206 lines
5.2 KiB
C
206 lines
5.2 KiB
C
/*
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* Copyright (c) 2016, Robert Olsson KTH Royal Institute of Technology
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* COS/Kista Stockholm roolss@kth.se
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*
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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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*
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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 copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "dev/radio.h"
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#include "net/netstack.h"
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#include "net/packetbuf.h"
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#include "sys/process.h"
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#include "sys/etimer.h"
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#include <dev/watchdog.h>
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#include "dev/leds.h"
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#include <string.h>
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#include <stdint.h>
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#include <stdio.h>
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#define SAMPLES 1000
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#define DEBUG 1
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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PROCESS(rf_scan_process, "rf_scan process");
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AUTOSTART_PROCESSES(&rf_scan_process);
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/*
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rf_environment runs clear channel assessment (CCA) test for over
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all 802.15.4 channels and reports stats per channel. The CCA test
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is run for different CCA thresholds from -60 to -190 dBm. CCA is a
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non-destructive for the rf-environment it's just listens.
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Best and worst channel is printed as average rf activity.
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Originally developed for the Atmel avr-rss2 platform.
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*/
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static struct etimer et;
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static int cca[16], cca_thresh, chan, i, j, k;
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static uint16_t best, best_sum;
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static uint16_t worst, worst_sum;
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static double ave;
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static radio_value_t
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get_chan(void)
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{
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radio_value_t chan;
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if(NETSTACK_RADIO.get_value(RADIO_PARAM_CHANNEL, &chan) ==
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RADIO_RESULT_OK) {
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return chan;
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}
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return 0;
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}
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static void
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set_chan(uint8_t chan)
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{
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if(NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, chan) ==
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RADIO_RESULT_OK) {
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}
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}
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static radio_value_t
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get_chan_min(void)
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{
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radio_value_t chan;
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if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MIN, &chan) ==
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RADIO_RESULT_OK) {
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return chan;
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}
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return 0;
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}
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static radio_value_t
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get_chan_max(void)
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{
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radio_value_t chan;
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if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MAX, &chan) ==
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RADIO_RESULT_OK) {
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return chan;
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}
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return 0;
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}
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static radio_value_t
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get_cca_thresh(void)
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{
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radio_value_t cca;
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if(NETSTACK_RADIO.get_value(RADIO_PARAM_CCA_THRESHOLD, &cca) ==
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RADIO_RESULT_OK) {
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return cca;
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}
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return 0;
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}
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static radio_value_t
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set_cca_thresh(radio_value_t thresh)
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{
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if(NETSTACK_RADIO.set_value(RADIO_PARAM_CCA_THRESHOLD, thresh) ==
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RADIO_RESULT_OK) {
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return RADIO_RESULT_OK;
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}
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return 0;
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}
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void
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do_all_chan_cca(int *cca, int try)
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{
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int j;
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for(j = 0; j < 16; j++) {
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set_chan(j+11);
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cca[j] = 0;
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#ifdef CONTIKI_TARGET_AVR_RSS2
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watchdog_periodic();
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#endif
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NETSTACK_RADIO.on();
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for(i = 0; i < try; i++) {
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cca[j] += NETSTACK_RADIO.channel_clear();
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}
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NETSTACK_RADIO.off();
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}
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}
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PROCESS_THREAD(rf_scan_process, ev, data)
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{
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PROCESS_BEGIN();
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leds_init();
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leds_on(LEDS_RED);
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leds_on(LEDS_YELLOW);
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printf("Chan min=%d\n", get_chan_min());
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chan = get_chan();
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printf("Chan cur=%d\n", chan);
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printf("Chan max=%d\n", get_chan_max());
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cca_thresh = get_cca_thresh();
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printf("Default CCA thresh=%d\n", cca_thresh);
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etimer_set(&et, CLOCK_SECOND / 2);
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
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for(k = -90; k <= -60; k += 2) {
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set_cca_thresh(k);
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do_all_chan_cca(cca, SAMPLES);
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printf("cca_thresh=%-3ddBm", get_cca_thresh());
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worst = 0;
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worst_sum = 0xFFFF;
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best = 0;
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best_sum = 0;
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ave = 0;
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for(j = 0; j < 16; j++) {
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ave += cca[j];
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printf(" %3d", 100 - (100 * cca[j]) / SAMPLES);
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if(cca[j] > best_sum) {
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best_sum = cca[j];
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best = j;
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}
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if(cca[j] < worst_sum) {
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worst_sum = cca[j];
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worst = j;
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}
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}
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printf(" Best=%d Worst=%d Ave=%-5.2f\n", (best+11) , (worst+11), 100 - (100 * (ave / 16) / SAMPLES));
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}
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etimer_set(&et, CLOCK_SECOND / 2);
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}
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PROCESS_END();
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}
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