1 /* Copyright 2017 Fred Sundvik
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.
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.
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/>.
19 #define EEPROM_SIZE 32
21 static uint8_t buffer[EEPROM_SIZE];
23 uint8_t eeprom_read_byte(const uint8_t *addr) {
24 uintptr_t offset = (uintptr_t)addr;
25 return buffer[offset];
28 void eeprom_write_byte(uint8_t *addr, uint8_t value) {
29 uintptr_t offset = (uintptr_t)addr;
30 buffer[offset] = value;
33 uint16_t eeprom_read_word(const uint16_t *addr) {
34 const uint8_t *p = (const uint8_t *)addr;
35 return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8);
38 uint32_t eeprom_read_dword(const uint32_t *addr) {
39 const uint8_t *p = (const uint8_t *)addr;
40 return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8)
41 | (eeprom_read_byte(p+2) << 16) | (eeprom_read_byte(p+3) << 24);
44 void eeprom_read_block(void *buf, const void *addr, uint32_t len) {
45 const uint8_t *p = (const uint8_t *)addr;
46 uint8_t *dest = (uint8_t *)buf;
48 *dest++ = eeprom_read_byte(p++);
52 void eeprom_write_word(uint16_t *addr, uint16_t value) {
53 uint8_t *p = (uint8_t *)addr;
54 eeprom_write_byte(p++, value);
55 eeprom_write_byte(p, value >> 8);
58 void eeprom_write_dword(uint32_t *addr, uint32_t value) {
59 uint8_t *p = (uint8_t *)addr;
60 eeprom_write_byte(p++, value);
61 eeprom_write_byte(p++, value >> 8);
62 eeprom_write_byte(p++, value >> 16);
63 eeprom_write_byte(p, value >> 24);
66 void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
67 uint8_t *p = (uint8_t *)addr;
68 const uint8_t *src = (const uint8_t *)buf;
70 eeprom_write_byte(p++, *src++);
74 void eeprom_update_byte(uint8_t *addr, uint8_t value) {
75 eeprom_write_byte(addr, value);
78 void eeprom_update_word(uint16_t *addr, uint16_t value) {
79 uint8_t *p = (uint8_t *)addr;
80 eeprom_write_byte(p++, value);
81 eeprom_write_byte(p, value >> 8);
84 void eeprom_update_dword(uint32_t *addr, uint32_t value) {
85 uint8_t *p = (uint8_t *)addr;
86 eeprom_write_byte(p++, value);
87 eeprom_write_byte(p++, value >> 8);
88 eeprom_write_byte(p++, value >> 16);
89 eeprom_write_byte(p, value >> 24);
92 void eeprom_update_block(const void *buf, void *addr, uint32_t len) {
93 uint8_t *p = (uint8_t *)addr;
94 const uint8_t *src = (const uint8_t *)buf;
96 eeprom_write_byte(p++, *src++);