/*
 * Copyright © 2009 Keith Packard <keithp@keithp.com>
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include "ao.h"

static const int16_t altitude_table[2048] = {
#include "altitude.h"
};

int16_t
ao_pres_to_altitude(int16_t pres) __reentrant
{
	pres = pres >> 4;
	if (pres < 0) pres = 0;
	if (pres > 2047) pres = 2047;
	return altitude_table[pres];
}

static __xdata uint8_t	ao_temp_mutex;

int16_t
ao_temp_to_dC(int16_t temp) __reentrant
{
	int16_t	ret;

	ao_mutex_get(&ao_temp_mutex);
	ret = (int16_t) ((temp >> 4) * 3300L / 2047L) - 500;
	ao_mutex_put(&ao_temp_mutex);
	return ret;
}

int16_t
ao_accel_to_cm_per_s2(int16_t accel) __reentrant;