osd-contiki/platform/sky/dev/light-sensor.c
2010-01-14 20:23:02 +00:00

115 lines
3.5 KiB
C

/*
* Copyright (c) 2005-2010, 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 ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: light-sensor.c,v 1.3 2010/01/14 20:23:02 adamdunkels Exp $
*/
#include <stdlib.h>
#include <io.h>
#include "contiki.h"
#include "lib/sensors.h"
#include "dev/light-sensor.h"
const struct sensors_sensor light_sensor;
/*
* Initialize periodic readings from the 2 photo diodes. The most
* recent readings will be stored in ADC internal registers/memory.
*/
static void
light_sensor_init(void)
{
P6SEL |= 0x30;
P6DIR = 0xff;
P6OUT = 0x00;
/* Set up the ADC. */
ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC; // Setup ADC12, ref., sampling time
ADC12CTL1 = SHP + CONSEQ_3 + CSTARTADD_0; // Use sampling timer, repeat-sequenc-of-channels
ADC12MCTL0 = (INCH_4 + SREF_0); // photodiode 1 (P64)
ADC12MCTL1 = (INCH_5 + SREF_0); // photodiode 2 (P65)
ADC12CTL0 |= ADC12ON + REFON;
ADC12CTL0 |= ENC; // enable conversion
ADC12CTL0 |= ADC12SC; // sample & convert
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
switch(type) {
/* Photosynthetically Active Radiation. */
case LIGHT_SENSOR_PHOTOSYNTHETIC:
return ADC12MEM0;
/* Total Solar Radiation. */
case LIGHT_SENSOR_TOTAL_SOLAR:
return ADC12MEM1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return (ADC12CTL0 & (ADC12ON + REFON)) == (ADC12ON + REFON);
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int c)
{
switch(type) {
case SENSORS_ACTIVE:
if(c) {
if(!status(SENSORS_ACTIVE)) {
light_sensor_init();
}
} else {
/* shut down sensing */
ADC12CTL0 = 0;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(light_sensor, "Light",
value, configure, status);