[ts-7000] 7400 - Serial weirdness

["i_n_c_n_r_8" <>]

Hi there,

I have this issue with a little serial program I'm busy with. I have
the serial adaptor that comes with the devkit.
My program starts by receiving the serial data and after a random
period of time the 'read' function call returns '0' and keep on
returning zero, as if the serial interface goes in a weird state. When
I restart the program, the described process starts over.

Are they known issue I should be aware of?
Hers is a copy of the code (shamelessly copied from the net):
      #include <termios.h>
      #include <stdio.h>
      #include <unistd.h>
      #include <fcntl.h>
      #include <sys/signal.h>
      #include <sys/types.h>
        
      #define BAUDRATE B38400
      #define MODEMDEVICE "/dev/ttyS1"
      #define _POSIX_SOURCE 1 /* POSIX compliant source */
      #define FALSE 0
      #define TRUE 1
        
      volatile int STOP=FALSE; 
        
      void signal_handler_IO (int status);   /* definition of signal
handler */
      int wait_flag=TRUE;                    /* TRUE while no signal
received */
        
      main()
      {
        int fd,c, res;
        struct termios oldtio,newtio;
        struct sigaction saio;           /* definition of signal action */
        char buf[255];
        
        /* open the device to be non-blocking (read will return
immediatly) */
        fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK);
        if (fd <0) {perror(MODEMDEVICE); exit(-1); }
        
        /* install the signal handler before making the device
asynchronous */
        saio.sa_handler = signal_handler_IO;
        saio.sa_mask = 0;
        saio.sa_flags = 0;
        saio.sa_restorer = NULL;
        sigaction(SIGIO,&saio,NULL);
          
        /* allow the process to receive SIGIO */
        fcntl(fd, F_SETOWN, getpid());
        /* Make the file descriptor asynchronous (the manual page says
only 
           O_APPEND and O_NONBLOCK, will work with F_SETFL...) */
        fcntl(fd, F_SETFL, FASYNC);
        
        tcgetattr(fd,&oldtio); /* save current port settings */
        /* set new port settings for canonical input processing */
        newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
        newtio.c_iflag = IGNPAR | ICRNL;
        newtio.c_oflag = 0;
        newtio.c_lflag = ICANON;
        newtio.c_cc[VMIN]=1;
        newtio.c_cc[VTIME]=0;
        tcflush(fd, TCIFLUSH);
        tcsetattr(fd,TCSANOW,&newtio);
         
        /* loop while waiting for input. normally we would do something
           useful here */ 
        while (STOP==FALSE) {
          printf(".\n");usleep(100000);
          /* after receiving SIGIO, wait_flag = FALSE, input is available
             and can be read */
          if (wait_flag==FALSE) { 
            res = read(fd,buf,255);
            buf[res]=0;
            printf(":%s:%d\n", buf, res);
            if (res==1) STOP=TRUE; /* stop loop if only a CR was input */
            wait_flag = TRUE;      /* wait for new input */
          }
        }
        /* restore old port settings */
        tcsetattr(fd,TCSANOW,&oldtio);
      }
        
     
/***************************************************************************
      * signal handler. sets wait_flag to FALSE, to indicate above
loop that     *
      * characters have been received.                               
           *
     
***************************************************************************/
        
      void signal_handler_IO (int status)
      {
        printf("received SIGIO signal.\n");
        wait_flag = FALSE;
      }


------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/ts-7000/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/ts-7000/join
    (Yahoo! ID required)

<*> To change settings via email:
     
    

<*> To unsubscribe from this group, send an email to:
    

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/