From 210dbaa23cdacf3a6f2d6e23493e96ee2ac9bca7 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Thu, 4 Jun 2009 10:41:34 -0700 Subject: Use autotools, move altos to src subdir Signed-off-by: Keith Packard --- src/ao_convert.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/ao_convert.c (limited to 'src/ao_convert.c') diff --git a/src/ao_convert.c b/src/ao_convert.c new file mode 100644 index 00000000..57ed7370 --- /dev/null +++ b/src/ao_convert.c @@ -0,0 +1,55 @@ +/* + * Copyright © 2009 Keith Packard + * + * 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]; +} + +int16_t +ao_altitude_to_pres(int16_t alt) __reentrant +{ + int16_t pres; + + for (pres = 0; pres < 2047; pres++) + if (altitude_table[pres] <= alt) + break; + return pres << 4; +} + +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; +} -- cgit v1.2.3