On Mon, Dec 20, 2021 at 11:19:03AM +0100, Filip Žaludek wrote:
> Yes, you are right! Such gadget hardware is without hw flow control.
> I am using serial line only to capture console logs. I've tested
> both commands also with sw flow control ixon, ixoff with similar
> results.
The FTDI and PL2303 chips typically support automatic hardware flow
control, but you need to make sure the signals are wired up.
> Hopefully somebody sitting on scarce big iron with both usb port and
> serial port with proper hw flow control from this list gets
> attracted to kindly re-test.
No need to retest anything. Just enable hardware flow control otherwise
there cannot be any guarantees.
> Interesting part for me is that only serial to usb direction is
> failing..
But in this case, it looks like your test script is just broken. You
kill the consumer before it has read all the data:
uart_send__cat()
{
cat < "$1" > /tmp/d16 &
RX_PID=$!
cat /tmp/d16_0 > "$2"
stty sane # better results
kill $RX_PID
wait $RX_PID
uart_info "$3"
}
...
stty -F /dev/$SER 115200 raw -echo
stty -F /dev/$USB 115200 raw -echo
while true
do
uart_send__cat /dev/$SER /dev/$USB "u->s"
uart_send__cat /dev/$USB /dev/$SER "s->u"
done
Johan
