at45db.c File Reference


Detailed Description

Routines for Atmel AT45 serial dataflash memory chips.

 *
 * $Log: at45db.c,v $
 * Revision 1.4  2008/02/15 17:10:43  haraldkipp
 * At45dbPageErase selected the wrong bank. Fixed. Parameter pgn (page number)
 * of At45dbPageWrite() changed from unsigned int to unsigned long.
 * New routines At45dbPages() and At45dbPageSize() allow to determine the
 * chip's layout.
 *
 * Revision 1.3  2007/08/17 10:45:21  haraldkipp
 * Enhanced documentation.
 *
 * Revision 1.2  2006/10/08 16:48:09  haraldkipp
 * Documentation fixed
 *
 * Revision 1.1  2006/09/29 12:41:55  haraldkipp
 * Added support for AT45 serial DataFlash memory chips. Currently limited
 * to AT91 builds.
 *
 *
 * 

Definition in file at45db.c.

Go to the source code of this file.

AT45 DataFlash Commands

#define DFCMD_CONT_READ_LF   0x03
 Continuos read (low frequency).
#define DFCMD_CONT_READ_HF   0x0B
 Continuos read (high frequency).
#define DFCMD_BLOCK_ERASE   0x50
 Block erase.
#define DFCMD_SECTOR_ERASE   0x7C
 Sector erase.
#define DFCMD_PAGE_ERASE   0x81
 Page erase.
#define DFCMD_BUF1_PROG   0x82
 Main memory page program through buffer 1.
#define DFCMD_BUF1_FLASH   0x83
 Buffer 1 flash with page erase.
#define DFCMD_BUF1_WRITE   0x84
 Buffer 1 write.
#define DFCMD_BUF2_PROG   0x85
 Main memory page program through buffer 2.
#define DFCMD_BUF2_FLASH   0x86
 Buffer 2 flash with page erase.
#define DFCMD_BUF2_WRITE   0x87
 Buffer 2 write.
#define DFCMD_BUF1_FLASH_NE   0x88
 Buffer 1 flash without page erase.
#define DFCMD_BUF2_FLASH_NE   0x89
 Buffer 2 flash without page erase.
#define DFCMD_CHIP_ERASE   0xC7
 Chip erase.
#define DFCMD_BUF1_READ_LF   0xD1
 Buffer 1 read (low frequency).
#define DFCMD_READ_PAGE   0xD2
 Read main memory page.
#define DFCMD_BUF2_READ_LF   0xD3
 Buffer 2 read (low frequency).
#define DFCMD_BUF1_READ   0xD4
 Buffer 1 read.
#define DFCMD_BUF2_READ   0xD6
 Buffer 2 read.
#define DFCMD_READ_STATUS   0xD7
 Read status register.
#define DFCMD_CONT_READ   0xE8
 Continuos read (legacy).

Defines

#define MAX_AT45_DEVICES   1
#define MAX_AT45_CMDLEN   8
#define AT45_CONF_DFSPI   SPI0_BASE
#define AT45_CONF_DFPCS   1
#define AT45_ERASE_WAIT   3000
#define AT45_CHIP_ERASE_WAIT   50000
#define AT45_WRITE_POLLS   1000
#define AT45DB_AT91

Functions

int At45dbSendCmd (int dd, u_char op, u_long parm, int len, CONST void *tdata, void *rdata, int datalen)
 Send DataFlash command.
u_char At45dbGetStatus (int dd)
int At45dbWaitReady (int dd, u_long tmo, int poll)
 Wait until flash memory cycle finished.
int At45dbInit (u_int spibas, u_int spipcs)
 Initialize dataflash at specified interface and chip select.
int At45dbPageErase (int dd, u_long pgn)
 Erase sector at the specified offset.
int At45dbChipErase (void)
 Erase entire flash memory chip.
int At45dbPageRead (int dd, u_long pgn, void *data, u_int len)
 Read data from flash memory.
int At45dbPageWrite (int dd, u_long pgn, CONST void *data, u_int len)
 Write data into flash memory.
u_long At45dbPages (int dd)
u_int At45dbPageSize (int dd)
u_long At45dbParamPage (void)
int At45dbParamSize (void)
 Get size of configuration area.
int At45dbParamRead (u_int pos, void *data, u_int len)
 Load configuration parameters from flash memory.
int At45dbParamWrite (u_int pos, CONST void *data, u_int len)
 Store configuration parameters in flash memory.

Variables

AT45_DEVTAB at45_devt []
 Table of known Dataflash types.


Define Documentation

#define MAX_AT45_DEVICES   1

Definition at line 74 of file at45db.c.

Referenced by At45dbInit().

#define MAX_AT45_CMDLEN   8

Definition at line 78 of file at45db.c.

Referenced by At45dbSendCmd().

