The Parallel port will have conected 2 to 3 (all depends) 4 to 16 bit
decoders/demultiplexers that will control 1 display at a time so there
will be up to 48 displays controled by the paralel port refreshe X times
per second, a raw test shown that it can be done but when other task
come the refresh time is degraded, Im trying to avoid the use of an
external microprocesor but that will be the last resource,
Rafael
Jay Wooten escribió:
Question, which may/may not affect what you are doing:
Are the 7 segments of the LED being turned on and left on, or are you
using PCM etc to refresh them X times per second?
Jay Wooten, President
Go Data Systems, Inc.
www.godatasystems.com
[EMAIL PROTECTED]
On Jul 17, 2006, at 10:59 AM, Rafael Vallejo wrote:
Hello List.
I'm developing an aplication that will be runign on an infinite loop
controling 7 segment display conected to a parallel port, in order
to make the cicle trough al the display as faster as posible I want
ot be shure what can be the best method based on the following
requeriments.
The aplication will show data on a Window, that data will be redrawn
every time it changes on it source that is not frecuently
The aplication will show that data also on the Displays conected to
the Parallel port.
What is faster read data from a text field on the main window or
have a copy of that on an array and read from there to display data
to the 7 segment Displays? nanoseconds here count, because a delay
can unhide the illusion of cilcing trough the displays
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