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169 lines
4.7 KiB
C
169 lines
4.7 KiB
C
5 years ago
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/*
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* FreeRTOS+FAT build 191128 - Note: FreeRTOS+FAT is still in the lab!
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* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* Authors include James Walmsley, Hein Tibosch and Richard Barry
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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*
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*/
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/**
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* @file ff_memory.h
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* @ingroup MEMORY
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**/
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#ifndef _FF_MEMORY_H_
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#define _FF_MEMORY_H_
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/*
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* When sector data is written or analysed, some values might be stored unaligned.
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* The routines below treat all values as little arrays of either 2 or 4 bytes.
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* Also on big endian platforms, the order of bytes will be swapped.
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*/
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/*---------- PROTOTYPES */
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#if( ffconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN )
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/*
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* FAT is little endian.
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* On a little endian CPU, bytes will be copied to the structures below 1-to-1 :
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*/
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typedef struct
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{
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uint8_t u8_0; /* the first byte */
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uint8_t u8_1; /* the second byte */
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} FF_TShort_t;
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typedef struct
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{
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uint8_t u8_0;
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uint8_t u8_1;
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uint8_t u8_2;
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uint8_t u8_3;
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} FF_TLong_t;
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#elif( ffconfigBYTE_ORDER == pdFREERTOS_BIG_ENDIAN )
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/*
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* On a big endian CPU, all bytes will be swapped, either 2 or 4 bytes:
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*/
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typedef struct
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{
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uint8_t u8_1; /* the second byte */
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uint8_t u8_0; /* the first byte */
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} FF_TShort_t;
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typedef struct
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{
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uint8_t u8_3;
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uint8_t u8_2;
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uint8_t u8_1;
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uint8_t u8_0;
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} FF_TLong_t;
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#else
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#error Little or Big Endian? - Please set ffconfigBYTE_ORDER to either pdFREERTOS_LITTLE_ENDIAN or pdFREERTOS_BIG_ENDIAN 1 in FreeRTOSFATConfig.h
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#endif
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/*! 16-bit union. */
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typedef union
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{
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uint16_t u16;
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FF_TShort_t bytes;
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} FF_T_UN16;
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/*! 32-bit union. */
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typedef union
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{
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uint32_t u32;
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FF_TLong_t bytes;
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} FF_T_UN32;
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/* HT inlined these functions:
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*/
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#if( ffconfigINLINE_MEMORY_ACCESS != 0 )
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static portINLINE uint8_t FF_getChar( const uint8_t *pBuffer, uint32_t aOffset )
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{
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return ( uint8_t ) ( pBuffer[ aOffset ] );
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}
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static portINLINE uint16_t FF_getShort( const uint8_t *pBuffer, uint32_t aOffset )
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{
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FF_T_UN16 u16;
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pBuffer += aOffset;
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u16.bytes.u8_1 = pBuffer[ 1 ];
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u16.bytes.u8_0 = pBuffer[ 0 ];
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return u16.u16;
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}
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static portINLINE uint32_t FF_getLong( const uint8_t *pBuffer, uint32_t aOffset )
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{
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FF_T_UN32 u32;
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pBuffer += aOffset;
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u32.bytes.u8_3 = pBuffer[ 3 ];
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u32.bytes.u8_2 = pBuffer[ 2 ];
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u32.bytes.u8_1 = pBuffer[ 1 ];
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u32.bytes.u8_0 = pBuffer[ 0 ];
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return u32.u32;
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}
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static portINLINE void FF_putChar( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value )
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{
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pBuffer[ aOffset ] = ( uint8_t ) Value;
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}
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static portINLINE void FF_putShort( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value )
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{
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FF_T_UN16 u16;
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u16.u16 = ( uint16_t ) Value;
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pBuffer += aOffset;
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pBuffer[ 0 ] = u16.bytes.u8_0;
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pBuffer[ 1 ] = u16.bytes.u8_1;
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}
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static portINLINE void FF_putLong( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value )
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{
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FF_T_UN32 u32;
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u32.u32 = Value;
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pBuffer += aOffset;
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pBuffer[ 0 ] = u32.bytes.u8_0;
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pBuffer[ 1 ] = u32.bytes.u8_1;
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pBuffer[ 2 ] = u32.bytes.u8_2;
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pBuffer[ 3 ] = u32.bytes.u8_3;
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}
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#else /* ffconfigINLINE_MEMORY_ACCESS */
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uint8_t FF_getChar( const uint8_t *pBuffer, uint32_t aOffset );
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uint16_t FF_getShort( const uint8_t *pBuffer, uint32_t aOffset );
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uint32_t FF_getLong( const uint8_t *pBuffer, uint32_t aOffset );
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void FF_putChar( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value );
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void FF_putShort( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value );
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void FF_putLong( uint8_t *pBuffer, uint32_t aOffset, uint32_t Value );
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#endif /* ffconfigINLINE_MEMORY_ACCESS */
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#endif /* _FF_MEMORY_H_ */
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