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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
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@ -11,7 +11,7 @@
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#
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DIRS=atrf-id atrf-proxy atrf-reset atrf-rssi atrf-trim atrf-txrx \
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DIRS=atrf-id atrf-path atrf-proxy atrf-reset atrf-rssi atrf-trim atrf-txrx \
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atrf-xtal
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TARGET_ONLY_DIRS=lib
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16
tools/atrf-path/Makefile
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16
tools/atrf-path/Makefile
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#
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# atrf-path/Makefile - Measure path characteristics
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#
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# Written 2011 by Werner Almesberger
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# Copyright 2011 Werner Almesberger
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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MAIN = atrf-path
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include ../Makefile.common
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183
tools/atrf-path/atrf-path.c
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183
tools/atrf-path/atrf-path.c
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/*
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* atrf-path/atrf-path.c - Measure path characteristics
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "at86rf230.h"
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#include "misctxrx.h"
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#include "cwtest.h"
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#include "atrf.h"
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#define DEFAULT_TRIM 8
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#define DEFAULT_POWER 15
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static void init_common(struct atrf_dsc *dsc, int trim, int chan)
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{
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atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_TRX_OFF);
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atrf_reg_write(dsc, REG_XOSC_CTRL,
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(XTAL_MODE_INT << XTAL_MODE_SHIFT) | trim);
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atrf_set_clkm(dsc, 0);
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atrf_reg_write(dsc, REG_PHY_CC_CCA, (1 << CCA_MODE_SHIFT) | chan);
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}
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static void init_tx(struct atrf_dsc *dsc, int trim, int power, int chan)
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{
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init_common(dsc, trim, chan);
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set_power_step(dsc, power, 0);
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}
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static void init_rx(struct atrf_dsc *dsc, int trim, int chan)
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{
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init_common(dsc, trim, chan);
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atrf_reg_write(dsc, REG_TRX_STATE, TRX_CMD_RX_ON);
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}
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static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
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int power, int chan, int cont_tx, int samples)
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{
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int i, rssi = 0;
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double offset = tx_power_step2dBm(tx, power);
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init_tx(tx, trim_tx, power, chan);
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usleep(155); /* table 7-2, tTR19 */
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cw_test_begin(tx, cont_tx);
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/* table 7-1, tTR10, doubling since it's a "typical" value */
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usleep(2*16);
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for (i = 0; i != samples; i++) {
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/* according to 8.3.2, PHY_RSSI is updated every 2 us */
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usleep(2);
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rssi += atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
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}
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cw_test_end(tx);
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printf("%.1f %.1f\n",
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2350+5*chan+(cont_tx == CONT_TX_M500K ? -0.5 : 0.5),
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-91+3*(rssi-1.0)/samples-offset);
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}
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static void do_sweeps(struct atrf_dsc *tx, struct atrf_dsc *rx,
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int trim_tx, int trim_rx, int power, int sweeps, int samples)
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{
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int i, chan;
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for (i = 0; i != sweeps; i++) {
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if (i)
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putchar('\n');
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for (chan = 11; chan <= 26; chan++) {
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init_rx(rx, trim_rx, chan);
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sample(tx, rx, trim_tx, power, chan, CONT_TX_M500K,
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samples);
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sample(tx, rx, trim_tx, power, chan, CONT_TX_P500K,
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samples);
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}
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}
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [-p power] [-t trim_tx [-t trim_rx]] driver_tx[:arg]\n"
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"%16s driver_rx[:arg] [sweeps [samples]]\n\n"
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" -p power transmit power, 0 to 15 (default %d)\n"
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" -t trim trim capacitor, 0 to 15 (default %d)\n"
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, name, "", DEFAULT_POWER, DEFAULT_TRIM);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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const char *tx_drv, *rx_drv;
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struct atrf_dsc *tx, *rx;
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int trim_tx = -1, trim_rx = DEFAULT_TRIM;
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int power = DEFAULT_POWER;
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int sweeps = 1, samples = 1;
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unsigned long tmp;
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char *end;
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int c;
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while ((c = getopt(argc, argv, "p:t:")) != EOF)
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switch (c) {
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case 'p':
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tmp = strtoul(optarg, &end, 0);
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if (*end || tmp > 15)
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usage(*argv);
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power = tmp;
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break;
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case 't':
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tmp = strtoul(optarg, &end, 0);
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if (*end || tmp > 15)
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usage(*argv);
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if (trim_tx == -1)
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trim_tx = tmp;
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else
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trim_rx = tmp;
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break;
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default:
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usage(*argv);
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}
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if (trim_tx == -1)
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trim_tx = DEFAULT_TRIM;
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switch (argc-optind) {
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case 4:
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samples = strtoul(argv[optind+3], &end, 0);
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if (*end)
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usage(*argv);
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/* fall through */
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case 3:
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sweeps = strtoul(argv[optind+2], &end, 0);
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if (*end)
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usage(*argv);
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/* fall through */
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case 2:
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tx_drv = argv[optind];
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rx_drv = argv[optind+1];
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break;
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default:
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usage(*argv);
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}
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tx = atrf_open(tx_drv);
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if (!tx)
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return 1;
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rx = atrf_open(rx_drv);
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if (!rx)
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return 1;
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do_sweeps(tx, rx, trim_tx, trim_rx, 15-power, sweeps, samples);
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atrf_reg_write(tx, REG_TRX_STATE, TRX_CMD_TRX_OFF);
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atrf_reg_write(rx, REG_TRX_STATE, TRX_CMD_TRX_OFF);
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atrf_close(tx);
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atrf_close(rx);
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return 0;
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}
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23
tools/atrf-path/plot
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23
tools/atrf-path/plot
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@ -0,0 +1,23 @@
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#!/bin/sh
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usage()
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{
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echo "usage: file ..." 1>&2
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exit 1
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}
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[ "$1" ] || usage
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files=
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while [ "$1" ]; do
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[ "$files" ] && files="$files, "
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files="$files\"$1\""
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shift
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done
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gnuplot -persist <<EOF
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set yrange [-94:-10]
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set ylabel "RX-TX power (dBm)"
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set xlabel "Frequency (MHz)"
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set style data lines
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plot $files
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EOF
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