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 23:16:22 GMT
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Reply-To:
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robots@jpsc/nospam/.co.uk
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Viewed:
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1520 times
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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 to be
the high byte of the raw sensor word, which is why I was getting 0x300 and
0x200 returned). In raw mode SENSOR_RAW and SENSOR_VALUE return the same
thing.
For the moment I have recoded LIGHT? and it works:
: LIGHT? ( sensor -- value )
BEGIN
DUP SENSOR_READ
FF AND 0=
UNTIL
SENSOR_VALUE
;
I think SENSOR_READ read should end with:
MOV.B r6l,rTOSl ; Put result on top of stack
or whatever, I don't know this assembler. I guess the high byte should be
set to zero also.
--
John & James Cooper, Wallington, UK
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Message has 1 Reply:
 | | RE: SENSOR_READ doesn't return 0
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| (...) John, Thanks a lot for this catch. Sounds a lot like the email I exchanged with Kekoa regarding power down mode and external stacks, but that's another story... Cheers, Ralph Hempel - P.Eng ---...--- Check out pbFORTH for LEGO Mindstorms at: (...) (25 years ago, 15-Apr-99, to lugnet.robotics.rcx.pbforth)
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Message is in Reply To:
| | RE: SENSOR_READ doesn't return 0
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| (...) 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. (...) That's a good sign, at least. (...) You have obviously had (...) (25 years ago, 13-Apr-99, to lugnet.robotics.rcx.pbforth)
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