Lpc2000

The overhead is very compiler dependant and the best way is to take a 
look at the list file generated by the compiler. Your simple loop may 
also be longer if there are any interrupts during the loop execution.

Richard.

dennis_arm wrote:

> Thank u Richard,
>
> I hope this works for me.
>
> but i am still left with my questions
> about the overhead due to the inlization and comparing ..
> in while and for loops..
> can u say something on this pls?
>
> regards,
> dennis
> --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
> >
> > Hi Dennis,
> >
> > I usually write short delays like this:
> >
> > void delay(unsigned int ticks)
> > {
> >   unsigned int start = Timer0_TC;
> >   while (Timer0_TC - start < ticks) { }
> > }
> >
> >
> > This does not use any match registers, you only need a timer that
> does
> > not reset its counter.
> >
> > Regards,
> > Richard.
> >
> >
> > dennis_arm wrote:
> >
> > > Hi All !!
> > > I am new to LPC2294 and wish to produce a small code for delay
> some
> > > thing like
> > >
> > > void delay (unsigned int Usec)
> > > {
> > >    unsigned int delayUsec= ( ?? ) * Usec;          // line 1
> > >    volatile unsigned int count = 0;                 // line 2
> > >    for (count = 0; count < delayUsec; count++)      //line 3
> > >              {asm volatile ("nop");}               // line 4
> > > }
> > > where time is the no of micro seconds
> > > for information I am using a 60MHz crystal on my board
> > >
> > > I know it is easy to do with timers 0 and 1 but i wish, NOT to use
> > > the timers at all as i need them for orther purpose.
> > > My question
> > > 1. is that is there any overhead added due to the code in the
> > > function for the lines 1,2,3,4 ?
> > > 2. is there any over head due to this "delay(/*some value*/)"
> being
> > > called in my over all code.?
> > >
> > >           If so how much delay? or where can i get the
> information?
> > >
> > > Am i missing some thing or is there a simple way to do this (to
> > > caliculate the delay with out using tmmers?)
> > >
> > >
> > > thanks in advance!!
> > >
> > > regards,
> > > dennis.
> > >
> > >
> > >
>
>
>
>
>
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