Performing a loop every 10ms

[mackrackit]

When I was growing up and Mom said that she was getting a SWITCH...She was not referring to an electrical component

[skimask]

When I was growing up and Mom said that she was getting a SWITCH...She was not referring to an electrical component

Ya, mine too...it think it was an OKMU switch...One kid, multiple uses...for some reason, I begin to think that I was always the one that turned that switch on........and it seems like it never turned off!

[wasssup1990]

There you go people, my point has been backed up by these last few replies. I notice there are alot of assumptions being made.
E.g. 1 From skimask: "You wanted it handed to you on a platter so you could modify it and call it your own and impress your teachers or your buddies...whatever..."

Now that is some assumption. You jumped to that conclusion skimask, I know some other people on this form may do that, but all I needed was a somewhere to start. Go and look at my first post. See how innocent that looks? I guess the assumptions started right there. (:

E.g. 2 From mackrackit: "Whatever happened to people that want to learn.. Seems like all anyone wants these days is their problems solved for them with as little effort as possible on their part."
This person made the same assumption. What made you think I just wanted the answer straight up? It would have helped if someone could step me through how to set up Timer0.

Acetronics thought this was a cut and paste party. All I needed was some guidance.

Hmm I wonder what's going to be said next?

[skimask]

Hmm I wonder what's going to be said next?

Allow me.... ('cause most will )
Post #1 = +
Post #2 = +
and so on...
Post #15 = +
Post #16 = +
Post #17 = NEGATIVE - and it'll all downhill from there...thanks to...anyone...anyone...yep, you guessed it...

[Darrel Taylor]

It's suppoased to be a loop every 10ms.
Not an insult every 10 ms.

It's like a "Pack of Wolves".
And wasssup didn't start anything.

Y'all need to mellow out, and write some code.

Here's mine...

ReadingTaken VAR BIT
TRM0IF       VAR INTCON.2
TMR0IE       VAR INTCON.5
TimerReload  CON 60

OPTION_REG = %11010111   ; Assign Prescaler to TMR0, 1:256, internal clock
TMR0 = TimerReload       ; Load timer for first delay
TMR0IF = 0               ; Clear the interrupt flag
ReadingTaken = 0         ; indicate reading hasn't been taken yet

TMR0IE = 1               ; Enable TMR0 interrupt
ON INTERRUPT GOTO TakeReading

Main:
    If ReadingTaken then ; Wait for reading to be taken
        ReadingTaken = 0 ; Indicate the reading has been handled

        ; -- Reading has been taken, do something with it here --
    endif

GOTO Main

DISABLE
TakeReading:
    TMR0 = TimerReload   ; reload timer for next period
    TMR0IF = 0           ; Clear the interrupt flag

   ; -- this is called every ~10.036ms -- (with 20mhz OSC)
   ;    Take your reading

   ReadingTaken = 1      ; Tell main loop that a reading has been taken
RESUME
ENABLE

HTH,

[wasssup1990]

Thankyou Darrel
Admin has come to the rescue.

Thankyou for that usefull code. If I ever use any of it I will put credit to you in my source code and whoever else you think deserves credit for it.

I hope I never run into trouble like this again on this forum. I'm just a electronics and programming hobbiest needing a little programming help. I didn't need any of that rubbish above.

[Acetronics2]

MHhhhhh,

Thinking to it, Darrel is perfectly right ... ( as most of time ! )

We are here for programming pics tricks ... and Everything else is just "optionnal". May be this thought could avoid further fighting parties ...

Here are My two cents !

Alain

[sayzer]

It's suppoased to be a loop every 10ms.
Not an insult every 10 ms.

It's like a "Pack of Wolves".
And wasssup didn't start anything.

Y'all need to mellow out, and write some code.

Here's mine...

[code]ReadingTaken VAR BIT
TRM0IF VAR INTCON.2
TMR0IE VAR INTCON.5
TimerReload CON 60

....

