add new 'osmo-arfcn' program to compute frequency based on arfcn
The freq -> arfcn side still needs to be implemented.
diff --git a/utils/osmo-arfcn.c b/utils/osmo-arfcn.c
new file mode 100644
index 0000000..15adbca
--- /dev/null
+++ b/utils/osmo-arfcn.c
@@ -0,0 +1,103 @@
+/* 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(char *arfcn_str)
+{
+ int arfcn = atoi(arfcn_str);
+ 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, freq10u/10, freq10u%10, freq10d/10, freq10d%10);
+
+ return 0;
+}
+
+static void help(const char *progname)
+{
+ printf("Usage: %s [-h] [-a arfcn] [-f freq] [-u|-d]\n",
+ progname);
+}
+
+int main(int argc, char **argv)
+{
+ int opt;
+ char *param;
+ enum program_mode mode = MODE_NONE;
+
+ while ((opt = getopt(argc, argv, "a:f:ud")) != -1) {
+ switch (opt) {
+ case 'a':
+ mode = MODE_A2F;
+ param = optarg;
+ break;
+ case 'f':
+ mode = MODE_F2A;
+ param = optarg;
+ break;
+ case 'h':
+ help(argv[0]);
+ exit(0);
+ break;
+ default:
+ break;
+ }
+ }
+
+ switch (mode) {
+ case MODE_NONE:
+ help(argv[0]);
+ exit(2);
+ break;
+ case MODE_A2F:
+ arfcn2freq(param);
+ break;
+ }
+
+ exit(0);
+}