Lpc2000

hi Robert,
>>uart0 interrupt is enabled in startup.s section of
the code.
and i am setting the Pll configuration in main which
is executed later 

>>the REG defination is as below
#define REG(addr) (*(volatile unsigned long*)(addr))

>>SYS_xxxx ARE ADDRESS for the respective pll
registers

hope to get this thing running 

thanks 

shridhar
--- Robert Adsett
<subscriptions@...> wrote:
> At 07:31 PM 7/8/04 +0000, you wrote:
> >hi all,
> >i am trying to boost the PRocessor clock to near
> full speed by
> >setting the PLL registers
> >but PLL is not locking .
> >  am i making any mistake in configuring the PLL
> >here is my pll setting code
> >
> >void SetPLLtoMaxSpeed()
> >{
> >
> >
> >   // set PLL multiplier & divisor.
> >   // values computed from config.h
> >  REG(SYSCON_PLLCFG)= 0x23;                        
>  //where
> >         M=4,P=2, fosc=14.7456MHz,Fcclk=58.98MHz
> >  REG(SYSCON_PLLFEED) = 0xAA;
> >  REG(SYSCON_PLLFEED) = 0x55;
> 
> Some basic questions.
> 
> There are no interrupts enabled?
> What is the definition of REG (I am assuming that
> SYSCON... etc are simple 
> numeric constants)?
> 
> There is working code doing this in the newlib-lpc
> library (it goes so far 
> as to take in the oscillator frequency and desired
> operating frequency and 
> use them to calculate the required settings) 
>
http://www.aeolusdevelopment.com/Articles/download.html
> 
> That might be worth comparing to even if you don't
> use it.
> 
> Robert
> 
> " 'Freedom' has no meaning of itself.  There are
> always restrictions,
> be they legal, genetic, or physical.  If you don't
> believe me, try to
> chew a radio signal. "
> 
>                          Kelvin Throop, III
> 
> 



		
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