/*
 * TI's TCS211 L1 does not use standard ARFCNs internally, instead it uses
 * its own non-standard radio_freq numbers in their place.  Other firmware
 * components and all external interfaces do use standard ARFCNs, thus
 * conversion functions are invoked at appropriate points in the firmware.
 * However, L1-internal radio_freq numbers are emitted in L1 debug traces,
 * thus anyone looking at these traces needs to be able to convert between
 * standard ARFCNs and L1-internal radio_freq.
 *
 * The present utility converts TI's radio_freq numbers as seen in L1 traces
 * into standard ARFCNs.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>

main(argc, argv)
	char **argv;
{
	int ti_num;

	if (argc != 3) {
usage:		fprintf(stderr, "usage: %s {eu|us} L1_radio_freq\n", argv[0]);
		exit(1);
	}
	ti_num = atoi(argv[2]);
	if (!strcmp(argv[1], "eu"))
		ti2arfcn_eu(ti_num);
	else if (!strcmp(argv[1], "us"))
		ti2arfcn_us(ti_num);
	else
		goto usage;
	exit(0);
}

ti2arfcn_eu(radio_freq)
{
	int arfcn;

	if (radio_freq < 1 || radio_freq > 548) {
		fprintf(stderr,
		"error: specified radio_freq is out of range for dual-EU\n");
		exit(1);
	}
	if (radio_freq < 175) {
		if (radio_freq <= 124)
			arfcn = radio_freq;
		else if (radio_freq < 174)
			arfcn = radio_freq - 125 + 975;
		else
			arfcn = 0;
	} else
		arfcn = radio_freq - 175 + 512;
	printf("%d\n", arfcn);
}

ti2arfcn_us(radio_freq)
{
	int arfcn;

	if (radio_freq < 1 || radio_freq > 423) {
		fprintf(stderr,
		"error: specified radio_freq is out of range for dual-US\n");
		exit(1);
	}
	if (radio_freq < 125)
		arfcn = radio_freq - 1 + 128;
	else
		arfcn = radio_freq - 125 + 512;
	printf("%d\n", arfcn);
}