154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* LongUnion.h
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*
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* Copyright (C) 2020-2022 Armin Joachimsmeyer
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* Email: armin.joachimsmeyer@gmail.com
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*
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* This file is part of Arduino-Utils https://github.com/ArminJo/Arduino-Utils.
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*
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* Arduino-Utils is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/gpl.html>.
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*
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*/
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#if !defined(_WORD_UNION_H) || !defined(_LONG_UNION_H) || !defined(_LONG_LONG_UNION_H)
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#include <stdint.h>
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#ifndef _WORD_UNION_H
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#define _WORD_UNION_H
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/**
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* Union to specify parts / manifestations of a 16 bit Word without casts and shifts.
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* It also supports the compiler generating small code.
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* Usage: WordUnion tWord;
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* tWord.UByte.HighByte = 0x12;
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*/
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union WordUnion {
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struct {
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uint8_t LowByte;
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uint8_t HighByte;
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} UByte;
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struct {
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int8_t LowByte;
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int8_t HighByte;
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} Byte;
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uint8_t UBytes[2]; // UBytes[0] is LowByte
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int8_t Bytes[2];
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uint16_t UWord;
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int16_t Word;
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uint8_t *BytePointer;
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};
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#endif // _WORD_UNION_H
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#ifndef _LONG_UNION_H
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#define _LONG_UNION_H
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/**
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* Union to specify parts / manifestations of a 32 bit Long without casts and shifts.
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* It also supports the compiler generating small code.
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*/
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union LongUnion {
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struct {
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uint8_t LowByte;
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uint8_t MidLowByte;
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uint8_t MidHighByte;
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uint8_t HighByte;
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} UByte;
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struct {
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int8_t LowByte;
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int8_t MidLowByte;
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int8_t MidHighByte;
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int8_t HighByte;
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} Byte;
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/* Does not work for STM32
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struct {
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uint8_t LowByte;
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uint16_t MidWord;
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uint8_t HighByte;
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} UByteWord;
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*/
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struct {
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uint16_t LowWord;
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uint16_t HighWord;
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} UWord;
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struct {
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int16_t LowWord;
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int16_t HighWord;
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} Word;
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struct {
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WordUnion LowWord;
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WordUnion HighWord;
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} WordUnion;
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uint8_t UBytes[4]; // seems to have the same code size as using struct UByte
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int8_t Bytes[4]; // Bytes[0] is LowByte
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uint16_t UWords[2];
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int16_t Words[2];
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uint32_t ULong;
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int32_t Long;
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float Float;
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};
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#endif // _LONG_UNION_H
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#ifndef _LONG_LONG_UNION_H
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#define _LONG_LONG_UNION_H
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/**
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* Union to specify parts / manifestations of a 64 bit LongLong without casts and shifts.
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* It also supports the compiler generating small code.
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*/
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union LongLongUnion {
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struct {
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uint16_t LowWord;
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uint16_t MidLowWord;
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uint16_t MidHighWord;
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uint16_t HighWord;
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} UWord;
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struct {
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int16_t LowWord;
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int16_t MidLowWord;
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int16_t MidHighWord;
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int16_t HighWord;
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} Word;
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struct {
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WordUnion LowWord;
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WordUnion MidLowWord;
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WordUnion MidHighWord;
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WordUnion HighWord;
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} WordUnion;
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struct {
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uint32_t LowLong;
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uint32_t HighLong;
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} ULong;
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struct {
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int32_t LowLong;
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int32_t HighLong;
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} Long;
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struct {
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LongUnion LowLong;
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LongUnion HighLong;
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} LongUnion;
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uint8_t UBytes[8]; // seems to have the same code size as using struct UByte
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int8_t Bytes[8];
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uint16_t UWords[4];
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int16_t Words[4];
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uint64_t ULongLong;
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int64_t LongLong;
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#if __DBL_MANT_DIG__== 24
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float Floats[2]; // 32 bit double, as for AVR
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#else
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// 64 bit double
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double Double;
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#endif
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};
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#endif // _LONG_LONG_UNION_H
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#endif // !defined(_WORD_UNION_H) || !defined(_LONG_UNION_H) || !defined(_LONG_LONG_UNION_H)
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