A class to communicate a USB flash disk. More...

#include <USBHostMSD.h>

Inherits IUSBEnumerator, and BlockDevice.

Public Member Functions
	USBHostMSD ()
	Constructor.
bool	connected ()
	Check if a MSD device is connected.
bool	connect ()
	Try to connect to a MSD 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	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 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.
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

A class to communicate a USB flash disk.

Definition at line 31 of file USBHostMSD.h.

Constructor & Destructor Documentation

USBHostMSD ( )

Constructor.

Parameters:

rootdir mount name

Definition at line 31 of file USBHostMSD.cpp.

Member Function Documentation

bool connect ( void )

Try to connect to a MSD device.

Returns:: true if connection was successful

Definition at line 61 of file USBHostMSD.cpp.

bool connected ( )

Check if a MSD device is connected.

Returns:: true if a MSD device is connected

Definition at line 56 of file USBHostMSD.cpp.

virtual int deinit ( ) [virtual]

Deinitialize a block device.

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

Implements BlockDevice.

Definition at line 55 of file USBHostMSD.h.

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, negative error code on failure

Reimplemented from BlockDevice.

Definition at line 382 of file USBHostMSD.cpp.

virtual bd_size_t get_erase_size ( bd_addr_t addr ) const [virtual, inherited]

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

Definition at line 154 of file BlockDevice.h.

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 396 of file USBHostMSD.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

Note:: Must be a multiple of the read size

Implements BlockDevice.

Definition at line 392 of file USBHostMSD.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 387 of file USBHostMSD.cpp.

int init ( ) [virtual]

Initialize a block device.

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

Implements BlockDevice.

Definition at line 319 of file USBHostMSD.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

If a failure occurs, it is not possible to determine how many bytes succeeded

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 340 of file USBHostMSD.cpp.

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

Read blocks from a block device.

If a failure occurs, it is not possible to determine how many bytes succeeded

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 361 of file USBHostMSD.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 401 of file USBHostMSD.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:	13 Apr 2018
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

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