text: /** Simple On-board LED flashing program - written by Derek Molloy
  *    simple OOP  struture for the Exploring BeagleBone book
  *
  *    This program uses all four LEDS and can be executed in three ways:
  *         makeLEDs on
  *         makeLEDs off
  *         makeLEDs flash  (flash at time delay intervals)
  *         makeLEDs status (get the trigger status)
  *
  * Written by Derek Molloy for the book "Exploring BeagleBone: Tools and
  * Techniques for Building with Embedded Linux" by John Wiley & Sons, 2014
  * ISBN 9781118935125. Please see the file README.md in the repository root
  * directory for copyright and GNU GPLv3 license information.            */
  
  #include<iostream>
  #include<fstream>
  #include<string>
  #include<sstream>
  using namespace std;
  
  #define LED_PATH "/sys/class/leds/beaglebone:green:usr"
  
  class LED{
     private:
        string path;
        int number;
        virtual void writeLED(string filename, string value);
        virtual void removeTrigger();
     public:
        LED(int number);
        virtual void turnOn();
        virtual void turnOff();
        virtual void flash(string delayms);
        virtual void outputState();
        virtual ~LED();
  };
  