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0,5s Timer

 
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thiaguetz



Joined: 03 Feb 2004
Posts: 12
Location: Brazil

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0,5s Timer
PostPosted: Sat Mar 12, 2005 7:11 pm     Reply with quote
Hi folks,

I would like to know if exist a way to improve the precision in the following code:

PS.: When my timer reach more than 6 secods, it begin floating some miliseconds.

Thanks!


Code:

#include <16f628.h>

#fuses INTRC,NOWDT,PUT,NOMCLR,NOPROTECT,NOCPD,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=19200, parity=N,xmit=PIN_B2,rcv=PIN_B1)

int8 counter;

#define TICK 7,62939453125

#INT_TIMER1
void clock_isr()
{
    if(--counter==0)
    {
      counter = TICK;
    }
}

void main()
{
   counter = TICK;
   setup_timer_1(T1_INTERNAL | T1_DIV_BY_1);
   set_timer1(0);
   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);

   while (true)
   {
   }
}
rwyoung



Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA

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PostPosted: Sat Mar 12, 2005 7:36 pm     Reply with quote
Go search the code archive posts. I believe it was Neutone (sorry if I'm giving credit where credit is not due) that posted some nifty stuff for zero-drift timing.
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Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month!
future



Joined: 14 May 2004
Posts: 330

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PostPosted: Sun Mar 13, 2005 12:09 am     Reply with quote
#define TICK 7,62939453125 is a float number.

int8 counter; // is an integer

counter = tick; // counter is 7 now

I think you must rethink what you are trying do achieve.
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