sound-sensor.c

00001 /*
00002  * Copyright (c) 2005, Swedish Institute of Computer Science
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  * @(#)$Id: sound-sensor.c,v 1.5 2010/02/08 00:00:45 nifi Exp $
00032  */
00033 #include "dev/sound-sensor.h"
00034 #include "dev/irq.h"
00035 #include <stdlib.h>
00036 #include <io.h>
00037 
00038 #define MIC_MIN_SENS 150
00039 #define SAMPLE 1
00040 
00041 const struct sensors_sensor sound_sensor;
00042 
00043 static unsigned int sound, micdiff, micmax, avgmax;
00044 static int8_t mode;
00045 static int8_t sample_div;
00046 static int8_t ctr;
00047 static int16_t *sample_buffer;
00048 static int buffer_size;
00049 static int buf_pos;
00050 
00051 /*---------------------------------------------------------------------------*/
00052 static int
00053 irq(void)
00054 {
00055   micdiff = micdiff + abs(ADC12MEM4 - sound) - (micdiff >> 3);
00056   sound = ADC12MEM4;
00057 
00058   if(mode == SAMPLE) {
00059     ctr++;
00060     if(ctr >= sample_div) {
00061       ctr = 0;
00062       sample_buffer[buf_pos++] = sound;
00063       if(buf_pos >= buffer_size) {
00064         mode = 0;
00065         sensors_changed(&sound_sensor);
00066         return 1;
00067       }
00068     }
00069   }
00070 
00071 /*   if(micdiff > MIC_MIN_SENS) { */
00072 /*     sensors_changed(&sound_sensor); */
00073 /*   } */
00074 
00075 /*     if(micdiff > (avgmax >> 2)) { */
00076 /*       if(micdiff % 10 == 0) beep_beep(10); */
00077 /*       // Subtract a little... */
00078 /*       micdiff = micdiff - (micdiff >> 4); */
00079 /*     } */
00080 
00081 /*     if(micmax < micdiff) { */
00082 /*       micmax = micdiff; */
00083 /*     } */
00084 
00085 /*   if(micdiff > 2000) { */
00086 /*     leds_on(LEDS_GREEN); */
00087 /*   } */
00088 /*   if(micdiff > 3000) { */
00089 /*     leds_on(LEDS_YELLOW); */
00090 /*   } */
00091 /*   if(micdiff > 4000) { */
00092 /*     leds_on(LEDS_RED); */
00093 /*   } */
00094 
00095   return 0;
00096 }
00097 /*---------------------------------------------------------------------------*/
00098 static int
00099 value(int type)
00100 {
00101   /* try returning the max to see what values we get... */
00102 /*   int mictmp = micmax; */
00103 /*   avgmax = avgmax + micmax - (avgmax >> 3); */
00104 /*   micmax = micdiff; */
00105 /*   return mictmp; */
00106   return micdiff;
00107 }
00108 /*---------------------------------------------------------------------------*/
00109 static int
00110 configure(int type, int value)
00111 {
00112   switch(type) {
00113   case SENSORS_HW_INIT:
00114     /* Initialization of ADC12 done by irq */
00115     mode = 0;
00116     buffer_size = 0;
00117     return 1;
00118   case SENSORS_ACTIVE:
00119     if(value) {
00120       if(!irq_adc12_active(4)) {
00121         sound = micdiff = micmax = 0;
00122         mode = 0;
00123         ctr = 0;
00124         sample_div = 0;
00125         buf_pos = 0;
00126         avgmax = 5000;
00127         irq_adc12_activate(4, (INCH_0 + SREF_0), irq);
00128       }
00129     } else {
00130       irq_adc12_deactivate(4);
00131     }
00132     return 1;
00133   }
00134   return 0;
00135 }
00136 /*---------------------------------------------------------------------------*/
00137 static int
00138 status(int type)
00139 {
00140   switch(type) {
00141   case SENSORS_ACTIVE:
00142     return irq_adc12_active(4);
00143   case SENSORS_READY:
00144     return (mode != SAMPLE) && irq_adc12_active(4);
00145   }
00146   return 0;
00147 }
00148 /*---------------------------------------------------------------------------*/
00149 void
00150 sound_sensor_start_sample(void)
00151 {
00152   if(buffer_size > 0) {
00153     buf_pos = 0;
00154     ctr = 0;
00155     mode = SAMPLE;
00156   }
00157 }
00158 /*---------------------------------------------------------------------------*/
00159 void
00160 sound_sensor_set_buffer(int16_t *buffer, int buf_size, int divider)
00161 {
00162   sample_buffer = buffer;
00163   buffer_size = buf_size;
00164   sample_div = divider;
00165 }
00166 /*---------------------------------------------------------------------------*/
00167 SENSORS_SENSOR(sound_sensor, SOUND_SENSOR,
00168                value, configure, status);

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