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added fft test program sampling using the esb-mic.

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joxe 2008-04-25 16:34:31 +00:00
parent 7be3aeeeb5
commit faf0f2ea0a
1 changed files with 138 additions and 0 deletions
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examples/esb/fft-test.c Normal file
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/*
* 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 1.1 2008/04/25 16:34:31 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 16:34:31 $
* $Revision: 1.1 $
*/
#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 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, 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();
}