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-.. _arduino-volatile:
-
-volatile keyword
-================
-
-volatile is a keyword known as a variable *qualifier*, it is
-usually used before the datatype of a variable, to modify the way
-in which the compiler and subsequent program treats the variable.
-
-
-
-Declaring a variable volatile is a directive to the compiler. The
-compiler is software which translates your C/C++ code into the
-machine code, which are the real instructions for the Atmega chip
-in the Arduino.
-
-
-
-Specifically, it directs the compiler to load the variable from RAM
-and not from a storage register, which is a temporary memory
-location where program variables are stored and manipulated. Under
-certain conditions, the value for a variable stored in registers
-can be inaccurate.
-
-
-
-A variable should be declared volatile whenever its value can be
-changed by something beyond the control of the code section in
-which it appears, such as a concurrently executing thread. In the
-Arduino, the only place that this is likely to occur is in sections
-of code associated with interrupts, called an interrupt service
-routine.
-
-
-
-Example
--------
-
-::
-
-    // toggles LED when interrupt pin changes state
-    
-    int pin = 13;
-    volatile int state = LOW;
-    
-    void setup()
-    {
-      pinMode(pin, OUTPUT);
-      attachInterrupt(0, blink, CHANGE);
-    }
-    
-    void loop()
-    {
-      digitalWrite(pin, state);
-    }
-    
-    void blink()
-    {
-      state = !state;
-    }
-
-
-
-See also
---------
-
-
--  `AttachInterrupt <http://arduino.cc/en/Reference/AttachInterrupt>`_
-
-