99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
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/* Copyright 2017 Fred Sundvik
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "eeprom.h"
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#define EEPROM_SIZE 32
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static uint8_t buffer[EEPROM_SIZE];
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uint8_t eeprom_read_byte(const uint8_t *addr) {
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uintptr_t offset = (uintptr_t)addr;
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return buffer[offset];
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}
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void eeprom_write_byte(uint8_t *addr, uint8_t value) {
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uintptr_t offset = (uintptr_t)addr;
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buffer[offset] = value;
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}
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uint16_t eeprom_read_word(const uint16_t *addr) {
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const uint8_t *p = (const uint8_t *)addr;
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return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8);
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}
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uint32_t eeprom_read_dword(const uint32_t *addr) {
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const uint8_t *p = (const uint8_t *)addr;
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return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8)
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| (eeprom_read_byte(p+2) << 16) | (eeprom_read_byte(p+3) << 24);
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}
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void eeprom_read_block(void *buf, const void *addr, uint32_t len) {
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const uint8_t *p = (const uint8_t *)addr;
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uint8_t *dest = (uint8_t *)buf;
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while (len--) {
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*dest++ = eeprom_read_byte(p++);
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}
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}
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void eeprom_write_word(uint16_t *addr, uint16_t value) {
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uint8_t *p = (uint8_t *)addr;
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eeprom_write_byte(p++, value);
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eeprom_write_byte(p, value >> 8);
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}
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void eeprom_write_dword(uint32_t *addr, uint32_t value) {
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uint8_t *p = (uint8_t *)addr;
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eeprom_write_byte(p++, value);
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eeprom_write_byte(p++, value >> 8);
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eeprom_write_byte(p++, value >> 16);
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eeprom_write_byte(p, value >> 24);
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}
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void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
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uint8_t *p = (uint8_t *)addr;
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const uint8_t *src = (const uint8_t *)buf;
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while (len--) {
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eeprom_write_byte(p++, *src++);
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}
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}
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void eeprom_update_byte(uint8_t *addr, uint8_t value) {
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eeprom_write_byte(addr, value);
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}
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void eeprom_update_word(uint16_t *addr, uint16_t value) {
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uint8_t *p = (uint8_t *)addr;
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eeprom_write_byte(p++, value);
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eeprom_write_byte(p, value >> 8);
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}
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void eeprom_update_dword(uint32_t *addr, uint32_t value) {
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uint8_t *p = (uint8_t *)addr;
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eeprom_write_byte(p++, value);
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eeprom_write_byte(p++, value >> 8);
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eeprom_write_byte(p++, value >> 16);
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eeprom_write_byte(p, value >> 24);
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}
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void eeprom_update_block(const void *buf, void *addr, uint32_t len) {
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uint8_t *p = (uint8_t *)addr;
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const uint8_t *src = (const uint8_t *)buf;
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while (len--) {
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eeprom_write_byte(p++, *src++);
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}
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}
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