raw_listen.c

传感器网络中的嵌入式操作系统源代码

// $Id: raw_listen.c,v 1.1.14.5 2003/09/02 18:03:33 idgay Exp $

/*									tab:4
 * "Copyright (c) 2000-2003 The Regents of the University  of California.  
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define BAUDRATE B19200 //the baudrate that the device is talking
#define SERIAL_DEVICE "/dev/ttyS0" //the port to use.

int input_stream;

void print_usage(char *name);
void open_input(int argc, char **argv);

int main(int argc, char ** argv) {
    if (argc > 3 || argc > 1 && argv[1][0] == '-') {
	print_usage(argv[0]);
	exit(2);
    }
    open_input(argc, argv);
    while(1) { 
	unsigned char c;
	int cnt = read(input_stream, &c, 1);

	if (cnt < 0) {
	    perror("error reading from serial port");
	    exit(2);
	}
	if (cnt == 1) {
	    if (c == 0x7e) printf("\n");
	    printf("%02x ", c);
	}
    }
}

void print_usage(char *name){
    //usage...
    fprintf(stderr, "usage: %s [serial port] [baudrate]\n", name);
    fprintf(stderr, "Default serial port is " SERIAL_DEVICE ", default baud rate is 19200\n");
}


void open_input(int argc, char **argv) {
    /* open input_stream for read/write */ 
    struct termios newtio;
    const char *name = SERIAL_DEVICE;
    unsigned long baudrate = BAUDRATE;

    if (argc > 1)
	name = argv[1];
    if (argc > 2) {
	int reqrate = atoi(argv[2]);

	switch (reqrate) {
#ifdef B50
	case 50: baudrate = B50; break;
#endif
#ifdef B75
	case 75: baudrate = B75; break;
#endif
#ifdef B110
	case 110: baudrate = B110; break;
#endif
#ifdef B134
	case 134: baudrate = B134; break;
#endif
#ifdef B150
	case 150: baudrate = B150; break;
#endif
#ifdef B200
	case 200: baudrate = B200; break;
#endif
#ifdef B300
	case 300: baudrate = B300; break;
#endif
#ifdef B600
	case 600: baudrate = B600; break;
#endif
#ifdef B1200
	case 1200: baudrate = B1200; break;
#endif
#ifdef B1800
	case 1800: baudrate = B1800; break;
#endif
#ifdef B2400
	case 2400: baudrate = B2400; break;
#endif
#ifdef B4800
	case 4800: baudrate = B4800; break;
#endif
#ifdef B9600
	case 9600: baudrate = B9600; break;
#endif
#ifdef B19200
	case 19200: baudrate = B19200; break;
#endif
#ifdef B38400
	case 38400: baudrate = B38400; break;
#endif
#ifdef B57600
	case 57600: baudrate = B57600; break;
#endif
#ifdef B115200
	case 115200: baudrate = B115200; break;
#endif
#ifdef B230400
	case 230400: baudrate = B230400; break;
#endif
#ifdef B460800
	case 460800: baudrate = B460800; break;
#endif
#ifdef B500000
	case 500000: baudrate = B500000; break;
#endif
#ifdef B576000
	case 576000: baudrate = B576000; break;
#endif
#ifdef B921600
	case 921600: baudrate = B921600; break;
#endif
#ifdef B1000000
	case 1000000: baudrate = B1000000; break;
#endif
#ifdef B1152000
	case 1152000: baudrate = B1152000; break;
#endif
#ifdef B1500000
	case 1500000: baudrate = B1500000; break;
#endif
#ifdef B2000000
	case 2000000: baudrate = B2000000; break;
#endif
#ifdef B2500000
	case 2500000: baudrate = B2500000; break;
#endif
#ifdef B3000000
	case 3000000: baudrate = B3000000; break;
#endif
#ifdef B3500000
	case 3500000: baudrate = B3500000; break;
#endif
#ifdef B4000000
	case 4000000: baudrate = B4000000; break;
#endif
	default:
	    fprintf(stderr, "Unknown baudrate %s, defaulting to 19200\n",
		    argv[2]);
	}
    }
    
    input_stream = open(name, O_RDWR|O_NOCTTY);
    if (input_stream == -1) {
	fprintf(stderr, "Failed to open %s", name);
	perror("");
	fprintf(stderr, "Make sure the user has permission to open device.\n");
	exit(2);
    }
    printf("%s input_stream opened\n", name);

    /* Serial port setting */
    bzero(&newtio, sizeof(newtio));
    newtio.c_cflag = baudrate | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR | ICRNL;

    /* Raw output_file */
    newtio.c_oflag = 0;
    tcflush(input_stream, TCIFLUSH);
    tcsetattr(input_stream, TCSANOW, &newtio);
}