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