at45dbx_mem.c File Reference

CTRL_ACCESS interface for the AT45DBX data flash driver.

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include "conf_access.h"
#include "conf_at45dbx.h"
#include "at45dbx.h"
#include "at45dbx_mem.h"
#include "udi_msc.h"

Functions
MEM <-> USB Interface
Ctrl_status	at45dbx_usb_read_10 (U32 addr, U16 nb_sector)
	Transfers data from the memory to USB. More...
Ctrl_status	at45dbx_usb_write_10 (U32 addr, U16 nb_sector)
	Transfers data from USB to the memory. More...
MEM <-> RAM Interface
Ctrl_status	at45dbx_df_2_ram (U32 addr, void *ram)
	Copies 1 data sector from the memory to RAM. More...
Ctrl_status	at45dbx_ram_2_df (U32 addr, const void *ram)
	Copies 1 data sector from RAM to the memory. More...

Variables
static uint8_t	sector_buf [AT45DBX_SECTOR_SIZE]
	Sector buffer. More...

Control Interface
static bool	b_at45dbx_unloaded = false
Ctrl_status	at45dbx_test_unit_ready (void)
	Tests the memory state and initializes the memory if required. More...
Ctrl_status	at45dbx_read_capacity (U32 *u32_nb_sector)
	Returns the address of the last valid sector in the memory. More...
bool	at45dbx_wr_protect (void)
	Returns the write-protection state of the memory. More...
bool	at45dbx_removal (void)
	Tells whether the memory is removable. More...
bool	at45dbx_unload (bool unload)
	Unload/load the memory. More...

Ctrl_status at45dbx_df_2_ram	(	U32	addr,
		void *	ram
	)

Copies 1 data sector from the memory to RAM.

Parameters

addr	Address of first memory sector to read.
ram	Pointer to RAM buffer to write.

Returns

Status.

References AT45DBX_PAGE_SIZE, at45dbx_read_close(), at45dbx_read_sector_open(), at45dbx_read_sector_to_ram(), CTRL_FAIL, and CTRL_GOOD.

Ctrl_status at45dbx_ram_2_df	(	U32	addr,
		const void *	ram
	)

Copies 1 data sector from RAM to the memory.

Parameters

addr	Address of first memory sector to write.
ram	Pointer to RAM buffer to read.

Returns

Status.

References AT45DBX_PAGE_SIZE, at45dbx_write_close(), at45dbx_write_sector_from_ram(), at45dbx_write_sector_open(), CTRL_FAIL, and CTRL_GOOD.

Ctrl_status at45dbx_read_capacity

(

U32 *

u32_nb_sector

)

Returns the address of the last valid sector in the memory.

Parameters

u32_nb_sector

Pointer to the address of the last valid sector.

Returns

Status.

References CTRL_GOOD.

bool at45dbx_removal

(

void

)

Tells whether the memory is removable.

Returns

true if the memory is removable, else false.

Ctrl_status at45dbx_test_unit_ready

(

void

)

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.

Returns

Status.

References at45dbx_mem_check(), b_at45dbx_unloaded, CTRL_GOOD, and CTRL_NO_PRESENT.

bool at45dbx_unload

(

bool

unload

)

Unload/load the memory.

Parameters

unload

true to unload, false to load.

Returns

true if the operation is success, else false.

References b_at45dbx_unloaded.

Ctrl_status at45dbx_usb_read_10	(	U32	addr,
		U16	nb_sector
	)

Transfers data from the memory to USB.

Parameters

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

Returns

Status.

References at45dbx_read_close(), at45dbx_read_sector_open(), at45dbx_read_sector_to_ram(), AT45DBX_SECTOR_BITS, AT45DBX_SECTOR_SIZE, CTRL_FAIL, CTRL_GOOD, NULL, sector_buf, and udi_msc_trans_block().

Ctrl_status at45dbx_usb_write_10	(	U32	addr,
		U16	nb_sector
	)

Transfers data from USB to the memory.

Parameters

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

Returns

Status.

References AT45DBX_SECTOR_BITS, AT45DBX_SECTOR_SIZE, at45dbx_write_close(), at45dbx_write_sector_from_ram(), at45dbx_write_sector_open(), CTRL_FAIL, CTRL_GOOD, NULL, sector_buf, and udi_msc_trans_block().

bool at45dbx_wr_protect

(

void

)

Returns the write-protection state of the memory.

Returns

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

Note

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

bool b_at45dbx_unloaded = false

static

Referenced by at45dbx_test_unit_ready(), and at45dbx_unload().

uint8_t sector_buf[AT45DBX_SECTOR_SIZE]

static

Sector buffer.

Referenced by at45dbx_usb_read_10(), at45dbx_usb_write_10(), and stream_mem_to_mem().