Subject:
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Re: Tasks vs. program slots
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Sat, 18 Sep 1999 03:45:37 GMT
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Viewed:
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2157 times
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In article <slrn7u5l8e.245.mattdm@jadzia.bu.edu>, mattdm@mattdm.org wrote:
> Dave Baum <dbaum@spambgoneenteract.com> wrote:
> > There is no known programmatic way of transferring control from one
> > program to another.
>
> This is why it might be nice to get the remote control reverse engineered --
> we may discover a way.
The remote control always sends the same sort of packet:
d2 xx yy
where xxyy is a sixteen bit bit-field indicating what features should be
activated:
xxyy
0001 Message 1
0002 Message 2
0004 Message 3
0008 Motor A Forward
0010 Motor B Forward
0020 Motor C Forward
0040 Motor A Backward
0080 Motor B Backward
0100 Motor C Backward
0200 Run Program 1
0400 Run Program 2
0800 Run Program 3
1000 Run Program 4
2000 Run Program 5
4000 Stop Program
8000 Beep
These can be ORed together. I don't know if all combinations are legal,
but you can certainly combine the motor options together.
The remote sends multiple copies of the packet while the button is held
down, then sends a d20000 when the button is released.
Unfortunately, I think these codes are ignored when encountered within a
program. I tried the one to run program 5 from within an NQC program:
asm { 0xd2, 0x20, 0x00 };
It had no effect.
Dave Baum
--
reply to: dbaum at enteract dot com
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Message has 2 Replies:
 | | Re: Tasks vs. program slots
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| Hello Dave, First, let me thank you for NQC ... you've made my RCX playing tremendously more rewarding. I've been wanting to use a Sharp IR receiver to demodulate the signal from a LEGO remote control, and then a PIC to decode the rx output for use (...) (25 years ago, 18-Sep-99, to lugnet.robotics.rcx.nqc)
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