difference in timing - Electronic Circuits Projects Diagrams Free

sachin.kolkar · 20th April 2008, 11:24 AM

hi guys,
i m facing problem with timer

atferrari · 20th April 2008, 11:50 AM

A good example of a ridiculous post!

ericgibbs · 20th April 2008, 12:05 PM

Quote:

Originally Posted by sachin.kolkar

hi guys,
i m facing problem with timer

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

Pommie · 20th April 2008, 12:39 PM

Unbelievable.

Mike.

sachin.kolkar · 21st April 2008, 05:07 AM

Quote:

Originally Posted by Pommie

Unbelievable.

Mike.

i m sending my code

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 · 21st April 2008, 05:20 AM

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 · 21st April 2008, 05:45 AM

wow.amazed you were able to read that code format

Pommie · 21st April 2008, 06:30 AM

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 · 21st April 2008, 06:56 AM

Quote:

Originally Posted by 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.

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 · 21st April 2008, 07:02 AM

Quote:

Originally Posted by 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.

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 · 21st April 2008, 07:04 AM

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

Pommie · 21st April 2008, 07:58 AM

Just set them to zero,

Code:

unsigned short counter,second,m;
void main()
{
    counter=0;
    second=0;
    TRISB=0x00;
    PORTB=0x0F;
    T1CON=0b00001001;
    TMR1H=0x80;

You might also consider setting m=0 as well.

Mike.

donniedj · 22nd April 2008, 02:26 AM

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

sachin.kolkar · 23rd April 2008, 06:19 AM

Quote:

Originally Posted by Pommie

Just set them to zero,

Code:

unsigned short counter,second,m;
void main()
{
    counter=0;
    second=0;
    TRISB=0x00;
    PORTB=0x0F;
    T1CON=0b00001001;
    TMR1H=0x80;

You might also consider setting m=0 as well.

Mike.

Thanx it working fine....

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20th April 2008, 11:24 AM	(permalink)
sachin.kolkar	difference in timing hi guys, i m facing problem with timer __________________ hm:

20th April 2008, 11:50 AM	(permalink)
atferrari	A good example of a ridiculous post! __________________ Agustín Tomás In theory, there is no difference between theory and practice. In practice, however, there is.

20th April 2008, 12:39 PM	(permalink)
Pommie	Unbelievable. Mike.

21st April 2008, 05:20 AM	(permalink)
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.

21st April 2008, 05:45 AM	(permalink)
Norlin	wow.amazed you were able to read that code format

21st April 2008, 06:30 AM	(permalink)
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.

21st April 2008, 07:04 AM	(permalink)
sachin.kolkar	i m using 4.00MHz cystal........ __________________ hm:

21st April 2008, 07:58 AM	(permalink)
Pommie	Just set them to zero, Code: unsigned short counter,second,m; void main() { counter=0; second=0; TRISB=0x00; PORTB=0x0F; T1CON=0b00001001; TMR1H=0x80; You might also consider setting m=0 as well. Mike.

22nd April 2008, 02:26 AM	(permalink)
donniedj	C on top of that!!!!!!!!!!