- /* 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"
- #include "eeprom_transient.h"
-
- __attribute__((aligned(4))) static uint8_t transientBuffer[TRANSIENT_EEPROM_SIZE] = {0};
-
- size_t clamp_length(intptr_t offset, size_t len) {
- if (offset + len > TRANSIENT_EEPROM_SIZE) {
- len = TRANSIENT_EEPROM_SIZE - offset;
- }
-
- return len;
- }
-
- void eeprom_driver_init(void) {
- eeprom_driver_erase();
- }
-
- void eeprom_driver_erase(void) {
- memset(transientBuffer, 0x00, TRANSIENT_EEPROM_SIZE);
- }
-
- void eeprom_read_block(void *buf, const void *addr, size_t len) {
- intptr_t offset = (intptr_t)addr;
- memset(buf, 0x00, len);
- len = clamp_length(offset, len);
- if (len > 0) {
- memcpy(buf, &transientBuffer[offset], len);
- }
- }
-
- void eeprom_write_block(const void *buf, void *addr, size_t len) {
- intptr_t offset = (intptr_t)addr;
- len = clamp_length(offset, len);
- if (len > 0) {
- memcpy(&transientBuffer[offset], buf, len);
- }
- }
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