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