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