Mistake on this page?
Report an issue in GitHub or email us
Public Member Functions | Protected Attributes
SlicingBlockDevice Class Reference

#include <SlicingBlockDevice.h>

Inheritance diagram for SlicingBlockDevice:
BlockDevice

Public Member Functions

 SlicingBlockDevice (BlockDevice *bd, bd_addr_t start, bd_addr_t end=0)
 
virtual ~SlicingBlockDevice ()
 
virtual int init ()
 
virtual int deinit ()
 
virtual int sync ()
 
virtual int read (void *buffer, bd_addr_t addr, bd_size_t size)
 
virtual int program (const void *buffer, bd_addr_t addr, bd_size_t size)
 
virtual int erase (bd_addr_t addr, bd_size_t size)
 
virtual bd_size_t get_read_size () const
 
virtual bd_size_t get_program_size () const
 
virtual bd_size_t get_erase_size () const
 
virtual bd_size_t get_erase_size (bd_addr_t addr) const
 
virtual int get_erase_value () const
 
virtual bd_size_t size () const
 
- Public Member Functions inherited from BlockDevice
virtual ~BlockDevice ()
 
virtual int trim (bd_addr_t addr, bd_size_t size)
 
bool is_valid_read (bd_addr_t addr, bd_size_t size) const
 
bool is_valid_program (bd_addr_t addr, bd_size_t size) const
 
bool is_valid_erase (bd_addr_t addr, bd_size_t size) const
 

Protected Attributes

BlockDevice_bd
 
bool _start_from_end
 
bd_size_t _start
 
bool _stop_from_end
 
bd_size_t _stop
 

Detailed Description

Block device for mapping to a slice of another block device

#include "mbed.h"
#include "HeapBlockDevice.h"
#include "SlicingBlockDevice.h"
// Create a block device with 64 blocks of size 512
HeapBlockDevice mem(64*512, 512);
// Create a block device that maps to the first 32 blocks
SlicingBlockDevice slice1(&mem, 0*512, 32*512);
// Create a block device that maps to the last 32 blocks
SlicingBlockDevice slice2(&mem, 32*512);
// Create a block device that maps to the middle 32 blocks
SlicingBlockDevice slice3(&mem, 16*512, -16*512);

Constructor & Destructor Documentation

SlicingBlockDevice::SlicingBlockDevice ( BlockDevice bd,
bd_addr_t  start,
bd_addr_t  end = 0 
)

Lifetime of the memory block device

Parameters
bdBlock device to back the SlicingBlockDevice
startStart block address to map to block 0, negative addresses are calculated from the end of the underlying block device
endEnd block address to mark the end of the block device, this block is not mapped, negative addresses are calculated from the end of the underlying block device. The default stops at end of the underlying block device.
virtual SlicingBlockDevice::~SlicingBlockDevice ( )
inlinevirtual

Lifetime of a block device

Member Function Documentation

int SlicingBlockDevice::deinit ( )
virtual

Deinitialize a block device

Returns
0 on success or a negative error code on failure

Implements BlockDevice.

int SlicingBlockDevice::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, unless get_erase_value returns a non-negative byte value

Parameters
addrAddress of block to begin erasing
sizeSize to erase in bytes, must be a multiple of erase block size
Returns
0 on success, negative error code on failure

Reimplemented from BlockDevice.

bd_size_t SlicingBlockDevice::get_erase_size ( ) const
virtual

Get the size of an erasable block

Returns
Size of an erasable block in bytes
Note
Must be a multiple of the program size

Reimplemented from BlockDevice.

bd_size_t SlicingBlockDevice::get_erase_size ( bd_addr_t  addr) const
virtual

Get the size of an erasable block given address

Parameters
addrAddress within the erasable block
Returns
Size of an erasable block in bytes
Note
Must be a multiple of the program size

Reimplemented from BlockDevice.

int SlicingBlockDevice::get_erase_value ( ) const
virtual

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 from BlockDevice.

bd_size_t SlicingBlockDevice::get_program_size ( ) const
virtual

Get the size of a programmable block

Returns
Size of a programmable block in bytes
Note
Must be a multiple of the read size

Implements BlockDevice.

bd_size_t SlicingBlockDevice::get_read_size ( ) const
virtual

Get the size of a readable block

Returns
Size of a readable block in bytes

Implements BlockDevice.

int SlicingBlockDevice::init ( )
virtual

Initialize a block device

Returns
0 on success or a negative error code on failure

Implements BlockDevice.

int SlicingBlockDevice::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
bufferBuffer of data to write to blocks
addrAddress of block to begin writing to
sizeSize to write in bytes, must be a multiple of program block size
Returns
0 on success, negative error code on failure

Implements BlockDevice.

int SlicingBlockDevice::read ( void *  buffer,
bd_addr_t  addr,
bd_size_t  size 
)
virtual

Read blocks from a block device

Parameters
bufferBuffer to read blocks into
addrAddress of block to begin reading from
sizeSize to read in bytes, must be a multiple of read block size
Returns
0 on success, negative error code on failure

Implements BlockDevice.

bd_size_t SlicingBlockDevice::size ( ) const
virtual

Get the total size of the underlying device

Returns
Size of the underlying device in bytes

Implements BlockDevice.

int SlicingBlockDevice::sync ( )
virtual

Ensure data on storage is in sync with the driver

Returns
0 on success or a negative error code on failure

Reimplemented from BlockDevice.


The documentation for this class was generated from the following files:
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.