109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2010, Loughborough University - 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.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Minimalistic channel energy detection.
|
|
*
|
|
* \author
|
|
* George Oikonomou - <oikonomou@users.sourceforge.net>
|
|
*/
|
|
|
|
#include "contiki.h"
|
|
#include "cc2430_sfr.h"
|
|
|
|
#include "debug.h"
|
|
#include "dev/cc2430_rf.h"
|
|
#include <stdio.h>
|
|
|
|
static uint8_t channel;
|
|
static int8_t j;
|
|
static int8_t cmax;
|
|
static int8_t rssi;
|
|
static struct etimer et;
|
|
static rtimer_clock_t t0;
|
|
|
|
#define RSSI_BASE -50
|
|
#define RSSI_SAMPLES 30
|
|
#define SAMPLE_INTERVAL (CLOCK_SECOND)
|
|
#define CHANNEL_MIN 11
|
|
#define CHANNEL_MAX 26
|
|
/* ToDo: Do this in infinite RX. Take more samples */
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS(energy_scan, "Energy Scanner");
|
|
AUTOSTART_PROCESSES(&energy_scan);
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS_THREAD(energy_scan, ev, data)
|
|
{
|
|
|
|
PROCESS_BEGIN();
|
|
|
|
printf("Energy Scanner\n");
|
|
printf("CCA Threshold: %d\n", (int8_t)RSSIH);
|
|
printf("Channel scan range: [%u , %u]\n", CHANNEL_MIN, CHANNEL_MAX);
|
|
printf("%u samples per channel, interval %u ticks\n",
|
|
RSSI_SAMPLES, SAMPLE_INTERVAL);
|
|
|
|
channel = CHANNEL_MIN;
|
|
while(1) {
|
|
cmax = RSSI_BASE;
|
|
cc2430_rf_channel_set(channel);
|
|
clock_delay_usec(200);
|
|
|
|
for(j = 0; j < RSSI_SAMPLES; j++) {
|
|
t0 = RTIMER_NOW();
|
|
rssi = RSSIL;
|
|
if(rssi > cmax) {
|
|
cmax = rssi;
|
|
}
|
|
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + 25));
|
|
}
|
|
printf("%u [%3d]: ", channel, cmax);
|
|
for(j = RSSI_BASE; j <= cmax; j++) {
|
|
printf("#");
|
|
}
|
|
printf("\n");
|
|
if(channel == CHANNEL_MAX) {
|
|
printf("===============\n");
|
|
channel = CHANNEL_MIN;
|
|
} else {
|
|
channel++;
|
|
}
|
|
|
|
etimer_set(&et, SAMPLE_INTERVAL);
|
|
PROCESS_YIELD();
|
|
|
|
}
|
|
|
|
PROCESS_END();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|