Subject:
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Re: maximum number of variables in RCX2 ?
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Wed, 20 Feb 2002 09:23:56 GMT
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Viewed:
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3322 times
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Hi John,
In lugnet.robotics.rcx.nqc, John Guerquin writes:
> When using the RCX2 target, the NQC manual (Section 2.2.4) states that 32
> global variables, and 16 local variables (per task) are allowed. Does this
> mean that the whole program can only have 48 variables total when using only
> one task, ie. "main" , and several functions?
Yes ! Using more tasks you will get more local space (for each task 16). So
maximum number of variables is 32+(16*10) = 192
> The reason I ask this question, is that my understanding of local variables
> is that space is allocated only when the function has been called. Once the
> function is complete, the memory that was used to store those local
> variables is returned back to the ‘memory pool’.
That's how NQC is handling memory for local variables in functions,
subroutines, tasks. Local has a different meaning for RCX storage location
versus NQC. The firmware handels the memory in the task manner, but the NQC
compiler in the 'normal local variable' manner.
> If anyone could clarify
> the limitations of NQC variables, as well as how the limitations apply to
> arrays, I would greatly appreciate it.
Arrays are handled as normal variables having one name and an index. Array
size is limited to 32 when using it global (no global variable left !) and
16 if using it local. The size of the array must be fixed at compile time.
Hope that helps,
Rainer
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Message is in Reply To:
 | | maximum number of variables in RCX2 ?
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| When using the RCX2 target, the NQC manual (Section 2.2.4) states that 32 global variables, and 16 local variables (per task) are allowed. Does this mean that the whole program can only have 48 variables total when using only one task, ie. "main" , (...) (23 years ago, 20-Feb-02, to lugnet.robotics.rcx.nqc)
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