Memory Control Access

Common abstraction layer for memory interfaces.

It provides interfaces between: Memory and USB, Memory and RAM, Memory and Memory. Common API for XMEGA and UC3.

Macros
#define	SECTOR_SIZE   512

Enumerations
enum	Ctrl_status {   CTRL_GOOD = PASS,   CTRL_FAIL = FAIL,   CTRL_NO_PRESENT = FAIL + 1,   CTRL_BUSY = FAIL + 2 }
	Status returned by CTRL_ACCESS interfaces. More...

Control Interface
static bool	ctrl_access_lock (void)
	Locks accesses to LUNs. More...

LUN IDs
#define	LUN_ID_0   (0)
	First static LUN. More...
#define	LUN_ID_1   (LUN_ID_0 + LUN_0)
#define	LUN_ID_2   (LUN_ID_1 + LUN_1)
#define	LUN_ID_3   (LUN_ID_2 + LUN_2)
#define	LUN_ID_4   (LUN_ID_3 + LUN_3)
#define	LUN_ID_5   (LUN_ID_4 + LUN_4)
#define	LUN_ID_6   (LUN_ID_5 + LUN_5)
#define	LUN_ID_7   (LUN_ID_6 + LUN_6)
#define	MAX_LUN   (LUN_ID_7 + LUN_7)
	Number of static LUNs. More...
#define	LUN_ID_USB   (MAX_LUN)
	First dynamic LUN (USB host mass storage). More...

Control Interface
bool	ctrl_access_init (void)
	Initializes the LUN access locker. More...
U8	get_nb_lun (void)
	Returns the number of LUNs. More...
U8	get_cur_lun (void)
	Returns the current LUN. More...
Ctrl_status	mem_test_unit_ready (U8 lun)
	Tests the memory state and initializes the memory if required. More...
Ctrl_status	mem_read_capacity (U8 lun, U32 *u32_nb_sector)
	Returns the address of the last valid sector (512 bytes) in the memory. More...
U8	mem_sector_size (U8 lun)
	Returns the size of the physical sector. More...
bool	mem_unload (U8 lun, bool unload)
	Unload/load the medium. More...
bool	mem_wr_protect (U8 lun)
	Returns the write-protection state of the memory. More...
bool	mem_removal (U8 lun)
	Tells whether the memory is removable. More...
const char *	mem_name (U8 lun)
	Returns a pointer to the LUN name. More...

MEM <-> USB Interface
Ctrl_status	memory_2_usb (U8 lun, U32 addr, U16 nb_sector)
	Transfers data from the memory to USB. More...
Ctrl_status	usb_2_memory (U8 lun, U32 addr, U16 nb_sector)
	Transfers data from USB to the memory. More...

#define LUN_ID_0   (0)

First static LUN.

Referenced by get_cur_lun().

#define LUN_ID_1   (LUN_ID_0 + LUN_0)

#define LUN_ID_2   (LUN_ID_1 + LUN_1)

#define LUN_ID_3   (LUN_ID_2 + LUN_2)

#define LUN_ID_4   (LUN_ID_3 + LUN_3)

#define LUN_ID_5   (LUN_ID_4 + LUN_4)

#define LUN_ID_6   (LUN_ID_5 + LUN_5)

#define LUN_ID_7   (LUN_ID_6 + LUN_6)

#define LUN_ID_USB   (MAX_LUN)

First dynamic LUN (USB host mass storage).

Referenced by mem_read_capacity(), mem_sector_size(), mem_test_unit_ready(), mem_unload(), and mem_wr_protect().

#define MAX_LUN   (LUN_ID_7 + LUN_7)

Number of static LUNs.

Referenced by get_nb_lun(), mem_name(), mem_read_capacity(), mem_removal(), mem_sector_size(), mem_test_unit_ready(), mem_unload(), mem_wr_protect(), memory_2_usb(), and usb_2_memory().

#define SECTOR_SIZE   512

Referenced by nand_flash_read_capacity(), nand_flash_usb_read_10(), and nand_flash_usb_write_10().

enum Ctrl_status

Status returned by CTRL_ACCESS interfaces.

Enumerator
CTRL_GOOD	Success, memory ready.
CTRL_FAIL	An error occurred.
CTRL_NO_PRESENT	Memory unplugged.
CTRL_BUSY	Memory not initialized or changed.

bool ctrl_access_init

(

void

)

Initializes the LUN access locker.

Returns

true if the locker was successfully initialized, else false.

References ctrl_access_semphr.

Referenced by main().

static bool ctrl_access_lock ( void  )

static

Locks accesses to LUNs.

Returns

true if the access was successfully locked, else false.

References ctrl_access_semphr, and xSemaphoreTake.

