nes-proj/platform/jn516x/dev/dr1175/light-sensor.c

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2015-09-21 08:57:54 +00:00
/*
* Copyright (c) 2015 NXP B.V.
* 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 NXP B.V. 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 NXP B.V. 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 NXP B.V. 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.
*
* Author: Theo van Daele <theo.van.daele@nxp.com>
*
*/
#include "contiki.h"
#include "sys/etimer.h"
#include "lib/sensors.h"
#include "light-sensor.h"
#include <AppHardwareApi.h>
#include <AlsDriver.h>
#include <stdlib.h>
/*---------------------------------------------------------------------------*/
/* LOCAL DEFINITIONS */
/*---------------------------------------------------------------------------*/
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
typedef enum {
LIGHT_SENSOR_STATUS_NOT_INIT = 0,
LIGHT_SENSOR_STATUS_INIT,
LIGHT_SENSOR_STATUS_NOT_ACTIVE = LIGHT_SENSOR_STATUS_INIT,
LIGHT_SENSOR_STATUS_ACTIVE
} light_sensor_status_t;
/* Absolute delta in light level needed to generate event */
#define DELTA_LIGHT_SENSOR_VALUE 1
/*---------------------------------------------------------------------------*/
/* LOCAL DATA DEFINITIONS */
/*---------------------------------------------------------------------------*/
const struct sensors_sensor light_sensor;
volatile static light_sensor_status_t light_sensor_status = LIGHT_SENSOR_STATUS_NOT_INIT;
static int prev_light_event_val = 0;
static int light_sensor_value = 0;
/*---------------------------------------------------------------------------*/
/* LOCAL FUNCTION PROTOTYPES */
/*---------------------------------------------------------------------------*/
static int adjust(int input1, int input2);
PROCESS(LightSensorSampling, "Light sensor");
/*---------------------------------------------------------------------------*/
/* PUBLIC FUNCTIONS */
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type == SENSORS_HW_INIT) {
PRINTF("SENSORS_HW_INIT\n");
light_sensor_status = LIGHT_SENSOR_STATUS_INIT;
process_start(&LightSensorSampling, NULL);
return 1;
} else if(type == SENSORS_ACTIVE) {
if(light_sensor_status != LIGHT_SENSOR_STATUS_NOT_INIT) {
if(value) {
/* ACTIVATE SENSOR */
vALSreset();
prev_light_event_val = 0;
/* Activate light sensor. Use channel 0. (Channel 1 = IR). Start sampling */
PRINTF("LIGHT SENSOR ACTIVATED\n");
light_sensor_status = LIGHT_SENSOR_STATUS_ACTIVE;
process_post(&LightSensorSampling, PROCESS_EVENT_MSG, (void *)&light_sensor_status);
} else {
/* DE-ACTIVATE SENSOR */
vALSpowerDown();
PRINTF("LIGHT SENSOR DE-ACTIVATED\n");
light_sensor_status = LIGHT_SENSOR_STATUS_NOT_ACTIVE;
process_post(&LightSensorSampling, PROCESS_EVENT_MSG, (void *)&light_sensor_status);
}
return 1;
} else {
/* Light sensor must be intialised before being (de)-activated */
PRINTF("ERROR: NO HW_INIT LIGHT SENSOR\n");
return 0;
}
} else {
/* Non valid type */
return 0;
}
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
if(type == SENSORS_ACTIVE) {
return light_sensor_status == LIGHT_SENSOR_STATUS_ACTIVE;
} else if(type == SENSORS_READY) {
return light_sensor_status != LIGHT_SENSOR_STATUS_NOT_INIT;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
/* type: Not defined for the light sensor interface */
return light_sensor_value;
}
/*---------------------------------------------------------------------------*/
/* LOCAL FUNCTIONS */
/*---------------------------------------------------------------------------*/
/* Process to get light sensor value.
Light sensor is sampled. Sampling stopped when sensor is de-activated.
Event is generated if light value changed at least the value DELTA_LIGHT_SENSOR_VALUE
since last event. */
PROCESS_THREAD(LightSensorSampling, ev, data)
{
PROCESS_BEGIN();
static struct etimer et;
int channel0_value, channel1_value;
etimer_set(&et, CLOCK_SECOND / 10);
while(1) {
PROCESS_WAIT_EVENT_UNTIL((ev == PROCESS_EVENT_TIMER) || (ev == PROCESS_EVENT_MSG));
if(ev == PROCESS_EVENT_TIMER) {
/* Handle sensor reading. */
PRINTF("Light sensor sample\n");
vALSstartReadChannel(0);
channel0_value = u16ALSreadChannelResult();
PRINTF("Channel 0 = %d\n", channel0_value);
vALSstartReadChannel(1);
channel1_value = u16ALSreadChannelResult();
PRINTF("Channel 1 = %d\n", channel1_value);
light_sensor_value = adjust(channel0_value, channel1_value);
PRINTF("Light output = %d\n", light_sensor_value);
if(abs(light_sensor_value - prev_light_event_val) > DELTA_LIGHT_SENSOR_VALUE) {
prev_light_event_val = light_sensor_value;
sensors_changed(&light_sensor);
}
etimer_reset(&et);
} else {
/* ev == PROCESS_EVENT_MSG */
if(*(int *)data == LIGHT_SENSOR_STATUS_NOT_ACTIVE) {
/* Stop sampling */
etimer_stop(&et);
} else if((*(int *)data == LIGHT_SENSOR_STATUS_ACTIVE)) {
/* restart sampling */
etimer_restart(&et);
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/* Sensor defintion for sensor module */
SENSORS_SENSOR(light_sensor, LIGHT_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* adjust() converts the 2 measured light level into 1 ambient light level. */
/* See manual JN-RM-2003.pdf */
/* Approximation is used: output[Lux] = 0.39*(ch0-ch1) */
/*---------------------------------------------------------------------------*/
static int
adjust(int ch0, int ch1)
{
if(ch0 > ch1) {
return (39 * (ch0 - ch1)) / 100;
} else {
return 0;
}
}