Subject:
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Re: strange motor behaviour
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 2 Apr 2003 08:08:08 GMT
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Viewed:
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2582 times
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Tom Wouters wrote:
> well, the RCX only has 32Kbyte of memory of wich half is used by brickOs
> the remaining half should fit you user programm and all runtime stacks
(this should be your user programm of course)
> and heaps, so allocating 40*40*2Bytes(the minimum for a pointer in an
> 32Kbyte adresspace) will need 3.2Kb.
and i've been a bit too quick, it should be 40*40*1 (you're allocating
char's), still thats' about 1.5kByte, that is, 1/10th of the memory
available to you as user, so the following reasoning still holds i think...
> The RCX hasnt got any memory-protection either, therefor you can be
> writing over the adressess where the motors get there data about speed
> and direction..
> so i guess with that malloc you're actually overwriting brickos's own
> data...
Tom
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Message is in Reply To:
 | | Re: strange motor behaviour
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| (...) well, the RCX only has 32Kbyte of memory of wich half is used by brickOs the remaining half should fit you user programm and all runtime stacks and heaps, so allocating 40*40*2Bytes(the minimum for a pointer in an 32Kbyte adresspace) will need (...) (21 years ago, 2-Apr-03, to lugnet.robotics.rcx.legos)
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