TMR0 Longer time

[HenrikOlsson]

Why not use the prescaler? That will make the timer tick slower.
Otherwise, just do it the way you're thinking, each time it overflows (indicated by the interrupflag) you increment a variable. When it reaches the desired value you do whatever.
Just remember to claer the interrupt flag, you have that commented out in the code.

/Henrik.

[camerart]

Why not use the prescaler? That will make the timer tick slower.
Otherwise, just do it the way you're thinking, each time it overflows (indicated by the interrupflag) you increment a variable. When it reaches the desired value you do whatever.
Just remember to claer the interrupt flag, you have that commented out in the code.

/Henrik.

Hi H,

I changed the prescaler bits:

T0CON.T0PS2 = 0 'Bit2 = 1:2 Prescale value
T0CON.T0PS1 = 0 'Bit1 = 1:2 Prescale value
T0CON.T0PS0 = 0 'Bit0 = 1:2 Prescale value

To:
T0CON.T0PS2 = 1 'Bit2 = 1:256 Prescale value
T0CON.T0PS1 = 1 'Bit1 = 1:256 Prescale value
T0CON.T0PS0 = 1 'Bit0 = 1:256 Prescale value

But I didn't see any difference.

You can see the commented out interrupt flag farther down the code.

Thanks C.

[HenrikOlsson]

Hi,
Now that doesn't make sense...
Which PIC are you using and what clock frequency?

I don't think I've seen the individual bitnames being predefined like that...which version of PBP are you using?

/Henrik.

[camerart]

Hi,
Now that doesn't make sense...
Which PIC are you using and what clock frequency?

I don't think I've seen the individual bitnames being predefined like that...which version of PBP are you using?

/Henrik.

Hi H,

I'm using an 18F2431 PIC in Oshonsoft simulator.

I just tried the 'time = time + 1' option, and also didn't get proper result, so perhaps I didn't get it correct!

Can you confirm that if those bits are correct and they are set to 1 which should make 1:265, instead of the previous 1:2. Should it now be slower?

C.

[HenrikOlsson]

Hi,
Yes, TMR0CON = %10001111 should be TMR0 enabled, prescaler assigned to it with ratio 1:256. If I where you I'd try it on real hardware, I'm willing to bet it's a simulator issue...

You do realise though that this forum is for MeLabs PBP compiler which is not the same as the Oshonsoft compiler, right? They're both BASIC, they're both for PIC but they are not the same.

/Henrik.

[camerart]

Hi,
Yes, TMR0CON = %10001111 should be TMR0 enabled, prescaler assigned to it with ratio 1:256. If I where you I'd try it on real hardware, I'm willing to bet it's a simulator issue...

You do realise though that this forum is for MeLabs PBP compiler which is not the same as the Oshonsoft compiler, right? They're both BASIC, they're both for PIC but they are not the same.

/Henrik.

Hi H,

I am using the simulator, then putting it on the hardware, as the simulator doesn't actually support what I am doing

I realise that this is not an Oshonsoft support forum, I have had good replies from this forum, also there isn't much on Oshonsoft.

Thanks, C.

[camerart]

Correction. The simulator doesn't support [I]fully[I] what I'm doing.