mirror of
https://github.com/raphnet/gc_n64_usb-v3
synced 2024-12-21 23:08:53 -05:00
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* gc_n64_usb : Gamecube or N64 controller to USB adapter firmware
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Copyright (C) 2007-2016 Raphael Assenat <raph@raphnet.net>
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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 3 of the License, or
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(at your option) any later version.
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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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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 <avr/eeprom.h>
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#include <util/crc16.h>
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#include <stdint.h>
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#include <string.h>
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#include "eeprom.h"
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static uint16_t calc_geeprom_data_crc(void)
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{
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uint16_t crc = 0x0000;
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int i;
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/* Update the CRC */
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for (i=0; i<EEPROM_USED_SIZE_NOCRC; i++) {
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crc = _crc_xmodem_update(crc, ((uint8_t*)&g_eeprom_data)[i]);
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}
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return crc;
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}
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void eeprom_commit(void)
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{
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g_eeprom_data.crc16 = calc_geeprom_data_crc();
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/* Sync eeprom content */
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eeprom_update_block(&g_eeprom_data, EEPROM_BASE_PTR, EEPROM_USED_SIZE);
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}
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static char isCrcValid()
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{
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return g_eeprom_data.crc16 == calc_geeprom_data_crc();
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}
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// return 1 if eeprom was blank
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void eeprom_init(void)
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{
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eeprom_read_block(&g_eeprom_data, EEPROM_BASE_PTR, EEPROM_USED_SIZE);
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/* Detect new or corrupted content. Program default values if required. */
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if ((g_eeprom_data.magic != EEPROM_MAGIC) || !isCrcValid())
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{
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memset(&g_eeprom_data, 0, EEPROM_USED_SIZE);
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g_eeprom_data.magic = EEPROM_MAGIC;
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// Call application code to set application defaults
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eeprom_app_write_defaults();
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// Write the now valid content to the EEPROM at once.
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eeprom_commit();
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}
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eeprom_app_ready();
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}
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