Subject:
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Re: What I would do (2)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 27 Jan 2006 19:57:10 GMT
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Viewed:
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1870 times
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In lugnet.robotics, Alexander Sack wrote:
>
> I'm not so sure about this. Figure its an ARM7 clocked way below 50Mhz (for
> power) and has 64k of memory. How much runtime state can you really process
> with 64k after the kernel and sensor/motor processes are loaded?
The processor speed (even underclocked) will not be an issue.
There real issue which I see many people have talked about is the amount of
memory will be in the NXT.
On the website for uCOS-II there is a RAM calculation (for the Intel 80x86
architecture) indicating the total amount of RAM required for the kernel. The
full kernel using argument checking on the Intel processor is 20.5k or about a
third of the 64k memory. I can't remember what percentage of total memory
legOS/brickOS took within the RCX. There should be enough remaining to hold
most user applications.
As a point of reference the Apollo Guidiance Computer had only 36,000 15-bit
words or 72k memory space. [See
http://ed-thelen.org/comp-hist/TheCompMusRep/TCMR-V02.html].
Ed
[A lunar rover. MMmmm. Now there is an idea for a robot. And the NXT color
scheme would be right. Bright yellow (RCX) just does not seem right for a luner
rover]
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Message has 1 Reply:
 | | Re: What I would do (2)
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| (...) Didn't say it was! :-)! (...) Bingo! (...) I'm running it now and its quite a nice little OS. Like we both said, the real work is just asking tasks to manage the specific resources of the NXT. (...) Again, totally agree (as I stated in my last (...) (18 years ago, 27-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: What I would do (2)
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| (...) power) and has 64k of memory. How much runtime state can you really process with 64k after the kernel and sensor/motor processes are loaded? Maybe more than I think... Btw, thanks for the document! The current paradigm in RTOS design seems to (...) (18 years ago, 27-Jan-06, to lugnet.robotics)
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