Rtos API example
ChainingBlockDevice Class Reference
Block device for chaining multiple block devices with the similar block sizes at sequential addresses. More...
#include <ChainingBlockDevice.h>
Inherits BlockDevice.
Public Member Functions | |
ChainingBlockDevice (BlockDevice **bds, size_t bd_count) | |
Lifetime of the memory block device. | |
template<size_t Size> | |
ChainingBlockDevice (BlockDevice *(&bds)[Size]) | |
Lifetime of the memory block device. | |
virtual | ~ChainingBlockDevice () |
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 programable block. | |
virtual bd_size_t | get_erase_size () const |
Get the size of a eraseable block. | |
virtual bd_size_t | size () const |
Get the total size of the underlying device. | |
virtual int | trim (bd_addr_t addr, bd_size_t size) |
Mark blocks as no longer in use. | |
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
Block device for chaining multiple block devices with the similar block sizes at sequential addresses.
#include "mbed.h" #include "HeapBlockDevice.h" #include "ChainingBlockDevice.h" // Create two smaller block devices with // 64 and 32 blocks of size 512 bytes HeapBlockDevice mem1(64*512, 512); HeapBlockDevice mem2(32*512, 512); // Create a block device backed by mem1 and mem2 // contains 96 blocks of size 512 bytes BlockDevice *bds[] = {&mem1, &mem2}; ChainingBlockDevice chainmem(bds);
Definition at line 48 of file ChainingBlockDevice.h.
Constructor & Destructor Documentation
ChainingBlockDevice | ( | BlockDevice ** | bds, |
size_t | bd_count | ||
) |
Lifetime of the memory block device.
- Parameters:
-
bds Array of block devices to chain with sequential block addresses bd_count Number of block devices to chain
- Note:
- All block devices must have the same block size
Definition at line 20 of file ChainingBlockDevice.cpp.
ChainingBlockDevice | ( | BlockDevice *(&) | bds[Size] ) |
Lifetime of the memory block device.
- Parameters:
-
bds Array of block devices to chain with sequential block addresses
- Note:
- All block devices must have the same block size
Definition at line 65 of file ChainingBlockDevice.h.
virtual ~ChainingBlockDevice | ( | ) | [virtual] |
Lifetime of the memory block device.
Definition at line 74 of file ChainingBlockDevice.h.
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 75 of file ChainingBlockDevice.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 149 of file ChainingBlockDevice.cpp.
bd_size_t get_erase_size | ( | ) | const [virtual] |
Get the size of a eraseable block.
- Returns:
- Size of a eraseable block in bytes
- Note:
- Must be a multiple of the program size
Reimplemented from BlockDevice.
Definition at line 188 of file ChainingBlockDevice.cpp.
bd_size_t get_program_size | ( | ) | const [virtual] |
Get the size of a programable block.
- Returns:
- Size of a programable block in bytes
- Note:
- Must be a multiple of the read size
Implements BlockDevice.
Definition at line 183 of file ChainingBlockDevice.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 178 of file ChainingBlockDevice.cpp.
int init | ( | ) | [virtual] |
Initialize a block device.
- Returns:
- 0 on success or a negative error code on failure
Implements BlockDevice.
Definition at line 31 of file ChainingBlockDevice.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 178 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 164 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 150 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 118 of file ChainingBlockDevice.cpp.
int read | ( | void * | buffer, |
bd_addr_t | addr, | ||
bd_size_t | size | ||
) | [virtual] |
Read blocks from a block device.
- Parameters:
-
buffer Buffer to write blocks to 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 87 of file ChainingBlockDevice.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 193 of file ChainingBlockDevice.cpp.
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 110 of file BlockDevice.h.
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