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