Lpc2000

rtstofer wrote:

>--- In lpc2000@yahoogroups.com, "Guillermo Prandi" 
><yahoo.messenger@m...> wrote:
>  
>
>>I wonder... what does this instruction aim for?:
>>
>>asm volatile ( "LDR LR, [LR, #+60]" );
>>
>>What is LR+60 pointing to? Why 60? Why not 56 or 64?
>>
>>Guille
>>
>>PS: Oh my God! I think I've been bumping my head against the desk 
>>    
>>
>all 
>  
>
>>day for the same exact problem!
>>
>>    
>>
>
>When I see that kind of code it makes me think of an execution stack 
>frame.  Find the way back to the previous frame by using an offset 
>to the current frame.
>
>Not that I am sure that is what is happening but that is what I have 
>seen done before where there are frames, notably in Pascal where 
>everything is linked.
>
>
>  
>
You're correct, it is the Link Register (stack).

TomW



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-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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