William Chops Westfield wrote:

>On Dec 7, 2005, at 12:24 AM, Stephen D. Barnes wrote:
>
>  
>
>>If an embedded main() never terminates,
>>why is the software reset occurring?
>>    
>>
>
>A C compiler inserts code in your program that does initialization
>(the "crt0" that someone mentioned), calls main() as a function with
>the appropriate arguments (if any), and then cleans up.  In this case,
>"cleaning up" apparently means executing a software reset instruction,
>which is not at all a bad idea (if your processor HAS a reset 
>instruction!)
>
>You should be able to see this by disassembling the code...
>
>
>  
>
>>how do I keep the "main program loop" running.
>>    
>>
>
>It depends on what you want it to do.  Most embedded programs will
>have a natural loop that just never happens to exit.  You can
>add one artificially if you want:
>
>     main() {
>         while (1) {
>             /*
>              * lots of code
>              */
>         }
>     }
>
>Or you can define a routine or loop at the end of your program
>that does something specific OTHER than randomness:
>
>    main() {
>        /*
>         * Lots of code
>         */
>        while (1);     /* Done; sit in tight loop forever */
>    }
>
>BillW
>  
>
Now I understand! Thanks. Can you clarifiy what you mean by "Most 
embedded programs will have a natural loop that just never happens to exit"?

-- 
Regards,
Stephen D. Barnes

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