U8 get_cur_lun

(

void

)

Returns the current LUN.

Returns

Current LUN.

Todo:

Implement.

References LUN_ID_0.

U8 get_nb_lun

(

void

)

Returns the number of LUNs.

Returns

Number of LUNs in the system.

References Ctrl_access_lock, Ctrl_access_unlock, Lun_usb_get_lun, and MAX_LUN.

const char* mem_name

(

U8

lun

)

Returns a pointer to the LUN name.

Parameters

lun	Logical Unit Number.

Returns

Pointer to the LUN name string.

References ENABLE, lun_desc, LUN_USB, LUN_USB_NAME, MAX_LUN, name, and UNUSED.

Referenced by udi_msc_spc_inquiry().

Ctrl_status mem_read_capacity	(	U8	lun,
		U32 *	u32_nb_sector
	)

Returns the address of the last valid sector (512 bytes) in the memory.

Parameters

lun	Logical Unit Number.
u32_nb_sector	Pointer to the address of the last valid sector.

Returns

Status.

References Ctrl_access_lock, Ctrl_access_unlock, CTRL_FAIL, lun_desc, LUN_ID_USB, Lun_usb_read_capacity, MAX_LUN, and read_capacity.

Referenced by udi_msc_sbc_read_capacity().

bool mem_removal

(

U8

lun

)

Tells whether the memory is removable.

Parameters

lun	Logical Unit Number.

Returns

true if the memory is removable, else false.

References Ctrl_access_lock, Ctrl_access_unlock, lun_desc, Lun_usb_removal, MAX_LUN, removal, and UNUSED.

Referenced by udi_msc_spc_inquiry().

U8 mem_sector_size

(

U8

lun

)

Returns the size of the physical sector.

Parameters

lun	Logical Unit Number.

Returns

Sector size (unit: 512 bytes).

References Ctrl_access_lock, Ctrl_access_unlock, ENABLE, LUN_ID_USB, LUN_USB, Lun_usb_read_sector_size, and MAX_LUN.

Ctrl_status mem_test_unit_ready

(

U8

lun

)

Tests the memory state and initializes the memory if required.

The TEST UNIT READY SCSI primary command allows an application client to poll a LUN until it is ready without having to allocate memory for returned data.

This command may be used to check the media status of LUNs with removable media.

Parameters

lun	Logical Unit Number.

Returns

Status.

References Ctrl_access_lock, Ctrl_access_unlock, CTRL_FAIL, lun_desc, LUN_ID_USB, Lun_usb_test_unit_ready, MAX_LUN, and test_unit_ready.

Referenced by udi_msc_spc_testunitready_global().

bool mem_unload	(	U8	lun,
		bool	unload
	)

Unload/load the medium.

Parameters

lun	Logical Unit Number.
unload	true to unload the medium, false to load the medium.

Returns

true if unload/load success, else false.

References Ctrl_access_lock, Ctrl_access_unlock, ENABLE, lun_desc, LUN_ID_USB, LUN_USB, MAX_LUN, unload, and UNUSED.

Referenced by udi_msc_sbc_start_stop().

bool mem_wr_protect

(

U8

lun

)

Returns the write-protection state of the memory.

Parameters

lun	Logical Unit Number.

Returns

true if the memory is write-protected, else false.

Note

Only used by removable memories with hardware-specific write protection.

References Ctrl_access_lock, Ctrl_access_unlock, lun_desc, LUN_ID_USB, Lun_usb_wr_protect, MAX_LUN, and wr_protect.

Referenced by udi_msc_sbc_trans(), and udi_msc_spc_mode_sense().

Ctrl_status memory_2_usb	(	U8	lun,
		U32	addr,
		U16	nb_sector
	)

Transfers data from the memory to USB.

Parameters

lun	Logical Unit Number.
addr	Address of first memory sector to read.
nb_sector	Number of sectors to transfer.

Returns

Status.

References Ctrl_access_lock, Ctrl_access_unlock, CTRL_FAIL, lun_desc, MAX_LUN, memory_start_read_action, memory_stop_read_action, and usb_read_10.

Referenced by udi_msc_process_trans().

Ctrl_status usb_2_memory	(	U8	lun,
		U32	addr,
		U16	nb_sector
	)

Transfers data from USB to the memory.

Parameters

lun	Logical Unit Number.
addr	Address of first memory sector to write.
nb_sector	Number of sectors to transfer.

Returns

Status.

References Ctrl_access_lock, Ctrl_access_unlock, CTRL_FAIL, lun_desc, MAX_LUN, memory_start_write_action, memory_stop_write_action, and usb_write_10.

Referenced by udi_msc_process_trans().