Help using termios

[goblin]

Hi all

I'm struggeling to get my serial port settings changed using termios.
I can change the baud rate fine, but none of the control flags respond
to my changes. As an example:

#include <stdio.h>
#Iinclude <termios.h>

int main (void) {
struct termios settings;
FILE* pPort;

if (!(pPort = fopen("/dev/ttyUSB0","r+")) ) {
printf("Oops0\n ");
return 1;
}

if (tcgetattr(file no(pPort), &settings) != 0) printf("Oops1\n ");
cfsetispeed(&se ttings, B9600);
cfsetospeed(&se ttings, B9600);
settings.c_ifla g |= CSTOPB;
if (tcsetattr(file no(pPort), TCSANOW, &settings) != 0)
printf("Oops2\n ");

fclose(pPort);
}

This will change the current baud rate to the selected 9600, but the
will not set two stop bits as I think it should. What am I doing wrong
here?

Any help would be sincerely appreciated.

Piet

[Pietro Cerutti]

Re: Help using termios

goblin wrote:

Hi all
>
I'm struggeling to get my serial port settings changed using termios.
I can change the baud rate fine, but none of the control flags respond
to my changes.

Termios is not part of the C standard, it's SUS2.

You will find more useful answers in comp.unix.progr ammer.

--
Pietro Cerutti

[goblin]

Re: Help using termios

Thank you for pointing me to the correct newsgroup. I have reposted
there.

http://groups.google.co.za/group/comp.unix.programmer/browse_thread/thread/a0cdf8e0a4bd205c#

[Antoninus Twink]

Re: Help using termios

On 22 May 2008 at 13:23, goblin wrote:

I'm struggeling to get my serial port settings changed using termios.
I can change the baud rate fine, but none of the control flags respond
to my changes.

[snip]

settings.c_ifla g |= CSTOPB;

You mean settings.c_cfla g (control settings, not input).