Lazily allocated heap-backed block device. More...

#include <HeapBlockDevice.h>

Public Member Functions
	HeapBlockDevice (bd_size_t size, bd_size_t block=512)
	Lifetime of the memory block device.
	HeapBlockDevice (bd_size_t size, bd_size_t read, bd_size_t program, bd_size_t erase)
	Lifetime of the memory block device.
virtual int	init ()
	Initialize a block device.
virtual int	deinit ()
	Deinitialize a block device.
virtual int	read (void *buffer, bd_addr_t addr, bd_size_t size)
	Read blocks from a block device.
virtual int	program (const void *buffer, bd_addr_t addr, bd_size_t size)
	Program blocks to a block device.
virtual int	erase (bd_addr_t addr, bd_size_t size)
	Erase blocks on a block device.
virtual bd_size_t	get_read_size () const
	Get the size of a readable block.
virtual bd_size_t	get_program_size () const
	Get the size of a programmable block.
virtual bd_size_t	get_erase_size () const
	Get the size of an erasable block.
virtual bd_size_t	get_erase_size (bd_addr_t addr) const
	Get the size of an erasable block given address.
virtual bd_size_t	size () const
	Get the total size of the underlying device.
virtual int	sync ()
	Ensure data on storage is in sync with the driver.
virtual int	trim (bd_addr_t addr, bd_size_t size)
	Mark blocks as no longer in use.
virtual int	get_erase_value () const
	Get the value of storage when erased.
bool	is_valid_read (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block read validity.
bool	is_valid_program (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block program validity.
bool	is_valid_erase (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block erase validity.

Detailed Description

Lazily allocated heap-backed block device.

Useful for simulating a block device and tests

 #include "mbed.h"
 #include "HeapBlockDevice.h"

 #define BLOCK_SIZE 512

 HeapBlockDevice bd(2048, BLOCK_SIZE); // 2048 bytes with a block size of 512 bytes
 uint8_t block[BLOCK_SIZE] = "Hello World!\n";

 int main() {
     bd.init();
     bd.erase(0, BLOCK_SIZE);
     bd.program(block, 0, BLOCK_SIZE);
     bd.read(block, 0, BLOCK_SIZE);
     printf("%s", block);
     bd.deinit();
 }

Definition at line 52 of file HeapBlockDevice.h.

Constructor & Destructor Documentation

HeapBlockDevice	(	bd_size_t	size,
		bd_size_t	block = `512`
	)

Lifetime of the memory block device.

Parameters:

size	Size of the Block Device in bytes
block	Block size in bytes. Minimum read, program, and erase sizes are configured to this value

Definition at line 20 of file HeapBlockDevice.cpp.

HeapBlockDevice	(	bd_size_t	size,
		bd_size_t	read,
		bd_size_t	program,
		bd_size_t	erase
	)

Lifetime of the memory block device.

Parameters:

size	Size of the Block Device in bytes
read	Minimum read size required in bytes
program	Minimum program size required in bytes
erase	Minimum erase size required in bytes

Definition at line 27 of file HeapBlockDevice.cpp.

Member Function Documentation

int deinit ( ) [virtual]

Deinitialize a block device.

Returns:: 0 on success or a negative error code on failure

Implements BlockDevice.

Definition at line 58 of file HeapBlockDevice.cpp.

int erase	(	bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Erase blocks on a block device.

The state of an erased block is undefined until it has been programmed

Parameters:

addr	Address of block to begin erasing
size	Size to erase in bytes, must be a multiple of erase block size

Returns:: 0 on success, negative error code on failure

Reimplemented from BlockDevice.

Definition at line 147 of file HeapBlockDevice.cpp.

bd_size_t get_erase_size ( ) const [virtual]

Get the size of an erasable block.

Returns:: Size of an erasable block in bytes

Reimplemented from BlockDevice.

Definition at line 78 of file HeapBlockDevice.cpp.

bd_size_t get_erase_size ( bd_addr_t addr ) const [virtual]

Get the size of an erasable block given address.

