fastest approach?

From: Little.Horse (
Date: 04/12/05

Date: Tue, 12 Apr 2005 11:16:28 +0800


We have a requirement to read data from serial port ( ie RS232 ) , then do
some simple calculation and finally write to io port ( ie LCD driver ).
Since time is critical or very limited, we are wondering there have any good
approach for this. As such, I need you input about what I thought:

(1) Change the Serial Port Driver a little bit
(2) When message received, then do some calculation and write to IO port.

Is above approach faster than write a program in user mode to read RS232 and
then write to IO port?

Any idea? Thanks in Advance,