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thiaguetz
Joined: 03 Feb 2004
Posts: 12
Location: Brazil
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| 0,5s Timer |
 Posted: Sat Mar 12, 2005 7:11 pm |
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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)
{
}
} |
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rwyoung
Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA
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| Posted: Sat Mar 12, 2005 7:36 pm |
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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.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month! |
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future
Joined: 14 May 2004
Posts: 330
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| Posted: Sun Mar 13, 2005 12:09 am |
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#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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