Subject:
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Re: Bug in RCX 2.0 beta (Was: RIS 2.0 software now in beta)
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Newsgroups:
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lugnet.robotics.rcx, lugnet.robotics
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Date:
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Tue, 20 Mar 2001 21:01:31 GMT
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Viewed:
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4212 times
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Dear fellow Lego enthusiasts,
so far I did not receive any feedback to my problem report, neither from the
newsgroup, nor from Lego technical support. Could somebody please try to
confirm that I am not completely stupid in my analysis!
Regards,
Sebastian
--
Familie Wangick <familie.wangnick@t-online.de> schrieb in im Newsbeitrag:
G9opDv.B47@lugnet.com...
> Dear all,
>
> I have managed to pin down the problem a bit further. Please look at the
> following program:
>
> program foo {
> const c10 = 10
> main { forever {} }
> task test {
> local v2f
> local v2e
> local v2d
> v2f = 1
> v2e = 2
> v2d = v2e * c10
> }
> }
>
> If you download this script to the brick, and the upload it again, you • will
> receive the following:
>
> task,0,2,0,0x27,0x81
task,1,25,0,0x14,0x2f,0x02,0x01,0x00,0x14,0x2e,0x02,0x02,0x00,0x14,0x2f,0x00
> ,0x2e,0x00,0x54,0x2f,0x02,0x0a,0x00,0x14,0x2d,0x00,0x2f,0x00
>
> Task 1 (the task test) translates as following into LASM:
>
> task
> 1
> 25
> 0
> 0x14 setv 0x2f const 0x0001
> 0x2f
> 0x02
> 0x01
> 0x00
> 0x14 setv 0x2e const 0x0002
> 0x2e
> 0x02
> 0x02
> 0x00
> 0x14 setv 0x2f var 0x002e
> 0x2f
> 0x00
> 0x2e
> 0x00
> 0x54 mulv 0x2f const 0x000a
> 0x2f
> 0x02
> 0x0a
> 0x00
> 0x14 setv 0x2d var 0x002f
> 0x2d
> 0x00
> 0x2f
> 0x00
>
> As you can see the compiler translates the general multiplication v2d = • v2e
> * c10 into a setv tmp v2e, mulv tmp c10, setv v2d tmp sequence. When
> allocating the temporary local variable if fails to respect the • user-defined
> local variables, though -- it should have used the next free local • variable
> 0x2c for this operation!
>
> Hope this help fixing the problem.
>
> Regards,
> Sebastian
> --
> Dipl.-Inform. Sebastian Wangnick
>
> Familie Wangick <familie.wangnick@t-online.de> schrieb in im Newsbeitrag:
> G9oKJq.1y2@lugnet.com...
> > Dear all,
> >
> > I'm experiencing a strange phenomenon in my MindScript program which I
> > believe to be a bug, where within a task the assignment of a • multiplication
> > of a local variable (containing value 0) and a constant (set to 10) to a
> > second local variable would set a third local variable (containing 1) to
> > zero! If rewritten as a simple assignment and then a multiplying • assignment
> > the phenomenon disappears.
> >
> > Please find attached the script exemplifying the issue. It expects a • light
> > sensor on 1, a motor turning the light sensor on B and a touch sensor on • 2
> > being triggered when the motor turned the light sensor to 180° • resp. -180°.
> >
> > As a newbie to LEGO robotics (which both my son and me find fantastic) I
> > don't exclude that I overlooked some finesse of the RCX environment • though
> > ...
>
>
>
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