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by Juho Eskeli
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AT45 Class Reference
Interface to the Atmel AT45 series Dataflash with Serial Interface (SPI)
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#include <AT45.h >
AT45 (SPI &spi, PinName ncs) Create an instance of the AT45 connected to specfied SPI pins, with the specified address. char read_byte (int address) Read a byte. int read_page (char *data, int page) Read a page. int read_block (char *data, int block) Read a block (from 1 dimension array). int read_block (char *data[], int block) Read a block (from 2 dimension array). void write_byte (int address, char data) Write a byte. int write_page (char *data, int page) Write a page. int write_block (char *data, int block) Write a block (from 1 dimension array). int write_block (char *data[], int block) Write a block (from 2 dimension array). int FAT_read (char *data, int page) FAT Read (512 bits). int FAT_write (char *data, int page) FAT Write (512bits). void chip_erase (void) Function to erase the entire chip. void block_erase (int block) Function to erase the selected block. void page_erase (int page) Function to erase the selected block. int device_size (void) Device size in mbits. int pages (void) Pages in flash. int pagesize (void) Page size. void set_pageszie_to_binary (void) Function to set the page size to binary. int blocks (void) blocks in flash. int id (void) ID of the device. int status (void) Status register. void busy (void) busy ?. void deep_power_down (bool onoff) Deep Power Down. bool is_it_awake (void) Is the device deep power down.
Detailed Description
Interface to the Atmel AT45 series Dataflash with Serial Interface (SPI)
Using the driver:
remenber to setup SPI in main routine.
remenber to setup Chipselect in main routine.
remenber to use FAT functions set pagesize to binary.
Limitations of using this driver:
can't use lockdown functions.
can't use protections functions.
can't use security functions.
Definition at line 56 of file AT45.h .
Constructor & Destructor Documentation
AT45 (
SPI &
spi ,
PinName
ncs
)
Create an instance of the AT45 connected to specfied SPI pins, with the specified address.
Parameters:
spi The mbed SPI instance (make in main routine) nCs The SPI chip select pin.
Definition at line 31 of file AT45.cpp .
Member Function Documentation
void block_erase
(
int
block )
Function to erase the selected block.
Parameters:
block The selected block to erase.
Definition at line 496 of file AT45.cpp .
blocks in flash.
Returns: Numbers af blocks. Definition at line 622 of file AT45.cpp .
busy ?.
Function will want to the device is not busy.
Definition at line 651 of file AT45.cpp .
Function to erase the entire chip.
Issue: In a certain percentage of units, the chip erase feature may not function correctly and may adversely affect device operation. Therefore, it is recommended that the chip erase commands (opcodes C7H, 94H, 80H, and 9AH) not be used. Workaround: Use block erase (opcode 50H) as an alternative. The block erase function is not affected by the chip erase issue. Resolution: The chip erase feature may be fixed with a new revision of the device. Please contact Atmel for the estimated availability of devices with the fix.
Definition at line 480 of file AT45.cpp .
void deep_power_down
(
bool
onoff )
Deep Power Down.
Remenber that you have to want 35uS after the wake up to use the device.
Parameters:
True = Activate and False = Wake Up.
Definition at line 656 of file AT45.cpp .
Device size in mbits.
Returns: device size. Definition at line 588 of file AT45.cpp .
int FAT_read
(
char *
data ,
int
page
)
FAT Read (512 bits).
Remenber to set page size to binary.
Parameters:
data The data is pointer to a userdefined array that the page is read into. page The page number of the page to read (0 to device page size).
Returns: Returns "0". Definition at line 268 of file AT45.cpp .
int FAT_write
(
char *
data ,
int
page
)
FAT Write (512bits).
Remenber to set page size to binary.
Parameters:
data The data is pointer to a userdefined array that holds the data to write into. page The page number of the page to write into (0 to device page size).
Returns: Returns "0" or "-1" for error. Definition at line 373 of file AT45.cpp .
ID of the device.
Returns: Manufacturer, Family and Density code. Definition at line 628 of file AT45.cpp .
bool is_it_awake
(
void
)
Is the device deep power down.
Returns: True = Activate and False = Awake. Definition at line 706 of file AT45.cpp .
void page_erase
(
int
page )
Function to erase the selected block.
Parameters:
page The number of the page to erase.
Definition at line 542 of file AT45.cpp .
Pages in flash.
Returns: Numbers af pages. Definition at line 594 of file AT45.cpp .
Page size.
for 2-8 Mbits 256 or 264 for 16-32 Mbits 512 or 528 for 64 Mbits 1024 or 1056
Returns: Page size. Definition at line 600 of file AT45.cpp .
int read_block
(
char *
data ,
int
block
)
Read a block (from 1 dimension array).
Parameters:
data The data is pointer to a userdefined array that holds 4096 bytes of the data that is read into. block The block number of the block to read (0 to device block size).
Returns: Returns "0" or "-1" for error. Definition at line 102 of file AT45.cpp .
int read_block
(
char *
data [],
int
block
)
Read a block (from 2 dimension array).
Then using 2 dimension array, the array shall have a starting point like "read_block(data[0],0)"
Parameters:
data The data is pointer to a userdefined array that holds 8 x 512 bytes of the data that is read into. block The block number of the block to read (0 to device block size).
Returns: Returns "0" or "-1" for error. Definition at line 125 of file AT45.cpp .
char read_byte
(
int
address )
Read a byte.
Parameters:
address The address of the byte to read.
Returns: The data in the byte. Definition at line 45 of file AT45.cpp .
int read_page
(
char *
data ,
int
page
)
Read a page.
Parameters:
data The data is pointer to a userdefined array that the page is read into. page The page number of the page to read (0 to device page size).
Returns: Returns "0" or "-1" for error. Definition at line 51 of file AT45.cpp .
void set_pageszie_to_binary
(
void
)
Function to set the page size to binary.
Remenber is a one-time programmable configuration. Remenber to total power down after the functions has been run.
Definition at line 606 of file AT45.cpp .
Status register.
Returns: The status register. Definition at line 640 of file AT45.cpp .
int write_block
(
char *
data ,
int
block
)
Write a block (from 1 dimension array).
Parameters:
data The data is pointer to a userdefined array that holds 4096 bytes of the data to write into. block The block number of the block to write into (0 to device block size).
Returns: Returns "0" or "-1" for error. Definition at line 217 of file AT45.cpp .
int write_block
(
char *
data [],
int
block
)
Write a block (from 2 dimension array).
Then using 2 dimension array, the array shall have a starting point like "write_block(data[0],0)"
Parameters:
data The data is pointer to a userdefined array that holds 8 x 512 bytes of the data to write into (remenber it has to be a 2 dimension array). block The block number of the block to write into (0 to device block size).
Returns: Returns "0" or "-1" for error. Definition at line 241 of file AT45.cpp .
void write_byte
(
int
address ,
char
data
)
Write a byte.
Parameters:
address The address to where the data is storage in the flash. data The data to write into the flash.
Definition at line 154 of file AT45.cpp .
int write_page
(
char *
data ,
int
page
)
Write a page.
Parameters:
data The data is pointer to a userdefined array that holds the data to write into. page The page number of the page to write into (0 to device page size).
Returns: Returns "0" or "-1" for error. Definition at line 164 of file AT45.cpp .
Juho Eskeli
1.7.2