88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISE OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* -----------------------------------------------------------------
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*
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* Author : Dag Björklund, Robert Olsson
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* Created : 2005-11-01
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* Updated : $Date: 2010/08/25 19:30:52 $
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* $Revision: 1.11 $
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*/
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#include "contiki.h"
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#include "dev/battery-sensor.h"
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#include <util/delay_basic.h>
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#define delay_us(us) (_delay_loop_2(1 + (us * F_CPU) / 4000000UL))
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const struct sensors_sensor battery_sensor;
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/* Returns the MCU voltage in mV read from the BATMON MCU register
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* See AtMega chip docs for BATMON details.
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*/
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static int
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value(int type)
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{
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uint16_t mv;
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int i;
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/* Resolution is 75mV if V>=2.55V; and 50mV if V<=2.45V */
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mv = 3675;
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for(i = 0x1f; 1; i--) {
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BATMON = i;
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delay_us(100);
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if(BATMON & 0x20) {
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break;
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}
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if(i == 0x10) { /* Range hi or lo */
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mv = 2500;
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}
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if(i > 0x10) {
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mv -= 75;
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} else {
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mv -= 50;
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}
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}
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return (int)((float)mv);
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}
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static int
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configure(int type, int c)
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{
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return 0;
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}
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static int
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status(int type)
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{
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return 1;
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}
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SENSORS_SENSOR(battery_sensor, BATTERY_SENSOR, value, configure, status);
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