This is a driver for the AT45dbX series DataFlash memories.

It provides functions for initialization, read and write operations at byte or sector level. The DataFlash driver can be used either with SPI Master Service or USART_SPI Service. The SPI service configuration depends on AT45DBX_USES_SPI_MASTER_SERVICE or AT45DBX_USES_USART_SPI_SERVICE defined in conf_at45dbx.h.

Dependencies

This driver depends on the following modules:

Serial Peripheral Interface (SPI) for SPI master interface.

Macros
#define	AT45DBX_SECTOR_BITS 9
	Number of bits for addresses within logical sectors of file system. More...

#define	AT45DBX_SECTOR_SIZE (1 << AT45DBX_SECTOR_BITS)
	Logical sector size of file system in bytes. More...

Control Functions
static void	at45dbx_chipselect_df (uint8_t memidx, bool bSelect)
	Selects or unselects a DF memory. More...

static void	at45dbx_wait_ready (void)

Available AT45DBX Sizes
Number of address bits of available AT45DBX data flash memories. Note All memories from page sizes of 256 bytes to 1024 bytes are supported.
#define	AT45DBX_500KB 19

#define	AT45DBX_1MB 20

#define	AT45DBX_2MB 21

#define	AT45DBX_4MB 22

#define	AT45DBX_8MB 23

Control Functions
bool	at45dbx_init (void)
	Initializes the data flash controller and the SPI channel by which the DF is controlled. More...

bool	at45dbx_mem_check (void)
	Performs a memory check on all DataFlash memories. More...

bool	at45dbx_read_sector_open (uint32_t sector)
	Opens a DataFlash memory in read mode at a given sector. More...

bool	at45dbx_read_byte_open (uint32_t ad)
	Opens a DataFlash memory in read mode at a given byte address. More...

void	at45dbx_read_close (void)
	Unselects the current DataFlash memory. More...

bool	at45dbx_write_sector_open (uint32_t sector)
	This function opens a DataFlash memory in write mode at a given sector. More...

bool	at45dbx_write_byte_open (uint32_t ad)
	This function opens a DataFlash memory in write mode at a given address. More...

void	at45dbx_write_close (void)
	Fills the end of the current logical sector and launches page programming. More...

Single-Byte Access Functions
uint8_t	at45dbx_read_byte (void)
	Performs a single byte read from DataFlash memory. More...

bool	at45dbx_write_byte (uint8_t b)
	Performs a single byte write to DataFlash memory. More...

Single-Sector Access Functions
bool	at45dbx_read_sector_to_ram (void *ram)
	Reads one DataFlash sector to a RAM buffer. More...

bool	at45dbx_write_sector_from_ram (const void *ram)
	Writes one DataFlash sector from a RAM buffer. More...

Functions to connect the DataFlash driver with the SPI Multiple-Sector Access Functions
void	at45dbx_spi_init (void)
	Initialize SPI external resource for AT45dbx DataFlash driver. More...

void	at45dbx_spi_select_device (uint8_t mem_id)
	Select one external DataFlash component. More...

void	at45dbx_spi_deselect_device (uint8_t mem_id)
	Unselect one external DataFlash component. More...

void	at45dbx_spi_write_byte (uint8_t data)
	Send one byte to the DataFlash. More...

void	at45dbx_spi_read_byte (uint8_t *data)
	Get one byte (read) from the DataFlash. More...

void	at45dbx_spi_read_packet (void const *data, size_t len)
	Receive a sequence of bytes from a DataFlash. More...

void	at45dbx_spi_write_packet (void const *data, size_t len)
	Send a sequence of bytes to a DataFlash from. More...

#define AT45DBX_1MB 20

#define AT45DBX_2MB 21

#define AT45DBX_4MB 22

#define AT45DBX_500KB 19

#define AT45DBX_8MB 23

#define AT45DBX_SECTOR_BITS 9

Number of bits for addresses within logical sectors of file system.

Referenced by at45dbx_read_byte(), at45dbx_read_sector_open(), at45dbx_usb_read_10(), at45dbx_usb_write_10(), and at45dbx_write_sector_open().

#define AT45DBX_SECTOR_SIZE (1 << AT45DBX_SECTOR_BITS)

Logical sector size of file system in bytes.

Referenced by at45dbx_usb_read_10(), at45dbx_usb_write_10(), and at45dbx_write_sector_from_ram().

static void at45dbx_chipselect_df	(	uint8_t	memidx,
		bool	bSelect
	)

static

Selects or unselects a DF memory.

Parameters

memidx	Memory ID of DF to select or unselect.
bSelect	Boolean indicating whether the DF memory has to be selected.

References at45dbx_spi_deselect_device(), and at45dbx_spi_select_device().

