rotaryencoder.cpp

#include "rotaryencoder.h"

int rotaryencoder::counterValue;
bool rotaryencoder::A_set;
bool rotaryencoder::B_set;

rotaryencoder::rotaryencoder(int _a, int _b) {

    encoderPinA = _a;
    encoderPinB = _b;
    
    pinMode(encoderPinA, INPUT);
    pinMode(encoderPinB, INPUT);
    
    pullUpDnControl(encoderPinA, PUD_UP);
    pullUpDnControl(encoderPinB, PUD_UP);
    
    if ( wiringPiISR (encoderPinA,INT_EDGE_BOTH, &handleInterrupt) < 0 ) {
     //   ofLog()<<"Unable to setup encoderPinA ISR";
    }
    if ( wiringPiISR (encoderPinB,INT_EDGE_BOTH, &handleInterrupt) < 0 ) {
      //  ofLog()<<"Unable to setup encoderPinB ISR";
    }

    
 
}

void rotaryencoder::update(){
    wrappedCounter = 0;
    if(counterValue < 0 ) wrappedCounter = linesPerRevolution + counterValue;
    else wrappedCounter = counterValue;
    encoderPosition = (int)ofMap(wrappedCounter,0,linesPerRevolution,0,2400); //1200 = (60 frames per sec) * (20 sec per 360 degrees)

}

void rotaryencoder::handleInterrupt() {

    rotaryencoder::A_set = digitalRead(0) == HIGH;
    rotaryencoder::counterValue += (rotaryencoder::A_set == rotaryencoder::B_set) ? +1 : -1;
    
    rotaryencoder::B_set = digitalRead(7) == HIGH;
    rotaryencoder::counterValue += (rotaryencoder::A_set != rotaryencoder::B_set) ? +1 : -1;

    rotaryencoder::counterValue = rotaryencoder::counterValue % linesPerRevolution; //keeps the counter between -9600 and 9600
}

rotaryencoder.h

//http://www.disk91.com/2013/technology/hardware/oregon-scientific-sensors-with-raspberry-pi/
#pragma once
#include "ofMain.h"
#include "wiringPi.h"

#define linesPerRevolution 9600 //500 lines * 4 edges * gear ratio (48:10);

class rotaryencoder
{
public:
    rotaryencoder(int _a, int _b);
    
    void update();
    
    //encoder
    int encoderPinA = 0; //A2
    int encoderPinB = 7; //A3
    int dir = 1;
    
    int encoderPosition = 0;
    unsigned int wrappedCounter = 1;
    
private:
    static void handleInterrupt();
    static int counterValue;
    static bool A_set;
    static bool B_set;
};