input.c

/*
 * @file input.c
 *
 * @author Andy Lindsay
 *
 * @version 0.85
 *
 * @copyright Copyright (C) Parallax, Inc. 2012.  See end of file for
 * terms of use (MIT License).
 *
 * @brief input 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
 
int input(int pin)                            // input function definition
{
  int mask = 1 << pin;                        // Set up mask
  DIRA &= ~mask;                              // AND DIRA with NOT mask
  return (INA & mask) >> pin;                 // Return input state
}