140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 2008, 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.
|
|
*
|
|
* $Id: fft-test.c,v 1.2 2008/04/25 22:12:25 joxe Exp $
|
|
*
|
|
* -----------------------------------------------------------------
|
|
* fft-test - a test program that use the sound sensor for sampling
|
|
* some data and then performs an FFT on that. Then flashes leds based
|
|
* on energy-level and position of highest frequency band.
|
|
*
|
|
* Author : Joakim Eriksson
|
|
* Created : 2008-04-04
|
|
* Updated : $Date: 2008/04/25 22:12:25 $
|
|
* $Revision: 1.2 $
|
|
*/
|
|
|
|
#include "contiki-esb.h"
|
|
#include "dev/sound-sensor.h"
|
|
#include <stdio.h>
|
|
#include "lib/ifft.h"
|
|
|
|
#define FFT_TEST_SIZE 128
|
|
|
|
PROCESS(fft_process, "Fft");
|
|
|
|
AUTOSTART_PROCESSES(&fft_process);
|
|
|
|
PROCESS_THREAD(fft_process, ev, data)
|
|
{
|
|
static struct etimer etimer;
|
|
static int on = 0;
|
|
static int i = 0;
|
|
static int mode = 0;
|
|
static int16_t fftBuf[FFT_TEST_SIZE];
|
|
static int16_t tmpBuf[FFT_TEST_SIZE];
|
|
static int max_value = 0;
|
|
static int max_pos = 0;
|
|
|
|
PROCESS_EXITHANDLER(goto exit);
|
|
PROCESS_BEGIN();
|
|
|
|
etimer_set(&etimer, CLOCK_SECOND * 4);
|
|
button_sensor.activate();
|
|
/* start and configure the sound sensor for sampling */
|
|
sound_sensor.activate();
|
|
sound_sensor.configure(SOUND_SET_BUFFER_PTR, fftBuf);
|
|
sound_sensor.configure(SOUND_SET_BUFFER_SIZE, (void *) FFT_TEST_SIZE);
|
|
sound_sensor.configure(SOUND_SET_DIV, (void *) 1);
|
|
while(1) {
|
|
|
|
PROCESS_WAIT_EVENT();
|
|
|
|
if(ev == sensors_event) {
|
|
if(data == &button_sensor) {
|
|
beep_beep(100);
|
|
mode = !mode;
|
|
} else if(data == &sound_sensor) {
|
|
for(i = 0; i < FFT_TEST_SIZE; i++) {
|
|
fftBuf[i] = -128 + (fftBuf[i] >> 4);
|
|
if(!mode) {
|
|
/* just print the samples if mode = 0 */
|
|
if(i > 0) {
|
|
printf(" ");
|
|
}
|
|
printf("%d", fftBuf[i]);
|
|
}
|
|
}
|
|
if (mode) {
|
|
/* Calculate fft, print result, and find index of
|
|
highest energy level */
|
|
ifft(fftBuf, tmpBuf, FFT_TEST_SIZE);
|
|
max_value = 0;
|
|
max_pos = 0;
|
|
for (i = 0; i < FFT_TEST_SIZE/2; i++) {
|
|
if(i > 0) {
|
|
printf(" ");
|
|
}
|
|
printf("%d", fftBuf[i]);
|
|
|
|
if(max_value < fftBuf[i]) {
|
|
max_value = fftBuf[i];
|
|
max_pos = i;
|
|
}
|
|
}
|
|
/* flash leds based on energy level and position of max */
|
|
if(max_value < 400 || max_pos < 2) {
|
|
leds_off(LEDS_ALL);
|
|
} else if (max_pos > 1 && max_pos < 15) {
|
|
leds_on(LEDS_GREEN);
|
|
} else if(max_pos < 25) {
|
|
leds_on(LEDS_YELLOW);
|
|
} else {
|
|
leds_on(LEDS_RED);
|
|
}
|
|
}
|
|
printf("\n");
|
|
printf("#Maxval: %d, maxpos: %d\n", max_value, max_pos);
|
|
}
|
|
} else if(ev == PROCESS_EVENT_TIMER) {
|
|
if(data == &etimer) {
|
|
if(on) {
|
|
sound_sensor.configure(SOUND_START_SAMPLE, NULL);
|
|
leds_off(LEDS_ALL);
|
|
}
|
|
etimer_set(&etimer, CLOCK_SECOND / 2);
|
|
on = !on;
|
|
}
|
|
}
|
|
}
|
|
|
|
exit:
|
|
leds_off(LEDS_ALL);
|
|
PROCESS_END();
|
|
}
|