Subject:
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Re: Decoding the LEGO IR remote control
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 18 Sep 1999 04:14:53 GMT
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Viewed:
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1437 times
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Dennis,
Dave Baum just posted the remote control codes ... they are below:
- Nick -
Dave Baum wrote:
[snip]
> 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
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Message has 1 Reply:
 | | Re: Decoding the LEGO IR remote control
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| (...) Ah, so the infamous d2 opcode is finally fully explained. What the d2 opcode did was discovered a while back when the firmware was disassembled, but people could only guess as to why Lego put such an opcode into the RCX. It was never connected (...) (25 years ago, 18-Sep-99, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: Decoding the LEGO IR remote control
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| (...) [snip] (...) What makes this especially intrigueing is that the remote control box does not send messages with the same preamble as the RCX does. The RCX with take an RCX message and treat it as a message. The stuff from the remote is treated (...) (25 years ago, 17-Sep-99, to lugnet.robotics.rcx)
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