Subject:
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Re: legOS ... really a stack question
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 2 Jan 1999 23:01:39 GMT
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Viewed:
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1333 times
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Ben Laurie <lego-robotics@crynwr.com> wrote:
> Hmmm ... good point. 0xf000 is memory mapped I/O for the motors, IIRC.
> Not sure whats above there, but I wouldn't be surprised to hear it isn't
> a good place to store things. I'd guess that setting the stack to 0xeffe
> should be equally good.
All off-chip accesses to f000 or higher are memory mapped to the motors.
Because accesses to addresses above fb7f are all on-chip or invalid, the
motors are effectively memory mapped to f000-fb7f.
> I'll have to see if that also cures my mysterious problems...
What are your symptoms again?
One problem I noticed with LegOS is that it does not zero the .bss
section, which I believe contains uninitialized global data.
-Kekoa
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Message has 2 Replies:
 | | Re: legOS ... really a stack question
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| (...) Changing globals to statics causes crashes. Cheers, Ben. -- "My grandfather once told me that there are two kinds of people: those who work and those who take the credit. He told me to try to be in the first group; there was less competition (...) (25 years ago, 3-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: legOS ... really a stack question
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| (...) Hmmm ... good point. 0xf000 is memory mapped I/O for the motors, IIRC. Not sure whats above there, but I wouldn't be surprised to hear it isn't a good place to store things. I'd guess that setting the stack to 0xeffe should be equally good. (...) (25 years ago, 2-Jan-99, to lugnet.robotics)
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