Re: Newbie question: setting baudrate / managing FIFO.

[Andrei Warkentin <andreiw@motorola.com>]

On Wed, Feb 16, 2011 at 4:51 AM, Andrei Warkentin <andreiw@motorola.com> wrote:
> Hi,
>
> I looked about the archives, but maybe I skipped something... When I
> am handling set_termios, what assumptions can I make regarding the
> TX/RX state? I didn't take a look at all the serial drivers, but the
> ones I did look did not bother flushing FIFOs and ensuring nothing can
> be present in the TX FIFO while updating LCR and divisors. Should I do
> the equivalent of stop_tx inside set_termios? Is that already ensured?
> The hardware I am looking at needs to have FIFO cleared after setting
> baud rate, and I was getting concerned over potential data loss
> scenarios...
>
> Thanks,
> A
>

I realize there are different versions of the TCSET - TCSETS,
TCSETF... i.e. if you wanted to flush the buffer you'd ask for it. So
it should be ok to just clear the FIFO and destroy anything in them,
right? Or should I still flush the FIFOs after disabling flow control
if it was on? After all you could have gotten data after you called
set_termios.

Thanks,
A