difference in timing

[sachin.kolkar]

hi guys,
i m facing problem with timer

 

[atferrari]

A good example of a ridiculous post!

 

[ericgibbs]

hi guys,
i m facing problem with timer

If it a boiled egg Timer, the sand has probably got damp..

 

[Pommie]

Unbelievable.

Mike.

 

[sachin.kolkar]

Unbelievable.

Mike.

i m sending my code

unsigned short counter,second,m;
 void main()
{
TRISB=0x00;
PORTB=0x0F;
T1CON=0b00001001;
TMR1H=0x80;
TMR1L=0x0F;
T1CON.TMR1ON=1;
PIR1.TMR1IF=0;
PIE1.TMR1IE=1;
INTCON=0xC0;
d0
{
 if(counter==30)
{
 counter=0;
second++;
if(second==60)
{
m++;
second=0;
if(m==1)
{
m=0;
PORTB=~PORTB;

}
}
}

}while(1);
}

void interrupt()
{
counter++;
TMR1H=0x80;
TMR1L=0x04;
PIR1.TMR1IF=0;
}

when i burn this programme to PIC16F72, first cycle it toggles at near 2mins,
for next cycles it exactly toggles at 1min...

is it tkes that extra time for boot up or what?
how can i overcome by this problem?
Plz help me .....

 

[Pommie]

That is because you don't initialise counter or seconds in your code. Try setting them to zero at the start of your main routine.

Mike.

 

[Norlin]

wow.amazed you were able to read that code format

 

[Pommie]

The lack of initialisation was fairly obvious. The really confusing thing is the D0 (zero) instead of DO and the spurious closing braces. I assume this was introduced while copying.

Mike.

 

[sachin.kolkar]

That is because you don't initialise counter or seconds in your code. Try setting them to zero at the start of your main routine.

Mike.

do you mean that making TMR1L=0x00; TMR1H=0x00; is initializing the counter right ..........
What do you mean by initialize the second?
PLZ send me some example code of initializing the second.

 

[sachin.kolkar]

That is because you don't initialise counter or seconds in your code. Try setting them to zero at the start of your main routine.

Mike.

do you mean that making TMR1L=0x00; TMR1H=0x00; is initializing the counter right ..........
What do you mean by initialize the second?
PLZ send me some example code of initializing the second.

 

[sachin.kolkar]

i m using 4.00MHz cystal........

 

[Pommie]

Just set them to zero,

unsigned short counter,second,m;
void main()
{
[COLOR="Blue"]    counter=0;
    second=0;[/COLOR]
    TRISB=0x00;
    PORTB=0x0F;
    T1CON=0b00001001;
    TMR1H=0x80;

You might also consider setting m=0 as well.

Mike.

 

[donniedj]

C on top of that!!!!!!!!!!

 

[sachin.kolkar]

Just set them to zero,

unsigned short counter,second,m;
void main()
{
[COLOR="Blue"]    counter=0;
    second=0;[/COLOR]
    TRISB=0x00;
    PORTB=0x0F;
    T1CON=0b00001001;
    TMR1H=0x80;

You might also consider setting m=0 as well.

Mike.

Thanx it working fine....