endiantest.c

来自「Omap5910 上实现双核通信 DSP GateWay」· C语言 代码 · 共 67 行

/*
 * dspapps/apps/ex_task/arm/endiantest.c
 *
 * ARM-side frontent program for DSP task endiantest
 *
 * Copyright (C) 2002-2005 Nokia Corporation
 *
 * Written by Toshihiro Kobayashi <[e-mail]>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * 2004/06/30:  DSP Gateway version 3.3
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

void usage(char *cmd) {
	fprintf(stderr, "%s <input long hex value>\n", cmd);
}

int main(int argc, char **argv) {
	int fd;
	unsigned long li, lo;
	char *devfn = "/dev/dsptask/endiantest";

	if (argc != 2) {
		usage(argv[0]);
		return 1;
	}

	li = strtoul(argv[1], NULL, 16);

	fd = open(devfn, O_RDWR);
	if (fd < 0) {
		fprintf(stderr, "cannot open %s\n", devfn);
		return 1;
	}

	if (write(fd, &li, 4) < 0) {
		perror("write failed");
		return 1;
	}
	if (read(fd, &lo, 4) < 0) {
		perror("read failed");
		return 1;
	}
	printf("input %08lx -> output %08lx\n", li, lo);
	close(fd);

	return 0;
}