How do I write a Class in Arduino Language

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hi there..

I normaly are programming in Processing. Just one week ago I started with the Arduino. My small question: How can I write a "Class" in Arduino? When I do it like in Processing. Its not working ..:frowning:

bye
Daniel

2

You need to use C++ syntax, not Java like in Processing. Take a look at the source code for the libraries in hardware/libraries - they have some examples. Or see the tutorial on writing a library: http://www.arduino.cc/en/Hacking/LibraryTutorial

3

You need to use C++ syntax, not Java like in Processing. Take a look at the source code for the libraries in hardware/libraries - they have some examples. Or see the tutorial on writing a library: http://www.arduino.cc/en/Hacking/LibraryTutorial

Sí Sí, thats what I supposed that I have to write it in C++ :wink: ...but I don't know how! -) But thanx a lot, so I will take a look at the "how to write a library" tutorial:-)

...is a Library in C++ the same like a Class in Java?

4

...is a Library in C++ the same like a Class in Java?

A library in the Arduino environment is typically written as a class but it does not need to be one. It just happens that the Arduino documentation on writing a class happens to be in a library tutorial.

A C++ class is similar but not exactly the same as a java class. I posted an example of a simple java class ported to the Arduino here: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1207661024

5

Here's an example of a class:

class Button {
private:
  byte down_at;
  byte down;
  
public:
  Button();
  byte downFor();
  void resetDown();
  bool isDown();
  void turnOn();
  void turnOff();
};

Button::Button()
{
  this->down_at = 0;
  this->down = 0;
}

// Find the number of beats the button has been down for. Function can compute max. 8 sec down before rolling over.
byte Button::downFor()
{
  byte time;
  if (this->down_at > sc_beat)
  {
   time = (sc_beat + 256) - this->down_at;
  }
  else
  {
    time = sc_beat - this->down_at;
  }
  return time;
}

bool Button::isDown()
{
  return (bool)this->down;
}

void Button::resetDown()
{
  this->down_at = sc_beat;
  this->down = 1;
}
  
void Button::turnOn()
{
  if (!this->down)
  {
    this->down_at = sc_beat;
    this->down = 1;
  }
  return;
}

void Button::turnOff()
{
  this->down = 0;
  return;
}
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