Re: How do I monitor the serial CTS line via C programmatically?
On 2003-01-16 15:44, Paul Hamilton <[EMAIL PROTECTED]> wrote: > Thanks Giorgos! > > I needed to know the function used to access the Serial ports under FreeBSD. > Your program compiles, but generates the following error msg when run: > > test_prog: ioctl: Inappropriate ioctl for device > > Thanks to the ioctl 'tip', I researched around, and found that the > serial port needed opening, so this is the finished code (just in > case someone else needs it): Ah, of course. When I tested it, I used: % ./a.out < /dev/cuaa1 so the shell did the open() for me :) You're right, of course... > [snip C source] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
RE: How do I monitor the serial CTS line via C programmatically?
Thanks Giorgos!
I needed to know the function used to access the Serial ports under FreeBSD.
Your program compiles, but generates the following error msg when run:
test_prog: ioctl: Inappropriate ioctl for device
Thanks to the ioctl 'tip', I researched around, and found that the serial
port needed opening, so this is the finished code (just in case someone else
needs it):
#include
#include
#include
#include /*Originally it was termio.h*/
#include
#include
int
main(void)
{
int bits;
int last;
int dcf_dev;
if((dcf_dev = open("/dev/cuaa1", O_RDWR|O_NOCTTY)) < 0)
{
perror("open /dev/cuaa0");
return (-1);
}
if (ioctl(dcf_dev, TIOCMGET, &bits) == -1)
err(1, "ioctl");
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
while (1) {
if (ioctl(dcf_dev, TIOCMGET, &bits) == -1)
err(1, "ioctl");
if ((last ^ (bits & TIOCM_CTS)) != 0) {
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
}
usleep(10);
}
return (0);
}
Brilliant!! :-)
Thanks for that!
Cheers,
Paul Hamilton
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Giorgos
Keramidas
Sent: Wednesday, 15 January 2003 7:21 PM
To: Paul Hamilton
Cc: [EMAIL PROTECTED]
Subject: Re: How do I monitor the serial CTS line via C
programmatically?
On 2003-01-15 18:26, [EMAIL PROTECTED] (Paul Hamilton) wrote:
> I have been trying to monitor the serial CTS line. I would like to
> log the fact that the CTS has changed state (active/non-active).
>
> I have been trying to adapt some Linux programs, but am having
> problems with adapting the POSIX TIOCMGET function.
>
> Is there a FreeBSD way?
You'd have to poll using ioctl(fd, TIOCMGET, &int) and detect CTS
changes by checking the TIOCM_CTS bit in the returned value. The
following (untested) sample program should be easy to adapt to your
needs. When TIOCM_CTS changes from on to off or vice versa, the
program should print the change.
#include
#include
#include
int
main(void)
{
int bits;
int last;
if (ioctl(0, TIOCMGET, &bits) == -1)
err(1, "ioctl");
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
while (1) {
if (ioctl(0, TIOCMGET, &bits) == -1)
err(1, "ioctl");
if ((last ^ (bits & TIOCM_CTS)) != 0) {
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
}
usleep(10);
}
return (0);
}
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Re: How do I monitor the serial CTS line via C programmatically?
On 2003-01-15 18:26, [EMAIL PROTECTED] (Paul Hamilton) wrote:
> I have been trying to monitor the serial CTS line. I would like to
> log the fact that the CTS has changed state (active/non-active).
>
> I have been trying to adapt some Linux programs, but am having
> problems with adapting the POSIX TIOCMGET function.
>
> Is there a FreeBSD way?
You'd have to poll using ioctl(fd, TIOCMGET, &int) and detect CTS
changes by checking the TIOCM_CTS bit in the returned value. The
following (untested) sample program should be easy to adapt to your
needs. When TIOCM_CTS changes from on to off or vice versa, the
program should print the change.
#include
#include
#include
int
main(void)
{
int bits;
int last;
if (ioctl(0, TIOCMGET, &bits) == -1)
err(1, "ioctl");
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
while (1) {
if (ioctl(0, TIOCMGET, &bits) == -1)
err(1, "ioctl");
if ((last ^ (bits & TIOCM_CTS)) != 0) {
last = bits & TIOCM_CTS;
printf("CTS %s.\n", last ? "on" : "off");
}
usleep(10);
}
return (0);
}
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How do I monitor the serial CTS line via C programmatically?
Hi, I have been trying to monitor the serial CTS line. I would like to log the fact that the CTS has changed state (active/non-active). I have been trying to adapt some Linux programs, but am having problems with adapting the POSIX TIOCMGET function. Is there a FreeBSD way? Cheers, Paul Hamilton To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
