/*
 * 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 a standard ARFCN into TI L1 radio_freq.
 */

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

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

	if (argc != 3) {
usage:		fprintf(stderr, "usage: %s {eu|us} arfcn\n", argv[0]);
		exit(1);
	}
	arfcn = atoi(argv[2]);
	if (!strcmp(argv[1], "eu"))
		arfcn2ti_eu(arfcn);
	else if (!strcmp(argv[1], "us"))
		arfcn2ti_us(arfcn);
	else
		goto usage;
	exit(0);
}

arfcn2ti_eu(arfcn)
{
	if (arfcn == 0)
		arfcn = 174;
	else if ((arfcn >= 975) && (arfcn <= 1023))
		arfcn -= 850;
	else if ((arfcn >= 512) && (arfcn <= 885))
		arfcn -= 337;
	else if ((arfcn >= 1) && (arfcn <= 124))
		;
	else {
		fprintf(stderr,
			"error: specified ARFCN is invalid for dual-EU\n");
		exit(1);
	}
	printf("%d\n", arfcn);
}

arfcn2ti_us(arfcn)
{
	if ((arfcn >= 128) && (arfcn <= 251))
		arfcn -= 127;
	else if ((arfcn >= 512) && (arfcn <= 810))
		arfcn -= 387;
	else {
		fprintf(stderr,
			"error: specified ARFCN is invalid for dual-US\n");
		exit(1);
	}
	printf("%d\n", arfcn);
}