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Add support for the AT 24C512 EEPROM

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This commit is contained in:
Gregory Nutt 2013-09-12 09:44:38 -06:00
parent 0d02d854ed
commit b3018d8bf0
3 changed files with 24 additions and 10 deletions
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3
ChangeLog
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@ -5534,4 +5534,7 @@
definition file (2013-9-11).
* arch/arm/src/sama5/sam_twi.c and .h: Framework for a SAMA5
TWI driver (not much present in initial checkin) (2013-9-11).
* fs/nxffs: Clean up some compilation warnings (2013-9-12)
* drivers/mtd/at24xx.c: Add support for the AT 24C512 part
(2013-9-12).

14
drivers/mtd/Kconfig
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@ -67,22 +67,28 @@ config RAMMTD_FLASHSIM
endif
config MTD_AT24XX
bool "I2C-based AT24XX eeprom"
bool "I2C-based AT24xx eeprom"
default n
select I2C
---help---
Build support for I2C-based at24cxx EEPROM(at24c32, at24c64,
Build support for I2C-based AT24CXX EEPROM(at24c32, at24c64,
at24c128, at24c256)
if MTD_AT24XX
config AT24XX_SIZE
int "at24xx size(kByte)"
int "AT24xx size (kbit)"
default 64
---help---
This is the XX in the AT24Cxx part number. For example, if you have a
AT 24C512, then the correct value is 512. This value is also the capacity
of the part in kilobits. For example, the 24C512 supports 512 Kbits or
512 /8 = 64 KiB.
config AT24XX_ADDR
hex "at24xx i2c address"
hex "AT24XX I2C address"
default 0x50
range 0x50 0x57
endif

17
drivers/mtd/at24xx.c
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@ -1,6 +1,6 @@
/************************************************************************************
* drivers/mtd/at24xx.c
* Driver for I2C-based at24cxx EEPROM(at24c32,at24c64,at24c128,at24c256)
* Driver for I2C-based at24cxx EEPROM(at24c32,at24c64,at24c128,at24c256,at24c512)
*
* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
* Author: Li Zhuoyi <lzyy.cn@gmail.com>
@ -81,21 +81,24 @@
/* Get the part configuration based on the size configuration */
#if CONFIG_AT24XX_SIZE == 32
#if CONFIG_AT24XX_SIZE == 32 /* AT24C32: 32Kbits = 4KiB; 128 * 32 = 4096 */
# define AT24XX_NPAGES 128
# define AT24XX_PAGESIZE 32
#elif CONFIG_AT24XX_SIZE == 48
#elif CONFIG_AT24XX_SIZE == 48 /* AT24C48: 48Kbits = 6KiB; 192 * 32 = 6144 */
# define AT24XX_NPAGES 192
# define AT24XX_PAGESIZE 32
#elif CONFIG_AT24XX_SIZE == 64
#elif CONFIG_AT24XX_SIZE == 64 /* AT24C64: 64Kbits = 8KiB; 256 * 32 = 8192 */
# define AT24XX_NPAGES 256
# define AT24XX_PAGESIZE 32
#elif CONFIG_AT24XX_SIZE == 128
#elif CONFIG_AT24XX_SIZE == 128 /* AT24C128: 128Kbits = 16KiB; 256 * 64 = 16384 */
# define AT24XX_NPAGES 256
# define AT24XX_PAGESIZE 64
#elif CONFIG_AT24XX_SIZE == 256
#elif CONFIG_AT24XX_SIZE == 256 /* AT24C256: 256Kbits = 32KiB; 512 * 64 = 32768 */
# define AT24XX_NPAGES 512
# define AT24XX_PAGESIZE 64
#elif CONFIG_AT24XX_SIZE == 512 /* AT24C512: 512Kbits = 64KiB; 512 * 128 = 65536 */
# define AT24XX_NPAGES 512
# define AT24XX_PAGESIZE 128
#endif
/* For applications where a file system is used on the AT24, the tiny page sizes
@ -139,8 +142,10 @@ static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
size_t nblocks, FAR uint8_t *buf);
static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
size_t nblocks, FAR const uint8_t *buf);
#if 0 /* Not implemented */
static ssize_t at24c_read(FAR struct mtd_dev_s *dev, off_t offset,
size_t nbytes,FAR uint8_t *buffer);
#endif
static int at24c_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
/************************************************************************************