Lpc2000

Perfect.

Thank you.

--- In lpc2000@yahoogroups.com, Jack Key <jockey1111111@...> wrote:
>
> The formula is:
>    
>   peripheral_frequency=oscillator_frequency*pll_multiplier(if pll 
is enabled)/vpb_dividor
>    
>   So if your oscillator_frequency is 12MHz, pll_multiplier is 5 
and vpb_dividor is 4, the peripheral_frequency would be 15MHz. So 
for 10msec, the count would be:
>    
>   Count = peripheral_frequency * time_required
>            =   15,000,000 * .01
>            =   150,000
>    
>   So the count to be loaded in T0MR0 is 150000.
> 
> teddyroskvist <thr@...> wrote:
>   How do i calculate the time?
> I have the example you can see herunder.
> 
> In the interrupt routine the TOMR0 is set to 149999 because it 
> should be 10mSec.
> 
> But how do i calculate the number? if i need a another time.
> 
> -------------------------------------------------------------------
> 
> void tc0 (void) __irq  
> {
>   T0MR0 = 149999;                // 10mSec = 150.000-1 counts
>   T0IR        = 1;               // Clear interrupt flag
>   VICVectAddr = 0;               // Acknowledge Interrupt
> 
>       if ((IO1SET & 0xff000000) == 0xFF000000)
>             IO1CLR = 0xFF000000;
>       else
>             IO1SET = 0xFF000000;      
> }
> 
> /* Setup the Timer Counter 0 Interrupt */
> void init_timer (void) 
> {
>   T0MR0 = 149999;                   // 10mSec = 150.000-1 counts
> 
>   T0MCR = 3;                        // Interrupt and Reset on MR0
>   T0TCR = 1;                        // Timer0 Enable
>   VICVectAddr0 = (unsigned long)tc0;// set interrupt vector in 0
>   VICVectCntl0 = 0x20 | 4;          // use it for Timer 0 Interrupt
>   VICIntEnable = 0x00000010;        // Enable Timer0 Interrupt
> }
> 
> int main (void)  
> {
>       unsigned int i;
>       IO1DIR = 0xFFff0000;
>       init_timer();
>       while(1) 
>       {
>             IO1SET = 0x00FFffff;      
>             for (i = 0 ; i < 1000000 ; i++ ){}            
>             IO1CLR = 0x00FFffff;      
>             for (i = 0 ; i < 1000000 ; i++ ){}            
>       };
>       return 0;
> }
> 
> 
> 
> 
> 
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