osmo-bts/tests/bursts/bursts_test.c

/* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
 *
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 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 Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#include <osmocom/core/bits.h>
#include <osmocom/core/utils.h>

#include "../../src/osmo-bts-trx/xcch.h"
#include "../../src/osmo-bts-trx/rach.h"
#include "../../src/osmo-bts-trx/sch.h"


#define ASSERT_TRUE(rc) \
	if (!(rc)) { \
		printf("Assert failed in %s:%d.\n",  \
		       __FILE__, __LINE__);          \
		abort();			     \
	}

/* set condition to 1, to show debugging */
#define printd if (0) printf

static int ubits2sbits(ubit_t *ubits, sbit_t *sbits, int count)
{
	int i;

	for (i = 0; i < count; i++) {
		if ((*ubits++) & 1)
			*sbits++ = -127;
		else
			*sbits++ = 127;
	}

	return count;
}

static void test_xcch(uint8_t *l2)
{
	uint8_t result[23];
	ubit_t bursts_u[116 * 4];
	sbit_t bursts_s[116 * 4];

	printd("Encoding: %s\n", osmo_hexdump(l2, 23));

	/* encode */
	xcch_encode(bursts_u, l2);

	printd("U-Bits:\n");
	printd("%s %02x  %02x  %s\n", osmo_hexdump(bursts_u, 57),
		bursts_u[57], bursts_u[58],
		osmo_hexdump(bursts_u + 59, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump(bursts_u + 116, 57),
		bursts_u[57 + 116], bursts_u[58 + 116],
		osmo_hexdump(bursts_u + 59 + 116, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump(bursts_u + 232, 57),
		bursts_u[57 + 232], bursts_u[58 + 232],
		osmo_hexdump(bursts_u + 59 + 232, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump(bursts_u + 348, 57),
		bursts_u[57 + 348], bursts_u[58 + 348],
		osmo_hexdump(bursts_u + 59 + 348, 57));
	ubits2sbits(bursts_u, bursts_s, 116 * 4);
	printd("S-Bits:\n");
	printd("%s %02x  %02x  %s\n", osmo_hexdump((uint8_t *)bursts_s, 57),
		(uint8_t)bursts_s[57], (uint8_t)bursts_s[58],
		osmo_hexdump((uint8_t *)bursts_s + 59, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump((uint8_t *)bursts_s + 116, 57),
		(uint8_t)bursts_s[57 + 116], (uint8_t)bursts_s[58 + 116],
		osmo_hexdump((uint8_t *)bursts_s + 59 + 116, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump((uint8_t *)bursts_s + 232, 57),
		(uint8_t)bursts_s[57 + 232], (uint8_t)bursts_s[58 + 232],
		osmo_hexdump((uint8_t *)bursts_s + 59 + 232, 57));
	printd("%s %02x  %02x  %s\n", osmo_hexdump((uint8_t *)bursts_s + 348, 57),
		(uint8_t)bursts_s[57 + 348], (uint8_t)bursts_s[58 + 348],
		osmo_hexdump((uint8_t *)bursts_s + 59 + 348, 57));

	/* destroy */
	memset(bursts_s, 0, 30);
	memset(bursts_s + 116, 0, 30);

	/* decode */
	xcch_decode(result, bursts_s);

	printd("Decoded: %s\n", osmo_hexdump(result, 23));

	ASSERT_TRUE(!memcmp(l2, result, 23));

	printd("\n");
}

static void test_rach(uint8_t bsic, uint8_t ra)
{
	uint8_t result;
	ubit_t bursts_u[36];
	sbit_t bursts_s[36];

	printd("Encoding: %02x\n", ra);

	/* encode */
	rach_encode(bursts_u, &ra, bsic);

	printd("U-Bits:\n");
	printd("%s\n", osmo_hexdump(bursts_u, 36));
	ubits2sbits(bursts_u, bursts_s, 36);
	printd("S-Bits:\n");
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s, 36));

	/* destroy */
	memset(bursts_s + 6, 0, 8);

	/* decode */
	rach_decode(&result, bursts_s, bsic);

	printd("Decoded: %02x\n", result);

	ASSERT_TRUE(ra == result);

	printd("\n");
}

static void test_sch(uint8_t *info)
{
	uint8_t result[4];
	ubit_t bursts_u[78];
	sbit_t bursts_s[78];

	/* zero bits 25 and above */
	info[3] &= 1;
	result[3] = 0;

	printd("Encoding: %s\n", osmo_hexdump(info, 4));

	/* encode */
	sch_encode(bursts_u, info);

	printd("U-Bits:\n");
	printd("%s\n", osmo_hexdump(bursts_u, 78));
	ubits2sbits(bursts_u, bursts_s, 78);
	printd("S-Bits:\n");
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s, 78));

	/* destroy */
	memset(bursts_s + 6, 0, 10);

	/* decode */
	sch_decode(result, bursts_s);

	printd("Decoded: %s\n", osmo_hexdump(result, 4));

	ASSERT_TRUE(!memcmp(info, result, 4));

	printd("\n");
}

uint8_t test_l2[][23] = {
	/* dummy frame */
      {	0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
	/* random frame */
      { 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
	0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
	0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8 },
	/* jolly frame */
      {	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
	0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
	0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};

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

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_xcch(test_l2[i]);

	for (i = 0; i < 256; i++) {
		test_rach(0x3f, i);
		test_rach(0x00, i);
		test_rach(0x1a, i);
	}

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_sch(test_l2[i]);

	printf("Success\n");

	return 0;
}