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/* eeprom.c */
/* asserv - Position & speed motor control on a ATmega128. {{{
 *
 * Copyright (C) 2005 Nicolas Schodet
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Contact :
 *        Web: http://perso.efrei.fr/~schodet/
 *      Email: <contact@ni.fr.eu.org>
 * }}} */
#include <avr/eeprom.h>

#define EEPROM_KEY 0xa9

/* +AutoDec */
/* -AutoDec */

/* Read parameters from eeprom. */
static void
eeprom_read_params (void)
{
    uint8_t *p8 = 0;
    uint16_t *p16;
    if (eeprom_read_byte (p8++) != EEPROM_KEY)
	return;
    speed_acc_cpt = speed_acc = eeprom_read_byte (p8++);
    speed_max_l = eeprom_read_byte (p8++);
    speed_max_a = eeprom_read_byte (p8++);
    speed_ds = eeprom_read_byte (p8++);
    pwm_dir = eeprom_read_byte (p8++);
    p16 = (uint16_t *) p8;
    speed_left_kp = eeprom_read_word (p16++);
    speed_right_kp = eeprom_read_word (p16++);
    speed_left_ki = eeprom_read_word (p16++);
    speed_right_ki = eeprom_read_word (p16++);
    speed_left_kd = eeprom_read_word (p16++);
    speed_right_kd = eeprom_read_word (p16++);
    speed_e_sat = eeprom_read_word (p16++);
    speed_int_sat = eeprom_read_word (p16++);
    postrack_set_footing (eeprom_read_word (p16++));
}

/* Write parameters to eeprom. */
static void
eeprom_write_params (void)
{
    uint8_t *p8 = 0;
    uint16_t *p16;
    eeprom_write_byte (p8++, EEPROM_KEY);
    eeprom_write_byte (p8++, speed_acc);
    eeprom_write_byte (p8++, speed_max_l);
    eeprom_write_byte (p8++, speed_max_a);
    eeprom_write_byte (p8++, speed_ds);
    eeprom_write_byte (p8++, pwm_dir);
    p16 = (uint16_t *) p8;
    eeprom_write_word (p16++, speed_left_kp);
    eeprom_write_word (p16++, speed_right_kp);
    eeprom_write_word (p16++, speed_left_ki);
    eeprom_write_word (p16++, speed_right_ki);
    eeprom_write_word (p16++, speed_left_kd);
    eeprom_write_word (p16++, speed_right_kd);
    eeprom_write_word (p16++, speed_e_sat);
    eeprom_write_word (p16++, speed_int_sat);
    eeprom_write_word (p16++, postrack_footing);
}

/* Clear eeprom parameters. */
static void
eeprom_clear_params (void)
{
    uint8_t *p = 0;
    eeprom_write_byte (p, 0xff);
}