getDirections.c

/*
 * @file getstates.c
 *
 * @author Andy Lindsay
 *
 * @version 0.85
 *
 * @copyright Copyright (C) Parallax, Inc. 2012.  See end of file for
 * terms of use (MIT License).
 *
 * @brief getStates 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 get_directions(int endPin, 
                            int startPin)     // getStates function definition
{
  unsigned int pattern = DIRA;                // Copy INA
  if(endPin < startPin)                       // Handle reverse pin size
  {
    int temp = startPin;
    startPin = endPin;
    endPin = temp;
  }
  pattern <<= (31 - endPin);                  // Remove zeros to left
  pattern >>= (31 - endPin + startPin);       // Right justify & return
  return pattern ;                            // Right justify & return
}