Re: [Ftdi-usb-sio-devel] [SOLVED] Baudrate setting is broken.

[Bill R. <bil...@gm...>]

Hi there,

The c_cflag settings don't set the baud rate.

They set other communications modes like stop bits, parity etc.

So you can't set the baudrate in c_cflag.

You've solved the problem yourself by calling the speed setting functions.

You should remove the baudr from your c_cflag setting also because you
might be settings things you don't want to accidentally.



Here's the posix documentation

http://pubs.opengroup.org/onlinepubs/7908799/xsh/termios.h.html

and the linux documentation

http://man7.org/linux/man-pages/man3/termios.3.html


Enjoy serial programming!

Bill


On Tue, Sep 30, 2014 at 4:58 AM, Teunis van Beelen <te...@gm...> wrote:
> Dear maintainers,
>
> It looks like I solved the problem.
>
> I was using this code to set the params for the serial port:
>
>   new_port_settings.c_cflag = baudr | cbits | cpar | bstop | CLOCAL | CREAD;
>   new_port_settings.c_iflag = IGNPAR;
>   new_port_settings.c_oflag = 0;
>   new_port_settings.c_lflag = 0;
>   new_port_settings.c_cc[VMIN] = 0;      /* block untill n bytes are received */
>   new_port_settings.c_cc[VTIME] = 0;     /* block untill a timer
> expires (n * 100 mSec.) */
>   cfsetispeed(&new_port_settings, baudr);
>   cfsetospeed(&new_port_settings, baudr);
>   error = tcsetattr(Cport[comport_number], TCSANOW, &new_port_settings);
>
> After adding the next two lines to my sourcecode, it works fine:
>
> cfsetispeed(&new_port_settings, baudr);
> cfsetospeed(&new_port_settings, baudr);
>
> So, this means that setting the baudrate with:
>
> new_port_settings.c_cflag = baudr | cbits | cpar | bstop | CLOCAL | CREAD;
>
> is not sufficient??
>
> (baudr is an int that contains the value B9600 or B19200, etc.)
>
> Sorry for bothering,
>
> Best Regards,
>
> Teunis van Beelen
>
>
> --
> "C'è qualcosa nella nebbia! Qualcosa nella nebbia ha preso John Lee!"
>
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