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Full Discussion: unable to send read and write serial port
Top Forums Programming unable to send read and write serial port Post 302563310 by yashwantkumar on Tuesday 11th of October 2011 01:02:53 AM
Old 10-11-2011
i am using geomeda device .. and opening serail port, mapped in /dev/modem.
i have checked these "AT" commands from terminal.. thats works fine..
i have tested a basic code :-

Code:
int main(int argc,char** argv)
{
        struct termios tio;
        struct termios stdio;
        int tty_fd;
        fd_set rdset;
        unsigned char c='D';
        printf("Please start with %s /dev/ttyS1 (for example)\n",argv[0]);
        memset(&stdio,0,sizeof(stdio));
        stdio.c_iflag=0;
        stdio.c_oflag=0;
        stdio.c_cflag=0;
        stdio.c_lflag=0;
        stdio.c_cc[VMIN]=1;
        stdio.c_cc[VTIME]=0;
        tcsetattr(STDOUT_FILENO,TCSANOW,&stdio);
        tcsetattr(STDOUT_FILENO,TCSAFLUSH,&stdio);
        fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);       // make the reads non-blocking
 

        memset(&tio,0,sizeof(tio));
        tio.c_iflag=0;
        tio.c_oflag=0;
        tio.c_cflag=CS8|CREAD|CLOCAL;           // 8n1, see termios.h for more information
        tio.c_lflag=0;
        tio.c_cc[VMIN]=1;
        tio.c_cc[VTIME]=5;
        tty_fd=open(argv[1], O_RDWR | O_NONBLOCK);
        cfsetospeed(&tio,B115200);            // 115200 baud
        cfsetispeed(&tio,B115200);            // 115200 baud
        tcsetattr(tty_fd,TCSANOW,&tio);
        while (c!='q')
        {
                if (read(tty_fd,&c,1)>0)        write(STDOUT_FILENO,&c,1);              // if new data is available on the serial port, print it out
                if (read(STDIN_FILENO,&c,1)>0)  write(tty_fd,&c,1);                     // if new data is available on the console, send it to the serial port
        }
        close(tty_fd);
}

its working for stdout but if i try to pass "AT" commands using c var. .. its not working properly !
thanx for help !
Last edited by pludi; 10-11-2011 at 03:47 AM..
 

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LEARN ABOUT OPENSOLARIS

cfsetispeed

cfsetispeed(3C) 					   Standard C Library Functions 					   cfsetispeed(3C)

NAME

       cfsetispeed, cfsetospeed - set input and output baud rate

SYNOPSIS

       #include <termios.h>

       int cfsetispeed(struct termios *termios_p, speed_t speed);

       int cfsetospeed(struct termios *termios_p, speed_t speed);

DESCRIPTION

       The cfsetispeed() function sets the input baud rate stored in the structure pointed to by termios_p to speed.

       The cfsetospeed() function sets the output baud rate stored in the structure pointed to by termios_p to speed.

       There is no effect on the baud rates set in the hardware until a subsequent successful call to tcsetattr(3C) on the same termios structure.

RETURN VALUES

       Upon successful completion, cfsetispeed() and cfsetospeed() return 0. Otherwise -1 is returned, and errno may be set to indicate the error.

ERRORS

       The cfsetispeed() and cfsetospeed() functions may fail if:

       EINVAL	 The speed value is not a valid baud rate.

       EINVAL	 The value of speed is outside the range of possible speed values as specified in <termios.h>.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-------------------------------+
       |      ATTRIBUTE TYPE	     |	     ATTRIBUTE VALUE	     |
       +-----------------------------+-------------------------------+
       |Interface Stability	     |Standard			     |
       +-----------------------------+-------------------------------+
       |MT-Level		     |MT-Safe, and Async-Signal-Safe |
       +-----------------------------+-------------------------------+

SEE ALSO

       cfgetispeed(3C), tcsetattr(3C), attributes(5), standards(5), termio(7I)

SunOS 5.11							    24 Jul 2002 						   cfsetispeed(3C)
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