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68 lines
1.9 KiB
68 lines
1.9 KiB
/* 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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