/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *                                                                         *
 *  This file is part of guh.                                              *
 *                                                                         *
 *  Guh is free software: you can redistribute it and/or modify            *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation, version 2 of the License.                *
 *                                                                         *
 *  Guh is distributed in the hope that it will be useful,                 *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *  You should have received a copy of the GNU General Public License      *
 *  along with guh. If not, see <http://www.gnu.org/licenses/>.            *
 *                                                                         *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef GPIO_H
#define GPIO_H

#include <QObject>
#include <QThread>
#include <QMutex>
#include <QMutexLocker>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>

#define     INPUT   0
#define     OUTPUT  1
#define     LOW     0
#define     HIGH    1

#define     EDGE_FALLING    0
#define     EDGE_RISING     1
#define     EDGE_BOTH       2

/**********************************
 *   ______________________
 *  |______________________|
 *  |  File NR. |  PIN NR. |
 *  |___________|__________|
 *  |  GPIO 2   |   3      |
 *  |  GPIO 3   |   5      |
 *  |  GPIO 4   |   7      |
 *  |  GPIO 7   |   26     |
 *  |  GPIO 8   |   24     |
 *  |  GPIO 9   |   21     |
 *  |  GPIO 10  |   19     |
 *  |  GPIO 11  |   23     |
 *  |  GPIO 14  |   8      |
 *  |  GPIO 15  |   10     |
 *  |  GPIO 17  |   11     |
 *  |  GPIO 18  |   12     |
 *  |  GPIO 22  |   15     |
 *  |  GPIO 23  |   16     |
 *  |  GPIO 24  |   18     |
 *  |  GPIO 25  |   22     |
 *  |  GPIO 27  |   13     |
 *  |___________|__________|
 *
 **********************************
 */

class Gpio : public QThread
{
    Q_OBJECT
public:
    explicit Gpio(QObject *parent = 0, int gpio = 0);
    ~Gpio();

    void run() override;

    bool exportGpio();
    bool unexportGpio();

    int openGpio();
    bool setDirection(int dir);

    bool setValue(unsigned int value);
    int getValue();

    bool setEdgeInterrupt(int edge);
    void stop();

private:
    int m_gpio;
    int m_dir;
    QMutex m_mutex;
    bool m_enabled;

signals:
    /*! This signal is emited if the INPUT value changed, depending on the edge set in \l{setEdgeInterrupt}*/
    void pinInterrupt();

public slots:

};

#endif // GPIO_H