aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/eeprom/eeprom_driver.c
blob: 3835e5e9d0553b8458aae4879171433b29ec982e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/* Copyright 2019 Nick Brassel (tzarc)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdint.h>
#include <string.h>

#include "eeprom_driver.h"

uint8_t eeprom_read_byte(const uint8_t *addr) {
    uint8_t ret;
    eeprom_read_block(&ret, addr, 1);
    return ret;
}

uint16_t eeprom_read_word(const uint16_t *addr) {
    uint16_t ret;
    eeprom_read_block(&ret, addr, 2);
    return ret;
}

uint32_t eeprom_read_dword(const uint32_t *addr) {
    uint32_t ret;
    eeprom_read_block(&ret, addr, 4);
    return ret;
}

void eeprom_write_byte(uint8_t *addr, uint8_t value) { eeprom_write_block(&value, addr, 1); }

void eeprom_write_word(uint16_t *addr, uint16_t value) { eeprom_write_block(&value, addr, 2); }

void eeprom_write_dword(uint32_t *addr, uint32_t value) { eeprom_write_block(&value, addr, 4); }

void eeprom_update_block(const void *buf, void *addr, size_t len) {
    uint8_t read_buf[len];
    eeprom_read_block(read_buf, addr, len);
    if (memcmp(buf, read_buf, len) != 0) {
        eeprom_write_block(buf, addr, len);
    }
}

void eeprom_update_byte(uint8_t *addr, uint8_t value) {
    uint8_t orig = eeprom_read_byte(addr);
    if (orig != value) {
        eeprom_write_byte(addr, value);
    }
}

void eeprom_update_word(uint16_t *addr, uint16_t value) {
    uint16_t orig = eeprom_read_word(addr);
    if (orig != value) {
        eeprom_write_word(addr, value);
    }
}

void eeprom_update_dword(uint32_t *addr, uint32_t value) {
    uint32_t orig = eeprom_read_dword(addr);
    if (orig != value) {
        eeprom_write_dword(addr, value);
    }
}