WiringPi for Qt

WiringPi: An implementation of most of the Arduino Wiring functions for the Raspberry Pi.

WiringPi-Qt : Adding Qt Signals & Slots to WiringPi.

Setup

1. copy WiringPi-Qt folder to your project
2. go to .pro file of your project and add at the end those lines

INCLUDEPATH += $$PWD/WiringPi-Qt
include(WiringPi-Qt/WiringPi-Qt.pri)

Examples

https://github.com/salim97/WiringPi-Qt/tree/master/Examples

#include <QObject>
#include "wiringPi-Qt.h"

class MyGPIO : public QObject
{
    Q_OBJECT

public:
    explicit MyGPIO(QObject *parent = 0);

    CONVERT_CLASS_INTO_SINGELTON(MyGPIO)

    INPUT_GPIO_PROPERTY(button1,     7,  INT_EDGE_BOTH, PUD_DOWN)
    
    OUTPUT_GPIO_PROPERTY(led_green, 23)

};

Usage

open terminal and run

$ gpio readall

wPInumberPIN represent wPi number in the table

OUTPUT_GPIO_PROPERTY(NAME, wPInumberPIN)

to specifie pin as an output

INPUT_GPIO_PROPERTY(NAME, wPInumberPIN, INT_MODE, PUD_MODE)

to specifie pin as an input INT_MODE : INT_EDGE_FALLING, INT_EDGE_RISING, INT_EDGE_BOTH, INT_EDGE_SETUP . PUD_MODE: PUD_UP, PUD_DOWN, PUD_OFF

check this site for more information : http://wiringpi.com/reference/priority-interrupts-and-threads/

Details about requirement in order to work proprely

header

1. the class must inherite from QObject and contain the Q_OBJECT macro in it
2. add CONVERT_CLASS_INTO_SINGELTON() macro in order to be singelton, and class name in paramter
3. use INPUT_GPIO_PROPERTY and OUTPUT_GPIO_PROPERTY as much as you can

#include <QObject>
#include "wiringPi-Qt.h"

class MyGPIO : public QObject
{
    Q_OBJECT

public:
    explicit MyGPIO(QObject *parent = 0);

    CONVERT_CLASS_INTO_SINGELTON(MyGPIO)

    INPUT_GPIO_PROPERTY(button1,     7,  INT_EDGE_BOTH, PUD_DOWN)
    
    OUTPUT_GPIO_PROPERTY(led_green, 23)

};

source

1. add this above contrecteur

MyGPIO* MyGPIO::m_MyGPIO = 0;

2. add CALL_THIS_IN_CONSTRACTEUR_FOR_INPUT_OUTPUT_GPIO in contrecteur

MyGPIO* MyGPIO::m_MyGPIO = 0;

MyGPIO::MyGPIO(QObject *parent) : QObject(parent)
{
    CALL_THIS_IN_CONSTRACTEUR_FOR_INPUT_OUTPUT_GPIO

}

How it work inside

in this library we are using call back function to update value of prorety each time state of gpio changed using wiringPiISR function

i used macro to reduce writing code

i used singelton design pattern dude to issue that i had with wiringPiISR function when passing a static function the static function can't call other methods without a pointer to the class, with singelton you can get pointer of the class at any giving time and the class it will be singel in the whole programme so no issue of double declaration example : MyGPIO::getInstance() ; // to get pointer of class MyGPIO

i used c++ meta class to call somefunction in run time like __init to initialize the pin