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List:       mandrake-confirme
Subject:    Re: [Confirme] =?iso-8859-15?q?acc=E8s=20port?= =?iso-8859-15?q?=20s=E9rie?=
From:       dt <daniel.tartavel () free ! fr>
Date:       2004-02-29 17:32:03
Message-ID: 200402291732.08625.daniel.tartavel () free ! fr
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Le Jeudi 19 Février 2004 20:11, cc a écrit :
> savez-vous comment accéder à un port série en lecture et écriture (en C
> ou en pascal de préférence) ?
> peut-on simplement utiliser le /dev/ttysn ?
> le but : envoyer une commande à un modem et récupérer le résultat.
si cela peut servir

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["init_modem.cpp" (text/x-c++src)]

/***************************************************************************
                          init_modem.cpp  -  description
                             -------------------
    begin                : mar jan 20 2004
    copyright            : (C) 2004 by DTux
    email                : DTux@free.fr
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
  #include <stdlib.h>
 #include <stdio.h>   /* Standard input/output definitions */
 #include <string.h>  /* String function definitions */
 #include <unistd.h>  /* UNIX standard function definitions */
 #include <fcntl.h>   /* File control definitions */
 #include <errno.h>   /* Error number definitions */
 #include <termios.h> /* POSIX terminal control definitions */
 #include <time.h>  //date and time
 #include <ctype.h>
 #include "olitec.h" /* classes declarations */

 char initstring[]={"AT&F&K3E0#CLS=8\r"};         //+VCID=1      &F&K3E0#CLS=8+FCLASS=0
 extern struct termios oldio;
 
 int open_port(void)
{
    int fd; /* File descriptor for the port */
    struct termios options;
    
    printf("opening modem port\n");
    fd = open("/dev/modem", O_RDWR | O_NOCTTY | O_NDELAY);   // | O_NDELAY);  // | O_SYNC);
    if (fd == -1)
    {
        // Could not open the port.
        perror("open_port: Unable to open /dev/modem - ");
    }
    else
    //fcntl(fd, F_SETFL, 0);


    // Get the current options for the port...


    tcgetattr(fd, &oldio);
    bzero(&options, sizeof(options));


    // * Set the baud rates to 115200...

    cfsetispeed(&options, B115200);
    cfsetospeed(&options, B115200);

    // set raw input, 1 second timeout
    options.c_cflag     |= (CS8 | CLOCAL | CREAD | CRTSCTS);  // | HUPCL);
    //options.c_cflag    &= ~(PARENB | PARODD | CSTOPB );
    options.c_iflag    = (IGNBRK | IGNPAR);   // | ISTRIP);
    options.c_lflag     = 0;   //ICANON ;           //| ECHO | ECHOE | ISIG);
    options.c_oflag     = 0;  //OPOST;
    options.c_cc[VMIN]  = 0;
    options.c_cc[VTIME] = 10;

    /*options.c_cc[VINTR]    = 0;     // Ctrl-c 
         options.c_cc[VQUIT]    = 0;     // Ctrl-\ 
         options.c_cc[VERASE]   = 0;     // del 
         options.c_cc[VKILL]    = 0;     // @ 
         options.c_cc[VEOF]     = 4;     // Ctrl-d 
         options.c_cc[VSWTC]    = 0;     // '\0' 
         options.c_cc[VSTART]   = 0;     // Ctrl-q 
         options.c_cc[VSTOP]    = 0;     // Ctrl-s 
         options.c_cc[VSUSP]    = 0;     // Ctrl-z 
         options.c_cc[VEOL]     = 0;     // '\0' 
         options.c_cc[VREPRINT] = 0;     //Ctrl-r 
         options.c_cc[VDISCARD] = 0;     // Ctrl-u 
         options.c_cc[VWERASE]  = 0;     // Ctrl-w 
         options.c_cc[VLNEXT]   = 0;     // Ctrl-v 
         options.c_cc[VEOL2]    = 0;     // '\0' 
          */
          tcflush(fd, TCIFLUSH);
    //  * Set the new options for the port...

     tcsetattr(fd, TCSANOW, &options);

    return (fd);
}

                 /* O - 0 = MODEM ok, -1 = MODEM bad */
int init_modem(int fd)   /* I - Serial port file */
    {
      unsigned char buffer[255];  /* Input buffer */
      unsigned char *bufptr;      /* Current char in buffer */
      int  nbytes;       /* Number of bytes read */
      int  tries;        /* Number of tries so far */
      int nb;
      int len;

      printf("Initializing modem\n");
      for (tries = 0; tries < 3; tries ++)
      {
              /* send an AT command followed by a CR */

            //if (write(fd, "ATZ\r",4) < 4)
              //  continue;

            //sleep(2);
            len=strlen(initstring);
            nb=write(fd, initstring, len);    //&FE0&K3B0
            if (nb==-1) continue;

            sleep(1);
            /* read characters into our string buffer until we get a CR or NL */
            bufptr = buffer;
            //fcntl(fd, F_SETFL, FNDELAY);
            nbytes = read_modem(fd, bufptr, 255);
            //nbytes=read(fd,bufptr,sizeof(buffer));
            //fcntl(fd, F_SETFL, 0);
            /* null terminate the string and see if we got an OK response */
            //*bufptr = '\0';
            //read(fd,buffer,255);
            printf("%d   %d  %s\n",nbytes,fd,buffer);
            if (strstr((char *)buffer, "OK") != 0) return (-1);
      }
      return (0);
}

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