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Dependents: TYBLE16_simple_data_logger TYBLE16_MP3_Air
SlicingBlockDevice Class Reference
Block device for mapping to a slice of another block device. More...
#include <SlicingBlockDevice.h>
Inherits mbed::BlockDevice.
Public Member Functions | |
| SlicingBlockDevice (BlockDevice *bd, bd_addr_t start, bd_addr_t end=0) | |
| Lifetime of the memory block device. | |
| virtual | ~SlicingBlockDevice () |
| Lifetime of a block device. | |
| virtual int | init () |
| Initialize a block device. | |
| virtual int | deinit () |
| Deinitialize a block device. | |
| virtual int | sync () |
| Ensure data on storage is in sync with the driver. | |
| 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 int | get_erase_value () const |
| Get the value of storage when erased. | |
| virtual bd_size_t | size () const |
| Get the total size of the underlying device. | |
| virtual const char * | get_type () const |
| Get the BlockDevice class type. | |
| virtual bool | is_valid_program (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block program validity. | |
| virtual bool | is_valid_read (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block read validity. | |
| virtual bool | is_valid_erase (bd_addr_t addr, bd_size_t size) const |
| Convenience function for checking block erase validity. | |
| virtual int | trim (bd_addr_t addr, bd_size_t size) |
| Mark blocks as no longer in use. | |
Static Public Member Functions | |
| static BlockDevice * | get_default_instance () |
| Return the default block device. | |
Detailed Description
Block device for mapping to a slice of another block device.
Definition at line 36 of file SlicingBlockDevice.h.
Constructor & Destructor Documentation
| SlicingBlockDevice | ( | BlockDevice * | bd, |
| bd_addr_t | start, | ||
| bd_addr_t | end = 0 |
||
| ) |
Lifetime of the memory block device.
- Parameters:
-
bd Block device to back the SlicingBlockDevice start Start block address to map to block 0, negative addresses are calculated from the end of the underlying block device end End 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.
Definition at line 25 of file SlicingBlockDevice.cpp.
| virtual ~SlicingBlockDevice | ( | ) | [virtual] |
Lifetime of a block device.
Definition at line 52 of file SlicingBlockDevice.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 74 of file SlicingBlockDevice.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, unless get_erase_value returns a non-negative byte value
- 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 or a negative error code on failure
Reimplemented from BlockDevice.
Definition at line 100 of file SlicingBlockDevice.cpp.
| MBED_WEAK BlockDevice * get_default_instance | ( | ) | [static, inherited] |
Return the default block device.
Returns the default block device based on the configuration JSON. Use the components in target.json or application config to change the default block device.
An application can override all target settings by implementing BlockDevice::get_default_instance() - the default definition is weak, and calls get_target_default_instance().
Definition at line 63 of file SystemStorage.cpp.
| bd_size_t 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.
Definition at line 133 of file SlicingBlockDevice.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 138 of file SlicingBlockDevice.cpp.
| int 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.
Definition at line 143 of file SlicingBlockDevice.cpp.
| bd_size_t 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.
Definition at line 128 of file SlicingBlockDevice.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 123 of file SlicingBlockDevice.cpp.
| const char * get_type | ( | ) | const [virtual] |
Get the BlockDevice class type.
- Returns:
- A string represent the BlockDevice class type.
Implements BlockDevice.
Definition at line 153 of file SlicingBlockDevice.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 SlicingBlockDevice.cpp.
| bool is_valid_erase | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [virtual] |
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
Reimplemented from BlockDevice.
Definition at line 118 of file SlicingBlockDevice.cpp.
| bool is_valid_program | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [virtual] |
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
Reimplemented from BlockDevice.
Definition at line 113 of file SlicingBlockDevice.cpp.
| bool is_valid_read | ( | bd_addr_t | addr, |
| bd_size_t | size | ||
| ) | const [virtual] |
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
Reimplemented from BlockDevice.
Definition at line 108 of file SlicingBlockDevice.cpp.
| 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 or a negative error code on failure
Implements BlockDevice.
Definition at line 92 of file SlicingBlockDevice.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 or a negative error code on failure
Implements BlockDevice.
Definition at line 84 of file SlicingBlockDevice.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 148 of file SlicingBlockDevice.cpp.
| int 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.
Definition at line 79 of file SlicingBlockDevice.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 the erase block size
- Returns:
- 0 on success or a negative error code on failure
Reimplemented in SDBlockDevice, and BufferedBlockDevice.
Definition at line 136 of file BlockDevice.h.
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