56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* Copyright 2019 Nick Brassel (tzarc)
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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 <stdint.h>
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#include <string.h>
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#include "eeprom_driver.h"
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#include "eeprom_transient.h"
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__attribute__((aligned(4))) static uint8_t transientBuffer[TRANSIENT_EEPROM_SIZE] = {0};
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size_t clamp_length(intptr_t offset, size_t len) {
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if (offset + len > TRANSIENT_EEPROM_SIZE) {
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len = TRANSIENT_EEPROM_SIZE - offset;
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}
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return len;
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}
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void eeprom_driver_init(void) {
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eeprom_driver_erase();
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}
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void eeprom_driver_erase(void) {
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memset(transientBuffer, 0x00, TRANSIENT_EEPROM_SIZE);
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}
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void eeprom_read_block(void *buf, const void *addr, size_t len) {
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intptr_t offset = (intptr_t)addr;
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memset(buf, 0x00, len);
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len = clamp_length(offset, len);
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if (len > 0) {
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memcpy(buf, &transientBuffer[offset], len);
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}
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}
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void eeprom_write_block(const void *buf, void *addr, size_t len) {
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intptr_t offset = (intptr_t)addr;
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len = clamp_length(offset, len);
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if (len > 0) {
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memcpy(&transientBuffer[offset], buf, len);
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}
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}
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