Subject:
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Re: Rotation sensor bug found
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 20 Apr 1999 19:13:22 GMT
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Viewed:
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1155 times
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Mario Ferrari <mario.ferrari@edis.it> wrote:
> I suppose we could ask for help also to non-legos owners of RCX and
> rotation sensors. What if any of us posts a message in the robotics
> newsgroup asking for some reads of rotation sensors? Raw values can be
> read with the sandard firmware too and then we will scale them. With a set
> of values a bit larger then mine we can probably set up legos constants to
> make them more general.
Why doesn't somebody finish up the decoding of the ROM, specifically the
routine at 14c0. This routine takes the raw sensor samples and converts
them to usable values, including handling the temperature and rotation
sensors. The standard firmware calls this function to do all its sensor
dirty work.
I never bothered with 14c0 because it was pretty clear (to me at least) how
to use it without going through it instruction by instruction.
Incidentally, I have a rotation sensor. According to my notes, the final
output of the sensor is an angle measured in units of 1/16ths of a
rotation, represented as a signed short. If you want to scale to something
standard, scale to that.
-Kekoa
P.S. All you late comers must see http://graphics.stanford.edu/~kekoa/rcx/
if you are at all interested in the low-level details of the RCX.
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Message has 2 Replies:
 | | Re: Rotation sensor bug found
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| (...) Excellent idea. This would yield the default settings dead-on. (...) Scaling isn't about the final output. The final output is already in the standard format. Scaling is about shifting the raw sensor values displayed by the firmware six digits (...) (25 years ago, 20-Apr-99, to lugnet.robotics.rcx.legos)
| | | Re: Rotation sensor bug found
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| (...) This seems the best approach to me too. My problem is I don't know if I am able to do such a thing :-) (...) I know your site and know you've done a LOT of hard work to understand and explain both RCX hardware and original firmware code. Mario (25 years ago, 21-Apr-99, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: Rotation sensor bug found
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| (...) I suppose we could ask for help also to non-legos owners of RCX and rotation sensors. What if any of us posts a message in the robotics newsgroup asking for some reads of rotation sensors? Raw values can be read with the sandard firmware too (...) (25 years ago, 20-Apr-99, to lugnet.robotics.rcx.legos)
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