eeprom_driver.c

 1/* Copyright 2019 Nick Brassel (tzarc)
 2 *
 3 * This program is free software: you can redistribute it and/or modify
 4 * it under the terms of the GNU General Public License as published by
 5 * the Free Software Foundation, either version 2 of the License, or
 6 * (at your option) any later version.
 7 *
 8 * This program is distributed in the hope that it will be useful,
 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <stdint.h>
18#include <string.h>
19
20#include "eeprom_driver.h"
21
22uint8_t eeprom_read_byte(const uint8_t *addr) {
23    uint8_t ret = 0;
24    eeprom_read_block(&ret, addr, 1);
25    return ret;
26}
27
28uint16_t eeprom_read_word(const uint16_t *addr) {
29    uint16_t ret = 0;
30    eeprom_read_block(&ret, addr, 2);
31    return ret;
32}
33
34uint32_t eeprom_read_dword(const uint32_t *addr) {
35    uint32_t ret = 0;
36    eeprom_read_block(&ret, addr, 4);
37    return ret;
38}
39
40void eeprom_write_byte(uint8_t *addr, uint8_t value) {
41    eeprom_write_block(&value, addr, 1);
42}
43
44void eeprom_write_word(uint16_t *addr, uint16_t value) {
45    eeprom_write_block(&value, addr, 2);
46}
47
48void eeprom_write_dword(uint32_t *addr, uint32_t value) {
49    eeprom_write_block(&value, addr, 4);
50}
51
52void eeprom_update_block(const void *buf, void *addr, size_t len) {
53    uint8_t read_buf[len];
54    eeprom_read_block(read_buf, addr, len);
55    if (memcmp(buf, read_buf, len) != 0) {
56        eeprom_write_block(buf, addr, len);
57    }
58}
59
60void eeprom_update_byte(uint8_t *addr, uint8_t value) {
61    uint8_t orig = eeprom_read_byte(addr);
62    if (orig != value) {
63        eeprom_write_byte(addr, value);
64    }
65}
66
67void eeprom_update_word(uint16_t *addr, uint16_t value) {
68    uint16_t orig = eeprom_read_word(addr);
69    if (orig != value) {
70        eeprom_write_word(addr, value);
71    }
72}
73
74void eeprom_update_dword(uint32_t *addr, uint32_t value) {
75    uint32_t orig = eeprom_read_dword(addr);
76    if (orig != value) {
77        eeprom_write_dword(addr, value);
78    }
79}
80
81void eeprom_driver_format(bool erase) __attribute__((weak));
82void eeprom_driver_format(bool erase) {
83    (void)erase; /* The default implementation assumes that the eeprom must be erased in order to be usable. */
84    eeprom_driver_erase();
85}