Help with C in linux Ubuntu 12.04 Post: 302659751

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Top Forums Programming Help with C in linux Ubuntu 12.04 Post 302659751 by Corona688 on Thursday 21st of June 2012 11:07:58 AM

06-21-2012

Registered User

You don't need C to put two statements in a text file:

Code:

# Create retrieve.sh
cat <<EOF >retrieve.sh
#!/bin/sh
echo "#o1" > /dev/ttyUSB1
cat /dev/ttyUSB1 > /home/hectormasencio/Desktop/text.txt
EOF
# Set it executable
chmod +x ./retrieve.sh
# Run it
./retrieve.sh

# You now have a file which retrieves data from your microcontroller when you run it.

But if you insist:

Code:

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(void)
{
        ssize_t ret;
        char buf[512];
        int fd=open("/dev/ttyUSB1", O_RDWR);
        if(fd < 0) return(1);

        write(fd, "#o1\n", 4);

        while( (ret=read(fd, buf, 512)) > 0)
                write(STDOUT_FILENO, buf, ret);

        close(fd);
        return(0);
}

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LEARN ABOUT XFREE86

write

WRITE(1)                                                    BSD General Commands Manual                                                   WRITE(1)

NAME

     write -- send a message to another user

SYNOPSIS

     write user [tty]

DESCRIPTION

     The write utility allows you to communicate with other users, by copying lines from your terminal to theirs.

     When you run the write command, the user you are writing to gets a message of the form:

           Message from yourname@yourhost on yourtty at hh:mm ...

     Any further lines you enter will be copied to the specified user's terminal.  If the other user wants to reply, they must run write as well.

     When you are done, type an end-of-file or interrupt character.  The other user will see the message 'EOF' indicating that the conversation is
     over.

     You can prevent people (other than the super-user) from writing to you with the mesg(1) command.

     If the user you want to write to is logged in on more than one terminal, you can specify which terminal to write to by specifying the termi-
     nal name as the second operand to the write command.  Alternatively, you can let write select one of the terminals - it will pick the one
     with the shortest idle time.  This is so that if the user is logged in at work and also dialed up from home, the message will go to the right
     place.

     The traditional protocol for writing to someone is that the string '-o', either at the end of a line or on a line by itself, means that it is
     the other person's turn to talk.  The string 'oo' means that the person believes the conversation to be over.

SEE ALSO

     mesg(1), talk(1), wall(1), who(1)

HISTORY

     A write command appeared in Version 1 AT&T UNIX.

BUGS

     The sender's LC_CTYPE setting is used to determine which characters are safe to write to a terminal, not the receiver's (which write has no
     way of knowing).

BSD                                                              February 13, 2012                                                             BSD