pic24_unions.h

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/*
 * "Copyright (c) 2008 Robert B. Reese, Bryan A. Jones, J. W. Bruce ("AUTHORS")"
 * All rights reserved.
 * (R. Reese, reese_AT_ece.msstate.edu, Mississippi State University)
 * (B. A. Jones, bjones_AT_ece.msstate.edu, Mississippi State University)
 * (J. W. Bruce, jwbruce_AT_ece.msstate.edu, Mississippi State University)
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the authors appear in all copies of this software.
 *
 * IN NO EVENT SHALL THE "AUTHORS" BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE "AUTHORS"
 * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE "AUTHORS" SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE "AUTHORS" HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Please maintain this header in its entirety when copying/modifying
 * these files.
 *
 *
 */


// Documentation for this file. If the \file tag isn't present,
// this file won't be documented.
/** \file
 *  Typedefs and structures to allow for generic 8-, 16-, 32-, and 64-bit
 *  variables.
 */

#pragma once

#include <stdint.h>

/// A union type for byte or word access for 16 bit values.
typedef union _union16 {
  uint16_t u16;
  uint8_t u8[2];
} union16;

/// A union type for byte, word, or dword access for 32 bit values.
typedef union _union32 {
  uint32_t u32;

  struct {
    uint16_t ls16;
    uint16_t ms16;
  } u16;

  uint8_t u8[4];
} union32;

/// A union type for byte, word, or dword access for 64 bit values.
typedef union _union64 {
  uint32_t u32[2];
  uint16_t u16[4];
  uint8_t u8[8];
} union64;