added fft test program sampling using the esb-mic.
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examples/esb/fft-test.c
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138
examples/esb/fft-test.c
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/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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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 the Institute 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 THE INSTITUTE 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 THE INSTITUTE 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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* $Id: fft-test.c,v 1.1 2008/04/25 16:34:31 joxe Exp $
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*
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* -----------------------------------------------------------------
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* fft-test - a test program that use the sound sensor for sampling
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* some data and then performs an FFT on that. Then flashes leds based
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* on energy-level and position of highest frequency band.
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*
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* Author : Joakim Eriksson
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* Created : 2008-04-04
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* Updated : $Date: 2008/04/25 16:34:31 $
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* $Revision: 1.1 $
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*/
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#include "contiki-esb.h"
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#include "dev/sound-sensor.h"
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#include <stdio.h>
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#include "lib/ifft.h"
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#define FFT_TEST_SIZE 128
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PROCESS(fft_process, "Fft");
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AUTOSTART_PROCESSES(&fft_process);
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PROCESS_THREAD(fft_process, ev, data)
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{
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static struct etimer etimer;
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static int on = 0;
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static int i = 0;
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static int mode = 0;
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static int16_t fftBuf[FFT_TEST_SIZE];
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static int max_value = 0;
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static int max_pos = 0;
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PROCESS_EXITHANDLER(goto exit);
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PROCESS_BEGIN();
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etimer_set(&etimer, CLOCK_SECOND * 4);
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button_sensor.activate();
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/* start and configure the sound sensor for sampling */
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sound_sensor.activate();
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sound_sensor.configure(SOUND_SET_BUFFER_PTR, fftBuf);
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sound_sensor.configure(SOUND_SET_BUFFER_SIZE, (void *) FFT_TEST_SIZE);
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sound_sensor.configure(SOUND_SET_DIV, (void *) 1);
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == sensors_event) {
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if(data == &button_sensor) {
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beep_beep(100);
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mode = !mode;
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} else if(data == &sound_sensor) {
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for(i = 0; i < FFT_TEST_SIZE; i++) {
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fftBuf[i] = -128 + (fftBuf[i] >> 4);
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if(!mode) {
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/* just print the samples if mode = 0 */
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if(i > 0) {
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printf(" ");
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}
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printf("%d", fftBuf[i]);
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}
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}
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if (mode) {
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/* Calculate fft, print result, and find index of
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highest energy level */
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ifft(fftBuf, FFT_TEST_SIZE);
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max_value = 0;
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max_pos = 0;
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for (i = 0; i < FFT_TEST_SIZE/2; i++) {
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if(i > 0) {
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printf(" ");
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}
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printf("%d", fftBuf[i]);
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if(max_value < fftBuf[i]) {
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max_value = fftBuf[i];
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max_pos = i;
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}
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}
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/* flash leds based on energy level and position of max */
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if(max_value < 400 || max_pos < 2) {
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leds_off(LEDS_ALL);
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} else if (max_pos > 1 && max_pos < 15) {
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leds_on(LEDS_GREEN);
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} else if(max_pos < 25) {
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leds_on(LEDS_YELLOW);
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} else {
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leds_on(LEDS_RED);
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}
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}
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printf("\n");
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printf("#Maxval: %d, maxpos: %d\n", max_value, max_pos);
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}
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} else if(ev == PROCESS_EVENT_TIMER) {
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if(data == &etimer) {
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if(on) {
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sound_sensor.configure(SOUND_START_SAMPLE, NULL);
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leds_off(LEDS_ALL);
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}
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etimer_set(&etimer, CLOCK_SECOND / 2);
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on = !on;
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}
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}
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}
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exit:
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leds_off(LEDS_ALL);
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PROCESS_END();
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}
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