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

[Teunis v. B. <te...@gm...>]

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

Thanks Bill, I'll do that.
Much appreciated.

Best Regards

Teunis van Beelen



On Tue, Sep 30, 2014 at 7:02 AM, Bill Ryder <bil...@gm...> wrote:
> 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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"C'è qualcosa nella nebbia! Qualcosa nella nebbia ha preso John Lee!"