Referenced by at45dbx_mem_check(), at45dbx_read_byte(), at45dbx_read_byte_open(), at45dbx_read_close(), at45dbx_wait_ready(), at45dbx_write_byte(), at45dbx_write_byte_open(), at45dbx_write_close(), and at45dbx_write_sector_from_ram().

bool at45dbx_init ( void )

Initializes the data flash controller and the SPI channel by which the DF is controlled.

Return values

true	Success.
false	Failure.

bool at45dbx_mem_check ( void )

Performs a memory check on all DataFlash memories.

Return values

true	Success.
false	Failure.

References at45dbx_chipselect_df(), AT45DBX_CMDC_RD_STATUS_REG, AT45DBX_MSK_DENSITY, at45dbx_spi_read_byte(), at45dbx_spi_write_byte(), and status.

Referenced by at45dbx_test_unit_ready().

uint8_t at45dbx_read_byte ( void )

Performs a single byte read from DataFlash memory.

Returns: The read byte.

Note: First call must be preceded by a call to the at45dbx_read_byte_open function.

References at45dbx_busy, AT45DBX_CHIP_UNSELECT, at45dbx_chipselect_df(), at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_BYTE, at45dbx_read_sector_open(), AT45DBX_SECTOR_BITS, at45dbx_spi_read_byte(), data, and Rd_bitfield.

bool at45dbx_read_byte_open ( uint32_t ad )

Opens a DataFlash memory in read mode at a given byte address.

Parameters

ad	Start address.

Return values

true	Success.
false	Failure.

References addr, at45dbx_busy, at45dbx_check_address(), at45dbx_chipselect_df(), AT45DBX_CMDA_RD_PAGE, at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_BYTE, AT45DBX_MSK_PTR_PAGE, at45dbx_spi_write_byte(), at45dbx_wait_ready(), LSB0W, LSB1W, LSB2W, and Rd_bitfield.

Referenced by at45dbx_read_sector_open().

void at45dbx_read_close ( void )

Unselects the current DataFlash memory.

References at45dbx_busy, AT45DBX_CHIP_UNSELECT, at45dbx_chipselect_df(), and at45dbx_gl_ptr_mem.

Referenced by at45dbx_df_2_ram(), and at45dbx_usb_read_10().

bool at45dbx_read_sector_open ( uint32_t sector )

Opens a DataFlash memory in read mode at a given sector.

Parameters

sector Start sector.

Return values

true	Success.
false	Failure.

Note: Sector may be page-unaligned (depending on the DataFlash page size).

References at45dbx_check_address(), at45dbx_read_byte_open(), and AT45DBX_SECTOR_BITS.

Referenced by at45dbx_df_2_ram(), at45dbx_read_byte(), and at45dbx_usb_read_10().

bool at45dbx_read_sector_to_ram ( void * ram )

Reads one DataFlash sector to a RAM buffer.

Data flow is: DataFlash -> RAM.

Parameters

ram	Pointer to RAM buffer.

Return values

true	Success.
false	Failure.

Note: First call must be preceded by a call to the at45dbx_read_sector_open function.

Referenced by at45dbx_df_2_ram(), and at45dbx_usb_read_10().

void at45dbx_spi_deselect_device ( uint8_t mem_id )

inline

Unselect one external DataFlash component.

Parameters

mem_id The DataFlash index number.

References AT45DBX_DESELECT, and MREPEAT.

Referenced by at45dbx_chipselect_df().

void at45dbx_spi_init ( void )

inline

Initialize SPI external resource for AT45dbx DataFlash driver.

This function initializes the DataFlash component as well as the SPI service the memory is connected to.

Precondition

The conf_at45dbx.h file should provide the following information

Selection of the SPI service the DataFlash is connected (AT45DBX_USES_SPI_MASTER_SERVICE or AT45DBX_USES_USART_SPI_SERVICE)

AT45DBX_MEM_SIZE: The DataFlash type the driver is connected to.
AT45DBX_MEM_CNT: The number of DataFlash components (number of chipselect)
AT45DBX_SPI_MODULE: The name of the SPI module used by the DataFlash driver
AT45DBX_SPI_MASTER_SPEED: The SPI bus speed.

References spi_enable(), spi_is_enabled(), spi_master_init(), and usart_spi_init().

void at45dbx_spi_read_byte ( uint8_t * data )

inline

Get one byte (read) from the DataFlash.

Returns: The received byte.

Precondition: The DataFlash should be selected first using at45dbx_spi_select_device

References at45dbx_drv_read_packet.

Referenced by at45dbx_mem_check(), at45dbx_read_byte(), and at45dbx_wait_ready().

void at45dbx_spi_read_packet	(	void const *	data,
		size_t	len
	)

inline

Receive a sequence of bytes from a DataFlash.

Parameters

data	data buffer to read
len	Length of data

Precondition: The DataFlash should be selected first using at45dbx_spi_select_device

References at45dbx_drv_read_packet.

void at45dbx_spi_select_device ( uint8_t mem_id )

inline

Select one external DataFlash component.

