osd-contiki/platform/esb/dev/sound-sensor.c

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/*
* Copyright (c) 2005, 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.
*
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* @(#)$Id: sound-sensor.c,v 1.4 2010/01/14 17:39:35 nifi Exp $
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*/
#include <stdlib.h>
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#include "dev/sound-sensor.h"
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#include "dev/irq.h"
#define MIC_MIN_SENS 150
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#define SAMPLE 1
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const struct sensors_sensor sound_sensor;
static unsigned int sound, micdiff, micmax, avgmax;
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static int8_t mode;
static int8_t sample_div;
static int8_t ctr;
static int16_t *sample_buffer;
static int buffer_size;
static int buf_pos;
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/*---------------------------------------------------------------------------*/
static int
irq(void)
{
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micdiff = micdiff + abs(ADC12MEM4 - sound) - (micdiff >> 3);
sound = ADC12MEM4;
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if(mode == SAMPLE) {
ctr++;
if(ctr >= sample_div) {
ctr = 0;
sample_buffer[buf_pos++] = sound;
if(buf_pos >= buffer_size) {
mode = 0;
sensors_changed(&sound_sensor);
return 1;
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}
}
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}
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/* if (micdiff > MIC_MIN_SENS) { */
/* sensors_changed(&sound_sensor); */
/* } */
/* if (micdiff > (avgmax >> 2)) { */
/* if (micdiff % 10 == 0) beep_beep(10); */
/* // Subtract a little... */
/* micdiff = micdiff - (micdiff >> 4); */
/* } */
/* if (micmax < micdiff) { */
/* micmax = micdiff; */
/* } */
/* if (micdiff > 2000) { */
/* leds_on(LEDS_GREEN); */
/* } */
/* if (micdiff > 3000) { */
/* leds_on(LEDS_YELLOW); */
/* } */
/* if (micdiff > 4000) { */
/* leds_on(LEDS_RED); */
/* } */
return 0;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
/* try returning the max to see what values we get... */
/* int mictmp = micmax; */
/* avgmax = avgmax + micmax - (avgmax >> 3); */
/* micmax = micdiff; */
/* return mictmp; */
return micdiff;
}
/*---------------------------------------------------------------------------*/
static int
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configure(int type, int value)
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{
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switch (type) {
case SENSORS_HW_INIT:
/* Initialization of ADC12 done by irq */
mode = 0;
buffer_size = 0;
return 1;
case SENSORS_ACTIVE:
if (value) {
if(!irq_adc12_active(4)) {
sound = micdiff = micmax = 0;
mode = 0;
ctr = 0;
sample_div = 0;
buf_pos = 0;
avgmax = 5000;
irq_adc12_activate(4, (INCH_0 + SREF_0), irq);
}
} else {
irq_adc12_deactivate(4);
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}
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return 1;
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}
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return 0;
}
/*---------------------------------------------------------------------------*/
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static int
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status(int type)
{
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switch (type) {
case SENSORS_ACTIVE:
return irq_adc12_active(4);
case SENSORS_READY:
return (mode != SAMPLE) && irq_adc12_active(4);
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}
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return 0;
}
/*---------------------------------------------------------------------------*/
void
sound_sensor_start_sample(void)
{
if(buffer_size > 0) {
buf_pos = 0;
ctr = 0;
mode = SAMPLE;
}
}
/*---------------------------------------------------------------------------*/
void
sound_sensor_set_buffer(int16_t *buffer, int buf_size, int divider)
{
sample_buffer = buffer;
buffer_size = buf_size;
sample_div = divider;
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}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(sound_sensor, SOUND_SENSOR,
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value, configure, status);