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Hi Marco,
it is always interesting how many other people in the world do have the same
problems or are dealing with the same subject. Sometimes I had the feeling that
I dealt with "exotic" problems but then I realized that other "Mindstormers"
had similiar questions. But that is what this forum is for - right?
You wrote
> ...
> After this, I'll try to do standard VLL input with RCX2 firmware using
> FastTimer(). Because Standard VLL needs 10ms resolution, I think it'll work.
When you use "fast" timers, giving a resolution of 10 ms per tick, in most
cases you will not be able to create a certain time period exactly. E.g., if
you want to create a time period of 50 ms, you will get 50 ms + e, with
0 <= e < 10 ms. The reason for this is that you have to use a condition with
"FastTimer(n) >=" instead "FastTimer(n) ==".
Even when having a very simple loop like:
ClearTimer(0);
until (FastTimer(0) == 5) statement;
you will miss the exact condition very often. So you must use a ">=" instead of
a "==", producing the above tolerance "e".
> When I say VLL, I include the direct electrical connection, using the
> Off()/Float() technique, along with the other light emission through OUT
> ports or through active IN ports (example: using the LightSensor LED)
I wrote a VLL interface for the Microscout, adapting some technique of a
Japanese guy, that worked brilliant (besides the fact that the Microscout is a
really "stupid" unit). What I found out is that the transmission could not be
speeded up. The reason - as far asI think - is that the toggling of the light
sensor could not be made faster. Somewhere in Lugnet I read that the LED in the
light sensor is too slow but I don't believe this.
I will continue with tuning the interface. Currently - if I have the time - I
am experimenting with a bi-directional IR link between 2 RCXs with 3
requirements: asynchroneous, fast and totally reliable. Sounds simple - in fact
it is not, due to the fact that the IR unit in the RCX can either send or
receive.
Best regards
Bernd
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