Parameters:

addr	Address within the erasable block

Returns:: Size of an erasable block in bytes

Note:: Must be a multiple of the program size

Reimplemented from BlockDevice.

Definition at line 84 of file HeapBlockDevice.cpp.

virtual int get_erase_value ( ) const [virtual, inherited]

Get the value of storage when erased.

If get_erase_value returns a non-negative byte value, the underlying storage is set to that value when erased, and storage containing that value can be programmed without another erase.

Returns:: The value of storage when erased, or -1 if you can't rely on the value of erased storage

Reimplemented in ChainingBlockDevice, ExhaustibleBlockDevice, MBRBlockDevice, ProfilingBlockDevice, and SlicingBlockDevice.

Definition at line 168 of file BlockDevice.h.

bd_size_t get_program_size ( ) const [virtual]

Get the size of a programmable block.

Returns:: Size of a programmable block in bytes

Implements BlockDevice.

Definition at line 72 of file HeapBlockDevice.cpp.

bd_size_t get_read_size ( ) const [virtual]

Get the size of a readable block.

Returns:: Size of a readable block in bytes

Implements BlockDevice.

Definition at line 66 of file HeapBlockDevice.cpp.

int init ( ) [virtual]

Initialize a block device.

Returns:: 0 on success or a negative error code on failure

Implements BlockDevice.

Definition at line 46 of file HeapBlockDevice.cpp.

bool is_valid_erase	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block erase validity.

Parameters:

addr	Address of block to begin erasing
size	Size to erase in bytes

Returns:: True if erase is valid for underlying block device

Definition at line 213 of file BlockDevice.h.

bool is_valid_program	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block program validity.

Parameters:

addr	Address of block to begin writing to
size	Size to write in bytes

Returns:: True if program is valid for underlying block device

Definition at line 199 of file BlockDevice.h.

bool is_valid_read	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block read validity.

Parameters:

addr	Address of block to begin reading from
size	Size to read in bytes

Returns:: True if read is valid for underlying block device

Definition at line 185 of file BlockDevice.h.

int program	(	const void *	buffer,
		bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Program blocks to a block device.

The blocks must have been erased prior to being programmed

Parameters:

buffer	Buffer of data to write to blocks
addr	Address of block to begin writing to
size	Size to write in bytes, must be a multiple of program block size

Returns:: 0 on success, negative error code on failure

Implements BlockDevice.

Definition at line 120 of file HeapBlockDevice.cpp.

int read	(	void *	buffer,
		bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Read blocks from a block device.

Parameters:

buffer	Buffer to read blocks into
addr	Address of block to begin reading from
size	Size to read in bytes, must be a multiple of read block size

Returns:: 0 on success, negative error code on failure

Implements BlockDevice.

Definition at line 96 of file HeapBlockDevice.cpp.

bd_size_t size ( ) const [virtual]

Get the total size of the underlying device.

Returns:: Size of the underlying device in bytes

Implements BlockDevice.

Definition at line 90 of file HeapBlockDevice.cpp.

virtual int sync ( ) [virtual, inherited]

Ensure data on storage is in sync with the driver.

Returns:: 0 on success or a negative error code on failure

Reimplemented in ChainingBlockDevice, ExhaustibleBlockDevice, MBRBlockDevice, ProfilingBlockDevice, and SlicingBlockDevice.

Definition at line 66 of file BlockDevice.h.

virtual int trim	(	bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual, inherited]`

Mark blocks as no longer in use.

This function provides a hint to the underlying block device that a region of blocks is no longer in use and may be erased without side effects. Erase must still be called before programming, but trimming allows flash-translation-layers to schedule erases when the device is not busy.

Parameters:

addr	Address of block to mark as unused
size	Size to mark as unused in bytes, must be a multiple of erase block size

Returns:: 0 on success, negative error code on failure

Definition at line 120 of file BlockDevice.h.

Type:	Program
Mbed OS support:	Mbed OS
Created:	29 Mar 2018
Imports:	22
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	6

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HeapBlockDevice Class Reference

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

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