osd-contiki/examples/rf_environment/rf_environment.c
Robert Olsson b4ef18b2fa Keep cca scan function separated
modified:   examples/rf_environment/rf_environment.c
2017-05-23 21:07:59 +02:00

206 lines
5.2 KiB
C

/*
* Copyright (c) 2016, Robert Olsson KTH Royal Institute of Technology
* COS/Kista Stockholm roolss@kth.se
*
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "dev/radio.h"
#include "net/netstack.h"
#include "net/packetbuf.h"
#include "sys/process.h"
#include "sys/etimer.h"
#include <dev/watchdog.h>
#include "dev/leds.h"
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#define SAMPLES 1000
#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
PROCESS(rf_scan_process, "rf_scan process");
AUTOSTART_PROCESSES(&rf_scan_process);
/*
rf_environment runs clear channel assessment (CCA) test for over
all 802.15.4 channels and reports stats per channel. The CCA test
is run for different CCA thresholds from -60 to -190 dBm. CCA is a
non-destructive for the rf-environment it's just listens.
Best and worst channel is printed as average rf activity.
Originally developed for the Atmel avr-rss2 platform.
*/
static struct etimer et;
static int cca[16], cca_thresh, chan, i, j, k;
static uint16_t best, best_sum;
static uint16_t worst, worst_sum;
static double ave;
static radio_value_t
get_chan(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_PARAM_CHANNEL, &chan) ==
RADIO_RESULT_OK) {
return chan;
}
return 0;
}
static void
set_chan(uint8_t chan)
{
if(NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, chan) ==
RADIO_RESULT_OK) {
}
}
static radio_value_t
get_chan_min(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MIN, &chan) ==
RADIO_RESULT_OK) {
return chan;
}
return 0;
}
static radio_value_t
get_chan_max(void)
{
radio_value_t chan;
if(NETSTACK_RADIO.get_value(RADIO_CONST_CHANNEL_MAX, &chan) ==
RADIO_RESULT_OK) {
return chan;
}
return 0;
}
static radio_value_t
get_cca_thresh(void)
{
radio_value_t cca;
if(NETSTACK_RADIO.get_value(RADIO_PARAM_CCA_THRESHOLD, &cca) ==
RADIO_RESULT_OK) {
return cca;
}
return 0;
}
static radio_value_t
set_cca_thresh(radio_value_t thresh)
{
if(NETSTACK_RADIO.set_value(RADIO_PARAM_CCA_THRESHOLD, thresh) ==
RADIO_RESULT_OK) {
return RADIO_RESULT_OK;
}
return 0;
}
void
do_all_chan_cca(int *cca, int try)
{
int j;
for(j = 0; j < 16; j++) {
set_chan(j+11);
cca[j] = 0;
#ifdef CONTIKI_TARGET_AVR_RSS2
watchdog_periodic();
#endif
NETSTACK_RADIO.on();
for(i = 0; i < try; i++) {
cca[j] += NETSTACK_RADIO.channel_clear();
}
NETSTACK_RADIO.off();
}
}
PROCESS_THREAD(rf_scan_process, ev, data)
{
PROCESS_BEGIN();
leds_init();
leds_on(LEDS_RED);
leds_on(LEDS_YELLOW);
printf("Chan min=%d\n", get_chan_min());
chan = get_chan();
printf("Chan cur=%d\n", chan);
printf("Chan max=%d\n", get_chan_max());
cca_thresh = get_cca_thresh();
printf("Default CCA thresh=%d\n", cca_thresh);
etimer_set(&et, CLOCK_SECOND / 2);
while(1) {
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
for(k = -90; k <= -60; k += 2) {
set_cca_thresh(k);
do_all_chan_cca(cca, SAMPLES);
printf("cca_thresh=%-3ddBm", get_cca_thresh());
worst = 0;
worst_sum = 0xFFFF;
best = 0;
best_sum = 0;
ave = 0;
for(j = 0; j < 16; j++) {
ave += cca[j];
printf(" %3d", 100 - (100 * cca[j]) / SAMPLES);
if(cca[j] > best_sum) {
best_sum = cca[j];
best = j;
}
if(cca[j] < worst_sum) {
worst_sum = cca[j];
worst = j;
}
}
printf(" Best=%d Worst=%d Ave=%-5.2f\n", (best+11) , (worst+11), 100 - (100 * (ave / 16) / SAMPLES));
}
etimer_set(&et, CLOCK_SECOND / 2);
}
PROCESS_END();
}