Lpc2000

--- In lpc2000@yahoogroups.com, "Karl Olsen" <kro@p...> wrote:
> 
> --- In lpc2000@yahoogroups.com, vijayasarathy T <tvsarathy@g...> 
> wrote:
> > Hi,
> > 
> >      Iam using GNU arm gcc compiler for LPC2104 , when i use 
> >    
> >      while( !( SCB_PLLSTAT & PLL_LOCK ) );) 
> > 
> >       this statement, the assembly codes are not generated for other
> > instruction      below this statement. do any one have a suggestion.
> 
> Probably (SCB_PLLSTAT & PLL_LOCK) is always false, so the while loop 
> is infinite.  Code after an infinite loop would never be executed, so 
> GCC optimizes it away.

That would be my bet.  I expect that SCB_PLLSTAT and PLL_LOCK are
constants, intended to select a bit from a status word.  Just ANDing
them together produces a zero which is never true.  The OP needs to
read the status word and use these constants to select the bits for
the while condition.