FatCache Class Reference

Block cache. More...

#include <FatVolume.h>

Public Member Functions
cache_t *	block ()
void	dirty ()
void	init (FatVolume *vol)
void	invalidate ()
uint32_t	lbn ()
cache_t *	read (uint32_t lbn, uint8_t option)
bool	sync ()

Static Public Attributes
static const uint8_t	CACHE_FOR_READ = 0
static const uint8_t	CACHE_FOR_WRITE = CACHE_STATUS_DIRTY
static const uint8_t	CACHE_OPTION_NO_READ = 4
static const uint8_t	CACHE_RESERVE_FOR_WRITE = CACHE_STATUS_DIRTY | CACHE_OPTION_NO_READ
static const uint8_t	CACHE_STATUS_DIRTY = 1
static const uint8_t	CACHE_STATUS_MASK = CACHE_STATUS_DIRTY | CACHE_STATUS_MIRROR_FAT
static const uint8_t	CACHE_STATUS_MIRROR_FAT = 2

Detailed Description

Block cache.

Member Function Documentation

cache_t* FatCache::block ( )

inline

Returns

Cache block address.

void FatCache::dirty ( )

inline

Set current block dirty.

void FatCache::init ( FatVolume *  vol )

inline

Initialize the cache.

Parameters

[in]

vol

FatVolume that owns this FatCache.

void FatCache::invalidate ( )

inline

Invalidate current cache block.

uint32_t FatCache::lbn ( )

inline

Returns

Logical block number for cached block.

cache_t * FatCache::read	(	uint32_t	lbn,
		uint8_t	option
	)

Read a block into the cache.

Parameters

[in]	lbn	Block to read.
[in]	option	mode for cached block.

Returns

Address of cached block.

bool FatCache::sync

(

)

Write current block if dirty.

Returns

true for success else false.

Member Data Documentation

const uint8_t FatCache::CACHE_FOR_READ = 0

static

Cache block for read.

const uint8_t FatCache::CACHE_FOR_WRITE = CACHE_STATUS_DIRTY

static

Cache block for write.

const uint8_t FatCache::CACHE_OPTION_NO_READ = 4

static

Sync existing block but do not read new block.

const uint8_t FatCache::CACHE_RESERVE_FOR_WRITE = CACHE_STATUS_DIRTY | CACHE_OPTION_NO_READ

static

Reserve cache block for write - do not read from block device.

const uint8_t FatCache::CACHE_STATUS_DIRTY = 1

static

Cached block is dirty

const uint8_t FatCache::CACHE_STATUS_MASK = CACHE_STATUS_DIRTY | CACHE_STATUS_MIRROR_FAT

static

Cache block status bits

const uint8_t FatCache::CACHE_STATUS_MIRROR_FAT = 2

static

Cashed block is FAT entry and must be mirrored in second FAT.

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The documentation for this class was generated from the following files:

• Arduino/libraries/SdFat/src/FatLib/FatVolume.h
• Arduino/libraries/SdFat/src/FatLib/FatVolume.cpp