#define AT45_CONF_DFSPI   SPI0_BASE

Definition at line 82 of file at45db.c.

Referenced by At45dbParamSize().

#define AT45_CONF_DFPCS   1

Definition at line 86 of file at45db.c.

Referenced by At45dbParamSize().

#define AT45_ERASE_WAIT   3000

Definition at line 90 of file at45db.c.

#define AT45_CHIP_ERASE_WAIT   50000

Definition at line 94 of file at45db.c.

#define AT45_WRITE_POLLS   1000

Definition at line 98 of file at45db.c.

Referenced by At45dbPageWrite().

#define DFCMD_CONT_READ_LF   0x03

Continuos read (low frequency).

Reads a continous stream in low speed mode. Automatically switches to the the page and wraps to the first page after the last has been read. Note, that the data buffers are not used for this operation.

Definition at line 111 of file at45db.c.

#define DFCMD_CONT_READ_HF   0x0B

Continuos read (high frequency).

Reads a continous stream in high speed mode. Automatically switches to the the page and wraps to the first page after the last has been read. Note, that the data buffers are not used for this operation.

Definition at line 118 of file at45db.c.

#define DFCMD_BLOCK_ERASE   0x50

Block erase.

Definition at line 121 of file at45db.c.

#define DFCMD_SECTOR_ERASE   0x7C

Sector erase.

Definition at line 124 of file at45db.c.

#define DFCMD_PAGE_ERASE   0x81

Page erase.

Definition at line 127 of file at45db.c.

Referenced by At45dbPageErase().

#define DFCMD_BUF1_PROG   0x82

Main memory page program through buffer 1.

Definition at line 130 of file at45db.c.

#define DFCMD_BUF1_FLASH   0x83

Buffer 1 flash with page erase.

Definition at line 133 of file at45db.c.

Referenced by At45dbPageWrite().

#define DFCMD_BUF1_WRITE   0x84

Buffer 1 write.

Definition at line 136 of file at45db.c.

Referenced by At45dbPageWrite().

#define DFCMD_BUF2_PROG   0x85

Main memory page program through buffer 2.

Definition at line 139 of file at45db.c.

#define DFCMD_BUF2_FLASH   0x86

Buffer 2 flash with page erase.

Definition at line 142 of file at45db.c.

#define DFCMD_BUF2_WRITE   0x87

Buffer 2 write.

Definition at line 145 of file at45db.c.

#define DFCMD_BUF1_FLASH_NE   0x88

Buffer 1 flash without page erase.

Definition at line 148 of file at45db.c.

#define DFCMD_BUF2_FLASH_NE   0x89

Buffer 2 flash without page erase.

Definition at line 151 of file at45db.c.

#define DFCMD_CHIP_ERASE   0xC7

Chip erase.

Definition at line 154 of file at45db.c.

#define DFCMD_BUF1_READ_LF   0xD1

Buffer 1 read (low frequency).

Definition at line 157 of file at45db.c.

#define DFCMD_READ_PAGE   0xD2

Read main memory page.

Automatically wraps to the first byte of the same page after the last byte had been read. The data buffers are left unchanged.

Definition at line 163 of file at45db.c.

#define DFCMD_BUF2_READ_LF   0xD3

Buffer 2 read (low frequency).

Definition at line 166 of file at45db.c.

#define DFCMD_BUF1_READ   0xD4

Buffer 1 read.

Definition at line 169 of file at45db.c.

#define DFCMD_BUF2_READ   0xD6

Buffer 2 read.

Definition at line 172 of file at45db.c.

#define DFCMD_READ_STATUS   0xD7

Read status register.

Definition at line 175 of file at45db.c.

Referenced by At45dbGetStatus().

#define DFCMD_CONT_READ   0xE8

Continuos read (legacy).

Reads a continous stream. Automatically switches to the the page and wraps to the first page after the last has been read. Note, that the data buffers are not used for this operation.

Definition at line 182 of file at45db.c.

Referenced by At45dbPageRead().

#define AT45DB_AT91

Definition at line 185 of file at45db.c.


Function Documentation

int At45dbSendCmd ( int  dd,
u_char  op,
u_long  parm,
int  len,
CONST void *  tdata,
void *  rdata,
int  datalen 
)

Send DataFlash command.

Parameters:
dd Device descriptor.
op Command operation code.
parm Command parameter.
len Command length.
tdata Transmit data.
rdata Receive data buffer.
datalen Data length.

Definition at line 285 of file at45db.c.

References At91SpiTransfer2(), MAX_AT45_CMDLEN, and memset().

u_char At45dbGetStatus ( int  dd  ) 

Definition at line 302 of file at45db.c.

References At91SpiTransfer2(), and DFCMD_READ_STATUS.

int At45dbWaitReady ( int  dd,
u_long  tmo,
int  poll 
)

Wait until flash memory cycle finished.

