sergiotarxz/nuttx
sergiotarxz/nuttx
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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2942 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-09-12 13:28:21 +00:00
parent 3d9e1c72e8
commit 2c19b94f1e
1 changed files with 26 additions and 20 deletions
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42
drivers/mtd/at45db.c
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@ -156,6 +156,7 @@
#define AT45DB_DEVID1_8MBIT 0x05 /* xxx0 0101 = 8Mbit AT45DB081 */
#define AT45DB_DEVID1_16MBIT 0x06 /* xxx0 0110 = 16Mbit AT45DB161 */
#define AT45DB_DEVID1_32MBIT 0x07 /* xxx0 0111 = 32Mbit AT45DB321 */
#define AT45DB_DEVID1_64MBIT 0x08 /* xxx0 1000 = 32Mbit AT45DB641 */
#define AT45DB_DEVID1_FAMMSK 0xe0 /* Bits 5-7: Family */
#define AT45DB_DEVID1_DFLASH 0x20 /* 001x xxxx = Dataflash */
#define AT45DB_DEVID1_AT26DF 0x40 /* 010x xxxx = AT26DFxxx series (Not supported) */
@ -229,10 +230,10 @@ static int at45db_ioctl(FAR struct mtd_dev_s *mtd, int cmd, unsigned long arg);
#define CHIP_ERASE_SIZE 4
static const uint8_t g_chiperase[CHIP_ERASE_SIZE] = {0xc7, 0x94, 0x80, 0x9a};
/* Sequence to program the device to 512 page size */
/* Sequence to program the device to binary page sizes{256, 512, 1024} */
#define CFG512_SIZE 4
static const uint8_t g_cfg512[CFG512_SIZE] = {0x3d, 0x2a, 0x80, 0xa6};
#define BINPGSIZE_SIZE 4
static const uint8_t g_binpgsize[BINPGSIZE_SIZE] = {0x3d, 0x2a, 0x80, 0xa6};
/************************************************************************************
* Private Functions
@ -353,35 +354,42 @@ static inline int at45db_rdid(struct at45db_dev_s *priv)
case AT45DB_DEVID1_2MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB021 */
priv->pageshift = 8; /* Page size = 256 bytes */
priv->pageshift = 8; /* Page size = 256/264 bytes */
priv->npages = 1024; /* 1024 pages */
return OK;
case AT45DB_DEVID1_4MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB041 */
priv->pageshift = 8; /* Page size = 256 bytes */
priv->pageshift = 8; /* Page size = 256/264 bytes */
priv->npages = 2048; /* 2048 pages */
return OK;
case AT45DB_DEVID1_8MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB081 */
priv->pageshift = 8; /* Page size = 256 bytes */
priv->pageshift = 8; /* Page size = 256/264 bytes */
priv->npages = 4096; /* 4096 pages */
return OK;
case AT45DB_DEVID1_16MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB161 */
priv->pageshift = 9; /* Page size = 512 bytes */
priv->pageshift = 9; /* Page size = 512/528 bytes */
priv->npages = 4096; /* 4096 pages */
return OK;
case AT45DB_DEVID1_32MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB321 */
priv->pageshift = 9; /* Page size = 512 bytes */
priv->pageshift = 9; /* Page size = 512/528 bytes */
priv->npages = 8192; /* 8192 pages */
return OK;
case AT45DB_DEVID1_64MBIT:
/* Save the FLASH geometry for the 16Mbit AT45DB321 */
priv->pageshift = 10; /* Page size = 1024/1056 bytes */
priv->npages = 8192; /* 8192 pages */
return OK;
@ -438,15 +446,13 @@ static inline void at45db_pgerase(struct at45db_dev_s *priv, off_t sector)
fvdbg("sector: %08lx\n", (long)sector);
/* The Page Erase command can be used to individually erase any page in the main
/* "The Page Erase command can be used to individually erase any page in the main
* memory array allowing the Buffer to Main Memory Page Program to be utilized at a
* later time. ... To perform a page erase in the binary page size (512 bytes), the
* later time. ... To perform a page erase in the binary page size ..., the
* opcode 81H must be loaded into the device, followed by three address bytes
* consist of 3 don’t care bits, 12 page address bits (A20 - A9) that specify the
* page in the main memory to be erased and 9 don’t care bits. When a low-to-high
* transition occurs on the CS pin, the part will erase the selected page (the
* erased state is a logical 1). ... the status register and the RDY/BUSY pin will
* indicate that the part is busy.
* ... When a low-to-high transition occurs on the CS pin, the part will erase the
* selected page (the erased state is a logical 1). ... the status register and the
* RDY/BUSY pin will indicate that the part is busy."
*/
erasecmd[0] = AT45DB_PGERASE; /* Page erase command */
@ -777,17 +783,17 @@ FAR struct mtd_dev_s *at45db_initialize(FAR struct spi_dev_s *spi)
sr = at45db_waitbusy(priv);
/* Check if the device is configured as 512 page device */
/* Check if the device is configured as 256, 512 or 1024 bytes-per-page device */
if ((sr & AT45DB_SR_PGSIZE) == 0)
{
/* No, re-program it for 512 byte pages. NOTE: A power cycle
/* No, re-program it for the binary page size. NOTE: A power cycle
* is required after the device has be re-programmed.
*/
fdbg("Reprogramming page size\n");
SPI_SELECT(priv->spi, SPIDEV_FLASH, true);
SPI_SNDBLOCK(priv->spi, g_cfg512, CFG512_SIZE);
SPI_SNDBLOCK(priv->spi, g_binpgsize, BINPGSIZE_SIZE);
SPI_SELECT(priv->spi, SPIDEV_FLASH, false);
goto errout;
}