58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/***************************************************************************
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* Copyright (C) 02/2008 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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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; version 2 of the License, *
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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, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/pgmspace.h>
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#include <avr/eeprom.h>
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#include <util/crc16.h>
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#include "eeprom.h"
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static struct ee_param defaults PROGMEM = DEFAULT_PARAMETERS;
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struct ee_param params;
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struct ee_param params_in_eeprom EEMEM = DEFAULT_PARAMETERS;
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void write_parameters(void)
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{
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uint8_t i;
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uint16_t crc = 0x0000;
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uint8_t *tmp = (uint8_t *)¶ms;
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for (i = 0; i < sizeof(struct ee_param) -2; i++)
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crc = _crc_ccitt_update(crc, *tmp++);
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params.crc16 = crc;
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eeprom_write_block(¶ms, ¶ms_in_eeprom, sizeof(struct ee_param));
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}
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uint8_t read_parameters(void)
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{
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eeprom_read_block(¶ms, ¶ms_in_eeprom, sizeof(struct ee_param));
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uint8_t i;
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uint16_t crc = 0x0000;
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uint8_t *tmp = (uint8_t *)¶ms;
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for (i = 0; i < sizeof(struct ee_param); i++)
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crc = _crc_ccitt_update(crc, *tmp++);
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if (crc != 0x0000) {
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memcpy_P(¶ms, &defaults, sizeof(struct ee_param));
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write_parameters();
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return 1;
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}
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return 0;
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}
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