Contiki 2.6

battery-sensor.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2010, University of Colombo School of Computing.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  */
00031 
00032 /**
00033  * \file
00034  *         Battery sensor driver.
00035  * \author
00036  *         Kasun Hewage <kasun.ch@gmail.com>
00037  */
00038 
00039 #include <avr/io.h>
00040 #include "dev/battery-sensor.h"
00041 #include "dev/adc.h"
00042 
00043 
00044 #define BAT_MONITOR_PORT PORTF
00045 #define BAT_MONITOR_PIN_MASK _BV(1)
00046 #define BAT_MONITOR_PORT_DDR DDRF
00047 #define BAT_MONITOR_ADC_CHANNEL 30
00048 
00049 const struct sensors_sensor battery_sensor;
00050 static uint8_t active;
00051 /*---------------------------------------------------------------------------*/
00052 static void
00053 activate(void)
00054 {
00055   /* This assumes that some other sensor system already did setup the ADC */
00056   adc_init();
00057 
00058   /* Enable battery sensor. */
00059   BAT_MONITOR_PORT |= BAT_MONITOR_PIN_MASK;
00060   BAT_MONITOR_PORT_DDR |= BAT_MONITOR_PIN_MASK;
00061 
00062   active = 1;
00063 }
00064 /*---------------------------------------------------------------------------*/
00065 static void
00066 deactivate(void)
00067 {
00068   active = 0;
00069 }
00070 /*---------------------------------------------------------------------------*/
00071 static int
00072 value(int type)
00073 {
00074   return get_adc(BAT_MONITOR_ADC_CHANNEL);
00075 }
00076 /*---------------------------------------------------------------------------*/
00077 static int
00078 configure(int type, int c)
00079 {
00080   switch(type) {
00081   case SENSORS_ACTIVE:
00082     if (c) {
00083       activate();
00084     } else {
00085       deactivate();
00086     }
00087   }
00088   return 0;
00089 }
00090 /*---------------------------------------------------------------------------*/
00091 static int
00092 status(int type)
00093 {
00094   switch (type) {
00095   case SENSORS_ACTIVE:
00096   case SENSORS_READY:
00097     return active;
00098   }
00099   return 0;
00100 }
00101 /*---------------------------------------------------------------------------*/
00102 SENSORS_SENSOR(battery_sensor, BATTERY_SENSOR,
00103                value, configure, status);