Returns:
0 on success or -1 in case of an error.

Definition at line 317 of file at45db.c.

References At45dbGetStatus(), and NutSleep().

int At45dbInit ( u_int  spibas,
u_int  spipcs 
)

Initialize dataflash at specified interface and chip select.

Parameters:
spibas Interface base address. For ARM MCUs this may be the I/O base address of the hardware SPI.
spipcs Device chip select.
Returns:
Device descriptor or -1 in case of an error.

Definition at line 341 of file at45db.c.

References _BV, at45_devt, At45dbGetStatus(), At91SpiInit(), At91SpiInitChipSelects(), At91SpiReset(), At91SpiSetModeFlags(), At91SpiSetRate(), MAX_AT45_DEVICES, SPIMF_CAPRISE, SPIMF_MASTER, and SPIMF_SCKIAHI.

int At45dbPageErase ( int  dd,
u_long  pgn 
)

Erase sector at the specified offset.

Definition at line 383 of file at45db.c.

References At45dbSendCmd(), and DFCMD_PAGE_ERASE.

int At45dbChipErase ( void   ) 

Erase entire flash memory chip.

Definition at line 392 of file at45db.c.

int At45dbPageRead ( int  dd,
u_long  pgn,
void *  data,
u_int  len 
)

Read data from flash memory.

Parameters:
dd Device descriptor.
pgn Page number to read, starting at 0.
data Points to a buffer that receives the data.
len Number of bytes to read.
Returns:
0 on success or -1 in case of an error.

Definition at line 407 of file at45db.c.

References At45dbSendCmd(), and DFCMD_CONT_READ.

int At45dbPageWrite ( int  dd,
u_long  pgn,
CONST void *  data,
u_int  len 
)

Write data into flash memory.

The related sector must have been erased before calling this function.

Parameters:
dd Device descriptor.
pgn Start location within the chip, starting at 0.
data Points to a buffer that contains the bytes to be written.
len Number of bytes to write.
Returns:
0 on success or -1 in case of an error.

Definition at line 425 of file at45db.c.

References AT45_WRITE_POLLS, At45dbSendCmd(), At45dbWaitReady(), DFCMD_BUF1_FLASH, DFCMD_BUF1_WRITE, free, and malloc.

u_long At45dbPages ( int  dd  ) 

Definition at line 444 of file at45db.c.

u_int At45dbPageSize ( int  dd  ) 

Definition at line 449 of file at45db.c.

u_long At45dbParamPage ( void   ) 

Definition at line 454 of file at45db.c.

Referenced by At45dbParamRead(), and At45dbParamWrite().

int At45dbParamSize ( void   ) 

Get size of configuration area.

A part of the DataFlash may be used to store configuration parameters, like the network interface MAC address, the local hostname etc. The size of this area may be configured by defining AT45_CONF_SIZE. Otherwise one full page is used.

Returns:
The number of bytes available for configuration data. In case of an error, -1 is returned.

Definition at line 474 of file at45db.c.

References AT45_CONF_DFPCS, AT45_CONF_DFSPI, and At45dbInit().

Referenced by At45dbParamRead(), and At45dbParamWrite().

int At45dbParamRead ( u_int  pos,
void *  data,
u_int  len 
)

Load configuration parameters from flash memory.

Parameters:
pos Start location within configuration sector.
data Points to a buffer that receives the contents.
len Number of bytes to read.
Returns:
Always 0.

Definition at line 498 of file at45db.c.

References At45dbPageRead(), At45dbParamPage(), At45dbParamSize(), free, malloc, and memcpy().

int At45dbParamWrite ( u_int  pos,
CONST void *  data,
u_int  len 
)

Store configuration parameters in flash memory.

Parameters:
pos Start location within configuration sector.
data Points to a buffer that contains the bytes to store.
len Number of bytes to store.
Returns:
0 on success or -1 in case of an error.

Definition at line 524 of file at45db.c.

References At45dbPageRead(), At45dbPageWrite(), At45dbParamPage(), At45dbParamSize(), free, malloc, memcmp(), and memcpy().


Variable Documentation

AT45_DEVTAB at45_devt[]

Initial value:

 {
    {512, 264, 9, 0x3C, 0x0C},  
    {1025, 264, 9, 0x3C, 0x14}, 
    {2048, 264, 9, 0x3C, 0x1C}, 
    {4096, 264, 9, 0x3C, 0x24}, 
    {4096, 528, 10, 0x3C, 0x2C},        
    {8192, 528, 10, 0x3C, 0x34},        
    {8192, 1056, 11, 0x38, 0x38},       
    {0, 0, 0, 0, 0}             
}
Table of known Dataflash types.

Definition at line 252 of file at45db.c.

Referenced by At45dbInit().


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