Thread: using AT command set in C

Tell us which OS and Compiler you're using.

C can do this, but there is no standard answer you can simply plug in and use.

> it is for linux
The whole of linux's access to the outside world is through device drivers, and they can all be found within the "/dev" directory.

If I remember, the first serial port is accessed through "/dev/ttyS0"

So it might look something like this

Code:

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

int main ( ) {
    int fd;
    fd = open( "/dev/ttyS0", O_RDWR );
    if ( fd != -1 ) {
        char    *reset = "ATZ";
        int     n;
        n = write( fd, reset, strlen(reset) );
        if ( n == -1 ) {
            perror( "Write failed" );
        }
        close( fd );
    } else {
        perror( "Can't open serial port" );
    }
    return 0;
}

> i got bloodshed also but it sux cuz gaveme errors with my previous programs so im not gonna use it
Perhaps if you posted some code, we could tell you where the real problem lies.
Many people use it quite successfully.

devfs is deprecated in 2.6 kernels.

What are you trying to say with that link Codeplug? According to my 2.6.7 kernel, it says that devfs is "OBSOLETE". It says it has been replaced by udev:

Originally Posted by linux-2.6.7

Note that devfs has been obsoleted by udev,
<http://www.kernel.org/pub/linux/utils/kernel/hotplug/>.
It has been stripped down to a bare minimum and is only provided for
legacy installations that use its naming scheme which is
unfortunately different from the names normal Linux installations
use.