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tools: new utility atrf-path to measure path characteristics

- Makefile (DIRS): added atrf-path
- atrf-path/Makefile, atrf-path/atrf-path.c: new utility atrf-path to
  measure path characteristics (for now, TX-to-RX path attenuation)
- atrf-path/plot: visualize path loss measurements
This commit is contained in:
Werner Almesberger 2011-04-12 19:43:45 -03:00
parent 09e5d28768
commit a2e0e1d807
4 changed files with 223 additions and 1 deletions

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@ -11,7 +11,7 @@
#
DIRS=atrf-id atrf-proxy atrf-reset atrf-rssi atrf-trim atrf-txrx \
DIRS=atrf-id atrf-path atrf-proxy atrf-reset atrf-rssi atrf-trim atrf-txrx \
atrf-xtal
TARGET_ONLY_DIRS=lib

16
tools/atrf-path/Makefile Normal file
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@ -0,0 +1,16 @@
#
# atrf-path/Makefile - Measure path characteristics
#
# Written 2011 by Werner Almesberger
# Copyright 2011 Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
MAIN = atrf-path
include ../Makefile.common

183
tools/atrf-path/atrf-path.c Normal file
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@ -0,0 +1,183 @@
/*
* atrf-path/atrf-path.c - Measure path characteristics
*
* Written 2011 by Werner Almesberger
* Copyright 2011 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "at86rf230.h"
#include "misctxrx.h"
#include "cwtest.h"
#include "atrf.h"
#define DEFAULT_TRIM 8
#define DEFAULT_POWER 15
static void init_common(struct atrf_dsc *dsc, int trim, int chan)
{
atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_TRX_OFF);
atrf_reg_write(dsc, REG_XOSC_CTRL,
(XTAL_MODE_INT << XTAL_MODE_SHIFT) | trim);
atrf_set_clkm(dsc, 0);
atrf_reg_write(dsc, REG_PHY_CC_CCA, (1 << CCA_MODE_SHIFT) | chan);
}
static void init_tx(struct atrf_dsc *dsc, int trim, int power, int chan)
{
init_common(dsc, trim, chan);
set_power_step(dsc, power, 0);
}
static void init_rx(struct atrf_dsc *dsc, int trim, int chan)
{
init_common(dsc, trim, chan);
atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_RX_ON);
}
static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
int power, int chan, int cont_tx, int samples)
{
int i, rssi = 0;
double offset = tx_power_step2dBm(tx, power);
init_tx(tx, trim_tx, power, chan);
usleep(155); /* table 7-2, tTR19 */
cw_test_begin(tx, cont_tx);
/* table 7-1, tTR10, doubling since it's a "typical" value */
usleep(2*16);
for (i = 0; i != samples; i++) {
/* according to 8.3.2, PHY_RSSI is updated every 2 us */
usleep(2);
rssi += atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
}
cw_test_end(tx);
printf("%.1f %.1f\n",
2350+5*chan+(cont_tx == CONT_TX_M500K ? -0.5 : 0.5),
-91+3*(rssi-1.0)/samples-offset);
}
static void do_sweeps(struct atrf_dsc *tx, struct atrf_dsc *rx,
int trim_tx, int trim_rx, int power, int sweeps, int samples)
{
int i, chan;
for (i = 0; i != sweeps; i++) {
if (i)
putchar('\n');
for (chan = 11; chan <= 26; chan++) {
init_rx(rx, trim_rx, chan);
sample(tx, rx, trim_tx, power, chan, CONT_TX_M500K,
samples);
sample(tx, rx, trim_tx, power, chan, CONT_TX_P500K,
samples);
}
}
}
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [-p power] [-t trim_tx [-t trim_rx]] driver_tx[:arg]\n"
"%16s driver_rx[:arg] [sweeps [samples]]\n\n"
" -p power transmit power, 0 to 15 (default %d)\n"
" -t trim trim capacitor, 0 to 15 (default %d)\n"
, name, "", DEFAULT_POWER, DEFAULT_TRIM);
exit(1);
}
int main(int argc, char **argv)
{
const char *tx_drv, *rx_drv;
struct atrf_dsc *tx, *rx;
int trim_tx = -1, trim_rx = DEFAULT_TRIM;
int power = DEFAULT_POWER;
int sweeps = 1, samples = 1;
unsigned long tmp;
char *end;
int c;
while ((c = getopt(argc, argv, "p:t:")) != EOF)
switch (c) {
case 'p':
tmp = strtoul(optarg, &end, 0);
if (*end || tmp > 15)
usage(*argv);
power = tmp;
break;
case 't':
tmp = strtoul(optarg, &end, 0);
if (*end || tmp > 15)
usage(*argv);
if (trim_tx == -1)
trim_tx = tmp;
else
trim_rx = tmp;
break;
default:
usage(*argv);
}
if (trim_tx == -1)
trim_tx = DEFAULT_TRIM;
switch (argc-optind) {
case 4:
samples = strtoul(argv[optind+3], &end, 0);
if (*end)
usage(*argv);
/* fall through */
case 3:
sweeps = strtoul(argv[optind+2], &end, 0);
if (*end)
usage(*argv);
/* fall through */
case 2:
tx_drv = argv[optind];
rx_drv = argv[optind+1];
break;
default:
usage(*argv);
}
tx = atrf_open(tx_drv);
if (!tx)
return 1;
rx = atrf_open(rx_drv);
if (!rx)
return 1;
do_sweeps(tx, rx, trim_tx, trim_rx, 15-power, sweeps, samples);
atrf_reg_write(tx, REG_TRX_STATE, TRX_CMD_TRX_OFF);
atrf_reg_write(rx, REG_TRX_STATE, TRX_CMD_TRX_OFF);
atrf_close(tx);
atrf_close(rx);
return 0;
}

23
tools/atrf-path/plot Executable file
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@ -0,0 +1,23 @@
#!/bin/sh
usage()
{
echo "usage: file ..." 1>&2
exit 1
}
[ "$1" ] || usage
files=
while [ "$1" ]; do
[ "$files" ] && files="$files, "
files="$files\"$1\""
shift
done
gnuplot -persist <<EOF
set yrange [-94:-10]
set ylabel "RX-TX power (dBm)"
set xlabel "Frequency (MHz)"
set style data lines
plot $files
EOF