4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
30 * All Rights Reserved.
33 * \brief Driver for the 24xx16 and 24xx256 I2C EEPROMS.
37 * \author Stefano Fedrigo <aleph@develer.com>
38 * \author Bernie Innocenti <bernie@codewiz.org>
40 * $WIZ$ module_name = "eeprom"
41 * $WIZ$ module_depends = "kfile", "i2c"
47 #include <cfg/compiler.h>
49 #include <kern/kfile.h>
53 * Values for Eeprom types.
55 typedef enum EepromType
64 * On the same I2C bus can live more than one EEPROM
65 * device. Each device can be addressed by one or more
68 typedef uint8_t e2dev_addr_t;
71 * Describe an EEPROM context, used by the driver to
72 * access the single device.
76 KFile fd; ///< File descriptor.
77 EepromType type; ///< EEPROM type
78 e2dev_addr_t addr; ///< Device address.
84 #define KFT_EEPROM MAKE_ID('E', 'E', 'P', 'R')
87 * Convert + ASSERT from generic KFile to Eeprom.
89 INLINE Eeprom * EEPROM_CAST(KFile *fd)
91 ASSERT(fd->_type == KFT_EEPROM);
95 /// Type for EEPROM addresses
96 typedef uint16_t e2addr_t;
99 * Macro for E2Layout offset calculation
101 * \note We can't just use offsetof() here because we could use
102 * non-constant expressions to access array elements.
104 * \note 'type' is the structure type holding eeprom layout
105 * and must be defined in user files.
107 #define e2addr(type, field) ((e2addr_t)&(((type *)0)->field))
110 * Type for EEPROM block size.
112 typedef uint16_t e2blk_size_t;
115 * Type for accessing EEPROM whole size.
117 typedef uint32_t e2_size_t;
120 * Descrive all EEPROM informations
121 * needed by the driver.
123 typedef struct EepromInfo
125 bool has_dev_addr; ///< true if memory is device addressable (its A0, A1, A2 pin are used by memory).
126 e2blk_size_t blk_size; ///< block size
127 e2_size_t e2_size; ///< eeprom size
130 bool eeprom_erase(Eeprom *fd, e2addr_t addr, e2_size_t count);
131 bool eeprom_verify(Eeprom *fd, const void *buf, size_t count);
132 void eeprom_init(Eeprom *fd, EepromType, e2dev_addr_t, bool verify);
134 #endif /* DRV_EEPROM_H */