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/*! \file osmo-arfcn.c
* Utility program for ARFCN / frequency calculations. */
/*
* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdio.h>
#include <getopt.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <osmocom/gsm/gsm_utils.h>
enum program_mode {
MODE_NONE,
MODE_A2F,
MODE_F2A,
};
static int arfcn2freq(int arfcn)
{
uint16_t freq10u, freq10d;
if (arfcn < 0 || arfcn > 0xffff) {
fprintf(stderr, "Invalid ARFCN %d\n", arfcn);
return -EINVAL;
}
freq10u = gsm_arfcn2freq10(arfcn, 1);
freq10d = gsm_arfcn2freq10(arfcn, 0);
if (freq10u == 0xffff || freq10d == 0xffff) {
fprintf(stderr, "Error during conversion of ARFCN %d\n",
arfcn);
return -EINVAL;
}
printf("ARFCN %4d: Uplink %4u.%1u MHz / Downlink %4u.%1u MHz\n",
arfcn & ~ARFCN_FLAG_MASK,
freq10u/10, freq10u%10, freq10d/10, freq10d%10);
return 0;
}
static int freq2arfcn(int freq10, int uplink)
{
uint16_t arfcn;
enum gsm_band band;
if (uplink != 0 && uplink != 1) {
fprintf(stderr, "Need to specify uplink or downlink\n");
return -EINVAL;
}
arfcn = gsm_freq102arfcn(freq10, uplink);
if (arfcn == 0xffff) {
fprintf(stderr, "Unable to find matching ARFCN\n");
return -EINVAL;
}
if (gsm_arfcn2band_rc(arfcn, &band) < 0) {
fprintf(stderr, "ARFCN contains no valid band\n");
return -EINVAL;
}
printf("%s: ARFCN %4d\n",
gsm_band_name(band),
arfcn & ~ARFCN_FLAG_MASK);
return 0;
}
static void help(const char *progname)
{
printf("Usage: %s [-h] [-p] [-a arfcn] [-f freq] [-u|-d]\n",
progname);
}
int main(int argc, char **argv)
{
int arfcn, freq, pcs = 0, uplink = -1;
int opt;
char *param;
enum program_mode mode = MODE_NONE;
while ((opt = getopt(argc, argv, "pa:f:udh")) != -1) {
switch (opt) {
case 'p':
pcs = 1;
break;
case 'a':
mode = MODE_A2F;
param = optarg;
break;
case 'f':
mode = MODE_F2A;
param = optarg;
break;
case 'u':
uplink = 1;
break;
case 'd':
uplink = 0;
break;
case 'h':
help(argv[0]);
exit(0);
break;
default:
break;
}
}
if (argc > optind) {
fprintf(stderr, "Unsupported positional arguments in command line\n");
exit(2);
}
switch (mode) {
case MODE_NONE:
help(argv[0]);
exit(2);
break;
case MODE_A2F:
arfcn = atoi(param);
if (pcs)
arfcn |= ARFCN_PCS;
arfcn2freq(arfcn);
break;
case MODE_F2A:
freq = (int)(atof(param) * 10.0f);
freq2arfcn(freq, uplink);
break;
}
exit(0);
}
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