qmk-keychron-q3-colemak-dh/tmk_core/common/arm_atsam/eeprom.c

/* Copyright 2017 Fred Sundvik
 *
 * 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 "eeprom.h"

#define EEPROM_SIZE 32

static uint8_t buffer[EEPROM_SIZE];

uint8_t eeprom_read_byte(const uint8_t *addr) {
	uintptr_t offset = (uintptr_t)addr;
	return buffer[offset];
}

void eeprom_write_byte(uint8_t *addr, uint8_t value) {
	uintptr_t offset = (uintptr_t)addr;
	buffer[offset] = value;
}

uint16_t eeprom_read_word(const uint16_t *addr) {
	const uint8_t *p = (const uint8_t *)addr;
	return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8);
}

uint32_t eeprom_read_dword(const uint32_t *addr) {
	const uint8_t *p = (const uint8_t *)addr;
	return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8)
		| (eeprom_read_byte(p+2) << 16) | (eeprom_read_byte(p+3) << 24);
}

void eeprom_read_block(void *buf, const void *addr, uint32_t len) {
	const uint8_t *p = (const uint8_t *)addr;
	uint8_t *dest = (uint8_t *)buf;
	while (len--) {
		*dest++ = eeprom_read_byte(p++);
	}
}

void eeprom_write_word(uint16_t *addr, uint16_t value) {
	uint8_t *p = (uint8_t *)addr;
	eeprom_write_byte(p++, value);
	eeprom_write_byte(p, value >> 8);
}

void eeprom_write_dword(uint32_t *addr, uint32_t value) {
	uint8_t *p = (uint8_t *)addr;
	eeprom_write_byte(p++, value);
	eeprom_write_byte(p++, value >> 8);
	eeprom_write_byte(p++, value >> 16);
	eeprom_write_byte(p, value >> 24);
}

void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
	uint8_t *p = (uint8_t *)addr;
	const uint8_t *src = (const uint8_t *)buf;
	while (len--) {
		eeprom_write_byte(p++, *src++);
	}
}

void eeprom_update_byte(uint8_t *addr, uint8_t value) {
	eeprom_write_byte(addr, value);
}

void eeprom_update_word(uint16_t *addr, uint16_t value) {
	uint8_t *p = (uint8_t *)addr;
	eeprom_write_byte(p++, value);
	eeprom_write_byte(p, value >> 8);
}

void eeprom_update_dword(uint32_t *addr, uint32_t value) {
	uint8_t *p = (uint8_t *)addr;
	eeprom_write_byte(p++, value);
	eeprom_write_byte(p++, value >> 8);
	eeprom_write_byte(p++, value >> 16);
	eeprom_write_byte(p, value >> 24);
}

void eeprom_update_block(const void *buf, void *addr, uint32_t len) {
	uint8_t *p = (uint8_t *)addr;
	const uint8_t *src = (const uint8_t *)buf;
	while (len--) {
		eeprom_write_byte(p++, *src++);
	}
}