Re: Is it normal for serial ports to drop characters at the end?

Dan Malek [off-list ref] writes:

Marcus Sundberg wrote:

quoted

Right on target.
rs_8xx_wait_until_sent() will wait for the *first* buffer descriptor
to be finished, instead of waiting for the last one as it should.
This patch fixes that problem:

That's part of it, but we also need to perform a graceful shutdown
of the port so we wait until the hardware FIFOs are empty.  Waiting
for the buffer descriptor just means the CPM moved the last data
from the buffer, not that it has gone out the wire.

Sure, but the above "works perfect for me(tm)", at least in 9600bps.

I thought I did this once.....but, why are you closing devices anyway :-).

I think I experienced this first when using the busybox init
implementation, which IIRC opens and closes /dev/console for each
message. Otherwise I've never seen it in a real application.

/Marcus
--
-------------------------------+-----------------------------------
        Marcus Sundberg        |       Phone: +46 707 452062
  Embedded Systems Consultant  |      Email: marcus@cendio.se
       Cendio Systems AB       |       http://www.cendio.com

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/