无法使用qtserial将数据写入Arduino

我对qt编程相当陌生。我无法向Arduino发送/写入数据。无法使用qtserial将数据写入Arduino

预计将从Arduino中读取数据。

我想打开pin13导致当Serial.available() > 0。当我使用Arduino串行监视器发送数据时，它可以工作。但我不能用qt-serial做同样的事情。我没有收到任何错误消息。

应该采取什么方法来调试这些问题？

serialCom.h

#ifndef SERIALCOM_H 
#define SERIALCOM_H 

#include <QObject> 
#include <QSerialPort> 

class SerialCom: public QObject 
{ 
    Q_OBJECT 
public: 
    SerialCom(QObject *parent = 0); 
    ~SerialCom(); 
    void openSerialPort(); 
    void closeSerialPort(); 
    void writeData(const QByteArray &data);  
public slots: 
    void handleError(QSerialPort::SerialPortError error); 
    void readData(); 
private: 
    QSerialPort *serial; 
}; 

#endif // SERIALCOM_H

serialCom.cpp

#include "serialcom.h" 
#include <QDebug> 
#include <QSerialPortInfo> 

SerialCom::SerialCom(QObject *parent): 
    QObject(parent) 
{ 
    serial = new QSerialPort(this); 

    connect(serial, SIGNAL(error(QSerialPort::SerialPortError)), this, 
      SLOT(handleError(QSerialPort::SerialPortError))); 
    connect(serial, SIGNAL(readyRead()), this, SLOT(readData())); 
} 

SerialCom::~SerialCom() 
{ 

} 

void SerialCom::openSerialPort() 
{ 
    QSerialPortInfo portToUse; 
    foreach (const QSerialPortInfo &port, QSerialPortInfo::availablePorts()) { 

     if(port.isNull() || !port.isValid()) 
     { 
      qDebug() << "port is not valid:" << port.portName(); 
      return; 
     } 
     if(!port.isBusy() && port.manufacturer().contains("Arduino")){ 
      portToUse = port; 
      qDebug() << tr("Port: %1 || manufacurer: %2").arg(port.portName()).arg(port.manufacturer()); 
     } else { 
      qDebug() << "either port is busy or its not arduino"; 
     } 
    }//forEach 

    serial->setPortName(portToUse.portName()); 
    serial->setBaudRate(QSerialPort::Baud9600); 
    serial->setDataBits(QSerialPort::Data8); 
    serial->setParity(QSerialPort::NoParity); 
    serial->setStopBits(QSerialPort::OneStop); 
    serial->setFlowControl(QSerialPort::NoFlowControl); 
    if (serial->open(QIODevice::ReadWrite)) { 
     qDebug() << "Connected to" << portToUse.description() << "on" << portToUse.portName(); 
    } else { 
     qCritical() << "Serial Port error:" << serial->errorString(); 

     qDebug() << tr("Open error"); 
    } 
} 

void SerialCom::writeData(const QByteArray &data) 
{ 
    if(serial->isOpen() && serial->isWritable()){ 
     serial->write(data); 
     serial->flush(); 
     qDebug() << "Writing: " << data; 
    }else{ 
     qDebug() << "port not ready to write:" << serial->isWritable(); 
    } 
} 

void SerialCom::readData() 
{ 
    QByteArray data = serial->readAll(); 
    qDebug() << "UART:" << data; 
} 

void SerialCom::handleError(QSerialPort::SerialPortError error) 
{ 
    qDebug() << error; 
} 

void SerialCom::closeSerialPort() 
{ 
    serial->close(); 
    qDebug() << tr("Disconnected"); 
}

的main.cpp

#include <QCoreApplication> 
#include "serialcom.h" 

int main(int argc, char *argv[]) 
{ 
    QCoreApplication a(argc, argv); 
    SerialCom serialCom; 

    //open port 
    serialCom.openSerialPort(); 


    //make some stupid data to write to the serial port for testing 
    const QByteArray stupid_data = "Hello World"; 


    //write @stupid_data to serial port 
    serialCom.writeData(stupid_data); 

    //closing port 
// serialCom.closeSerialPort(); 

    return a.exec(); 
}

simpleSerialCom.pro

QT += core serialport 
QT -= gui 

TARGET = simpleSerialCom 
CONFIG += console 
CONFIG -= app_bundle 

TEMPLATE = app 

SOURCES += main.cpp \ 
    serialcom.cpp 

HEADERS += \ 
    serialcom.h

来源

2016-02-09 Praveen Singh Yadav