Subject:
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RE: SENSOR_READ doesn't return 0
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Newsgroups:
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lugnet.robotics.rcx.pbforth
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Date:
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Tue, 13 Apr 1999 02:07:31 GMT
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Viewed:
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1556 times
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> I have been experimenting with the latest version of pbFORTH (102)
AhA! Another victim within my clutches!!!!! Glad to hear you are trying
things out, John. The more questions I get, the sooner I can get a FAQ
out to help with the common ones.
> Which announces itself thus:
>
> hhii
>
>
> hForth H8/300 for RCX RAM Model V1.0.0 by Ralph Hempel, 1998
>
> All noncommercial and commercial uses are granted.
>
> Please send comments, bug reports and suggestions to:
>
> rhempel@bmts.com
That's a good sign, at least.
> I cannot get the LIGHT? word (tracker.txt) to work, it seems never to
> return 0, usually 200 or 300 (hex). I am initialising using:
>
> 1 CONSTANT RawLight
> 1 CONSTANT RunButton
> 3 CONSTANT MotorStop
You have obviously had some FORTH experience, I'll have to admit I haven't
fully tested the CONSTANT word...
> : BOT_INIT
>
> ." BOT_INIT" CR \
>
> RCX_INIT
> POWER_INIT
> BUTTON_INIT
> SENSOR_INIT
>
> RawLight SENSOR_ACTIVE
> 3 RawLight SENSOR_TYPE ( Light )
> 0 RawLight SENSOR_MODE ( Raw )
>
> ;
>
> What is the significance of a non-zero return by SENSOR_READ ?
This LOOKS ok, the non-zero return generally indicates BUSY, or not ready.
First off, does the script as presented work? In other words, does TRACKER.TXT
work on your RCX? If so, then I'd be looking at the CONSTANT word and making
sure it works properly too.
Please email me again if you have problems, and give me as much feedback as
you can, good or bad...
Cheers,
Ralph Hempel - P.Eng
--------------------------------------------------------
Check out pbFORTH for LEGO Mindstorms at:
<http://www.bmts.com/~rhempel/lego/pbFORTH/default.html>
--------------------------------------------------------
Reply to: rhempel at bmts dot com
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Message has 3 Replies:
 | | Re: SENSOR_READ doesn't return 0
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| (...) I am just dabbling at the moment, trying a few words to try and get them debugged. In order to fully port the SpeedBot (currently in NQC) I'll need multitasking... (...) Oh, good - I wondered if I'd got versions mixed up somewhere. It would be (...) (25 years ago, 13-Apr-99, to lugnet.robotics.rcx.pbforth)
| | | Re: SENSOR_READ doesn't return 0
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| More information: (...) CONSTANT is working - easy to check by doing RawLight . which prints 1 (...) This last line is the problem, if I use a SENSOR_MODE of 80 as in TRACKER.TXT then I get a SENSOR_READ of 0, if I use SENSOR_MODE 0 then I never get (...) (25 years ago, 13-Apr-99, to lugnet.robotics.rcx.pbforth)
| | | Re: SENSOR_READ doesn't return 0
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| ..and now I have the answer, after extensive grepping around Kekoa's disassembly and the pbFORTH .ASM files. SENSOR_READ should return only the bottom byte, the call to 0x14C0 only returns a byte so the high byte contains garbage (actually it seems (...) (25 years ago, 13-Apr-99, to lugnet.robotics.rcx.pbforth)
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Message is in Reply To:
| | SENSOR_READ doesn't return 0
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| I have been experimenting with the latest version of pbFORTH (102) Which announces itself thus: hhii hForth H8/300 for RCX RAM Model V1.0.0 by Ralph Hempel, 1998 All noncommercial and commercial uses are granted. Please send comments, bug reports (...) (25 years ago, 12-Apr-99, to lugnet.robotics.rcx.pbforth)
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