[Sdcc-user] RAM usage optimization

[Bernardo C. <bjc...@ya...>]

Hello.                                                                 
                                        
I've been using sdcc for a project implemented over a p89c51rd2, which 
                                        
has a total of 1KB in-circuit RAM. Since I've been using a lot of      
                                        
libraries and functions, mainly because I've got a few totally
different                                        
peripherals, then RAM usage grows up at high speed.                    
                                        
I've been compiling my code with:                                      
                                        
sdcc --code-size 65536 --iram-size 256 --xram-size 768 --model-large   
                                        
which I though was a good way, but now I would like to save some ram   
                                        
usage, 'cos my software is reaching the ram limit. I see that a lot of 
                                        
functions could use the same memory areas, but isn't using, surely 'cos
                                        
I dind't write, or compile, my code in the proper way.                 
                                        
So, basically, I was thinking of make some functions reentrant (which I
                                        
don't know if will be a solution), or make my libs overlay in some way 
                                        
(which I don't know how to do with --model-large), or (if no other     
                                        
option comes in place) define myself a memory map and hard-code the    
                                        
functions and variables to respect that map.                           
                                        
Well, you know, there is a lot of better programmers than me, and a few
                                        
of them come here in a regular basis, so I would better ask you
first...                                        
what do you think about my solutions? which one could be the best?, and
                                        
how it could be done?                                                  
                                        
                                                                       
                                        
Thanks In Advance                                                      
                                        
                                                                       
                                        
Saludos                                                                
                                        
                                                                       
                                        
    BJ                                                                 
                                        
Bernardo Clavijo                                                       
                                        
                                                                       
                                        
PS: forget my bad english... someday I'll learn to write in a readable 
                                        
way.


		
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