toggle.c

/*
 * @file toggle.c
 *
 * @author Andy Lindsay
 *
 * @version 0.85
 *
 * @copyright Copyright (C) Parallax, Inc. 2012.  See end of file for
 * terms of use (MIT License).
 *
 * @brief toggle function source, see simpletools.h for documentation.
 *
 * @detail Please submit bug reports, suggestions, and improvements to
 * this code to editor@parallax.com.
 */
 
#include "simpletools.h"                      // simpletools function prototypes
 
unsigned int toggle(int pin)                  // toggle function definition
{
  int mask = 1 << pin;
  OUTA ^= mask;
  DIRA |= mask;
  return (OUTA >> pin) & 1;
}