Parameters

mem_id The DataFlash index number.

References AT45DBX_SELECT, and MREPEAT.

Referenced by at45dbx_chipselect_df().

void at45dbx_spi_write_byte ( uint8_t data )

inline

Send one byte to the DataFlash.

Parameters

data	The data byte to send.

Precondition: The DataFlash should be selected first using at45dbx_spi_select_device

References at45dbx_drv_write_packet.

Referenced by at45dbx_mem_check(), at45dbx_read_byte_open(), at45dbx_wait_ready(), at45dbx_write_byte(), at45dbx_write_byte_open(), and at45dbx_write_close().

void at45dbx_spi_write_packet	(	void const *	data,
		size_t	len
	)

inline

Send a sequence of bytes to a DataFlash from.

Parameters

data	data buffer to write
len	Length of data

Precondition: The DataFlash should be selected first using at45dbx_spi_select_device

References at45dbx_drv_write_packet.

Referenced by at45dbx_write_sector_from_ram().

static void at45dbx_wait_ready ( void )

static

References AT45DBX_BUSY, at45dbx_chipselect_df(), AT45DBX_CMDC_RD_STATUS_REG, at45dbx_gl_ptr_mem, AT45DBX_MSK_BUSY, at45dbx_spi_read_byte(), at45dbx_spi_write_byte(), and status.

Referenced by at45dbx_read_byte_open(), and at45dbx_write_byte_open().

bool at45dbx_write_byte ( uint8_t b )

Performs a single byte write to DataFlash memory.

Parameters

b	The byte to write.

Return values

true	Success.
false	Failure.

Note: First call must be preceded by a call to the at45dbx_write_byte_open function.

References at45dbx_busy, AT45DBX_CHIP_UNSELECT, at45dbx_chipselect_df(), at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_BYTE, at45dbx_spi_write_byte(), at45dbx_write_byte_open(), and Rd_bitfield.

bool at45dbx_write_byte_open ( uint32_t ad )

This function opens a DataFlash memory in write mode at a given address.

Parameters

ad	Start address.

Return values

true	Success.
false	Failure.

References addr, at45dbx_busy, at45dbx_check_address(), at45dbx_chipselect_df(), AT45DBX_CMDB_PR_PAGE_TH_BUF1, AT45DBX_CMDB_XFR_PAGE_TO_BUF1, at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_BYTE, AT45DBX_MSK_PTR_PAGE, at45dbx_spi_write_byte(), at45dbx_wait_ready(), LSB0W, LSB1W, LSB2W, and Rd_bitfield.

Referenced by at45dbx_write_byte(), at45dbx_write_sector_from_ram(), and at45dbx_write_sector_open().

void at45dbx_write_close ( void )

Fills the end of the current logical sector and launches page programming.

References at45dbx_busy, AT45DBX_CHIP_UNSELECT, at45dbx_chipselect_df(), at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_SECTOR, at45dbx_spi_write_byte(), and Rd_bitfield.

Referenced by at45dbx_ram_2_df(), and at45dbx_usb_write_10().

bool at45dbx_write_sector_from_ram ( const void * ram )

Writes one DataFlash sector from a RAM buffer.

Data flow is: RAM -> DataFlash.

Parameters

ram	Pointer to RAM buffer.

Return values

true	Success.
false	Failure.

Note: First call must be preceded by a call to the at45dbx_write_sector_open function.

References at45dbx_busy, AT45DBX_CHIP_UNSELECT, at45dbx_chipselect_df(), at45dbx_gl_ptr_mem, AT45DBX_MSK_PTR_BYTE, AT45DBX_PAGE_SIZE, AT45DBX_SECTOR_SIZE, at45dbx_spi_write_packet(), at45dbx_write_byte_open(), and Rd_bitfield.

Referenced by at45dbx_ram_2_df(), and at45dbx_usb_write_10().

bool at45dbx_write_sector_open ( uint32_t sector )

This function opens a DataFlash memory in write mode at a given sector.

Parameters

sector Start sector.

Return values

true	Success.
false	Failure.

Note: Sector may be page-unaligned (depending on the DF page size).; If AT45DBX_PAGE_SIZE > AT45DBX_SECTOR_SIZE, page content is first loaded in buffer to then be partially updated by write byte or write sector functions.

References at45dbx_check_address(), AT45DBX_SECTOR_BITS, and at45dbx_write_byte_open().

Referenced by at45dbx_ram_2_df(), and at45dbx_usb_write_10().

Microchip® Advanced Software Framework

Dependencies

Macros

Control Functions

Available AT45DBX Sizes

Control Functions

Single-Byte Access Functions

Single-Sector Access Functions

Functions to connect the DataFlash driver with the SPI Multiple-Sector Access Functions