Added QtSerial to the project

Author: karlphillip

QtSerial/QtSerial.pro

@@ -0,0 +1,8 @@
+QT += core serialport
+
+SOURCES += \
+    main.cpp \
+    serialportreader.cpp
+
+HEADERS += \
+    serialportreader.h

QtSerial/main.cpp

@@ -0,0 +1,31 @@
+#include "serialportreader.h"
+#include <iostream>
+
+#include <QCoreApplication>
+#include <QtSerialPort/QSerialPort>
+
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication coreApplication(argc, argv);
+
+    QSerialPort serial;
+    QString port("COM6");
+    serial.setPortName(port);
+    serial.setBaudRate(QSerialPort::Baud9600);
+    serial.setDataBits(QSerialPort::Data8);
+    serial.setStopBits(QSerialPort::OneStop);
+    serial.setParity(QSerialPort::NoParity);
+    serial.setFlowControl(QSerialPort::NoFlowControl);
+
+    if (!serial.open(QIODevice::ReadOnly))
+    {
+        std::cout << "!!! Failed to open port " << port.toStdString() <<
+                     ". Error: " << serial.errorString().toStdString() << std::endl;
+        return 1;
+    }
+
+    SerialPortReader reader(&serial);
+
+    return coreApplication.exec();
+}

QtSerial/serialportreader.cpp

@@ -0,0 +1,55 @@
+#include "serialportreader.h"
+#include <iostream>
+
+#include <QCoreApplication>
+#include <QDebug>
+
+
+SerialPortReader::SerialPortReader(QSerialPort* serial, QObject* parent)
+: QObject(parent), _serial(serial)
+{
+    // The magic call that makes QSerialPort outputs from a serial connected with Arduino
+    _serial->setDataTerminalReady(true);
+
+    QObject::connect(_serial, SIGNAL(readyRead()),
+                     SLOT(_read_callback()));
+
+    QObject::connect(_serial, SIGNAL(error(QSerialPort::SerialPortError)),
+                     SLOT(_error_callback(QSerialPort::SerialPortError)));
+}
+
+SerialPortReader::~SerialPortReader()
+{
+}
+
+void SerialPortReader::_read_callback()
+{
+    if (!_serial)
+        return;
+
+    QByteArray data = _serial->readAll();
+    int sz = data.size();
+
+    /* On my Arduino data is always 3 bytes:
+     *  data[0]: is the value I'm interested at
+     *  data[1]: is always 13 (carriage return)
+     *  data[2]: is always 10 (new line)
+     *
+     * which causes std::cout to jump 2 lines, and I find it annoying,
+     * hence the *if* statement below just to print the value I need.
+     */
+    if (sz == 3 && (int)data[1] == 13 && (int)data[2] == 10)
+        std::cout << data[0] << std::endl;
+    else
+        std::cout << data.toStdString() << std::endl;
+}
+
+void SerialPortReader::_error_callback(QSerialPort::SerialPortError error)
+{
+    if (error == QSerialPort::ReadError)
+    {
+        std::cout << "!!! An I/O error occurred while reading the data from port " << _serial->portName().toStdString() <<
+                     ". Error: " << _serial->errorString().toStdString() << std::endl;
+        QCoreApplication::exit(1);
+    }
+}

QtSerial/serialportreader.h

@@ -0,0 +1,21 @@
+#pragma once
+#include <QByteArray>
+#include <QObject>
+#include <QtSerialPort/QSerialPort>
+
+
+class SerialPortReader : public QObject
+{
+    Q_OBJECT
+
+public:
+    SerialPortReader(QSerialPort* serial, QObject* parent = 0);
+    ~SerialPortReader();
+
+private slots:
+    void _read_callback();
+    void _error_callback(QSerialPort::SerialPortError error);
+
+private:
+    QSerialPort* _serial;
+};

README.md

@@ -35,3 +35,7 @@ http://blog.sklambert.com/using-time-based-animation-implement/
 cvWatershedSegmentation
 --------------
 A simple watershed segmentation example using distance transform to segment beans.
+
+QtSerial
+--------------
+An application that prints data from a serial (COM) port connected to an Arduino.