort::errorOccurred,this,&Imu::handleError);
        pollingTimer->start(10);
        }

    Imu::~Imu()
    {
       serialPort->close();
    }

    void Imu::handleError(QSerialPort::SerialPortError error)
    {
        if (error == QSerialPort::ResourceError){
            qDebug()<<"Handle Error"<<error;
        }
    }

Ps : I sent the code to a friend to see if it is correct, he tested it and he received the data

Answer 1

不要轮询计时器，而是将 QSerialPort::readyRead 连接到一个插槽，并在插槽内使用 QSerialPort::readAll() 直到 QSerialPort::bytesAvailable() 为 0。