Bob Ammerman wrote:
> Careful use of dynamically allocated memory can make sense in an embedded 
> application. As examples, I will document the way dynamic memory is used in 
> three large embedded systems I have developed (one in assembler, one in C 
> and one in C++) that all use carefully managed dynamic memory allocation. It 
> is interesting to note that several techniques, as outlined below, can be 
> used to avoid the twin bugaboos of fragmentation and memory exhaustion. 
> Admittedly all of these systems have much more memory than a PIC.

Note that the three examples you cite do not use 'general' 
malloc/free-style dynamic memory. Did you use a compiler-provided 
(C-style) malloc at all? I understand that you certainly did not use free.

In all three cases you took explicit action to avoid fragmentation. 
Except for the double-pointer example approach one could argue that (in 
the other two) you don't use dynamic memory at all: you might as well 
have used one or more statically allocated arrays and hand out (and take 
back) array entries.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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