Minor correction to DT's code above:
TRM0IF VAR INTCON.2 should be TMR0IF VAR INTCON.2

Also, I agree with DT. Here is my code thingie with my approach:

1.03mS interrupt at 4 MHz, 1:4 Prescaler Assigned to TMR0.
This works the opposite way of what DT does.
DT's code interrupts every 10mS, my code interrupts every 1mS.
Work on either one.

<font color="#008000">@ DEVICE PIC16F628A, INTRC_OSC_NOCLKOUT, WDT_OFF, PWRT_OFF, MCLR_OFF,PROTECT_ON,CPD_ON, BOD_OFF

</font>SetAll:
  <font color="#000080"><b>CLEAR
</b></font>TRISA = <font color="#FF0000"><b>%00000000       
</b></font>TRISB = <font color="#FF0000"><b>%00000000       
</b></font>CMCON = <font color="#FF0000"><b>7               
</b></font>VRCON.<font color="#FF0000"><b>7 </b></font>= <font color="#FF0000"><b>0
</b></font>VRCON.<font color="#FF0000"><b>6 </b></font>= <font color="#FF0000"><b>0

</b></font>PORTA = <font color="#FF0000"><b>0
</b></font>PORTB = <font color="#FF0000"><b>0

</b></font>TimeAdder <font color="#000080"><b>VAR BYTE

</b></font>OPTION_REG.<font color="#FF0000"><b>5 </b></font>= <font color="#FF0000"><b>0     </b></font><font color="#000080"><i>' TMR0 internal clk select bit.
</i></font>OPTION_REG.<font color="#FF0000"><b>3 </b></font>= <font color="#FF0000"><b>0     </b></font><font color="#000080"><i>' Prescaler Assigned to TMR0.
</i></font>OPTION_REG.<font color="#FF0000"><b>2 </b></font>= <font color="#FF0000"><b>0     </b></font><font color="#000080"><i>' Bit 2,1,0 : 1:4 prescaler.
</i></font>OPTION_REG.<font color="#FF0000"><b>1 </b></font>= <font color="#FF0000"><b>0 
</b></font>OPTION_REG.<font color="#FF0000"><b>0 </b></font>= <font color="#FF0000"><b>1

</b></font>T0IE <font color="#000080"><b>VAR </b></font>INTCON.<font color="#FF0000"><b>5  </b></font><font color="#000080"><i>'INTCON.5 = 1 ' Enable TMR0 interrupt.
</i></font>T0IF <font color="#000080"><b>VAR </b></font>INTCON.<font color="#FF0000"><b>2  </b></font><font color="#000080"><i>'INTCON.2 = 0 ' TMR0 interrupt overflow bit. Must be cleared in software.

</i></font>T0IF = <font color="#FF0000"><b>0           </b></font><font color="#000080"><i>' Cleared.
</i></font>T0IE = <font color="#FF0000"><b>1           </b></font><font color="#000080"><i>' Enable TMR0 interrupt.
</i><b>ON INTERRUPT GOTO </b></font>TMR0_Int

Begin: 
    <font color="#000080"><b>IF </b></font>TimeAdder = <font color="#FF0000"><b>10 </b></font><font color="#000080"><b>THEN </b><i>' We have 10mS cycle.
       </i></font>TimeAdder = <font color="#FF0000"><b>0       </b></font><font color="#000080"><i>' Clear time adder.
       'Do something here.
       '. 
       '..
       '...
    </i><b>ENDIF
    
    
    GOTO </b></font>Begin



<font color="#000080"><b>DISABLE
</b></font>TMR0_Int:       <font color="#000080"><i>'This routine is called every 1.03mS. Act Fast here.
    </i></font>TimeAdder = TimeAdder + <font color="#FF0000"><b>1
    </b></font>T0IF = <font color="#FF0000"><b>0  </b></font><font color="#000080"><i>' Clear interrupt flag bit.
    </i><b>RESUME                   
ENABLE     
    
    
</b></font>

[Darrel Taylor]

Minor correction to DT's code above:
TRM0IF VAR INTCON.2 should be TMR0IF VAR INTCON.2

WooHoo!, Somebody's paying attention. I love it!
Dang dyslexia.

Thanks Sayzer!
<br>

[sayzer]

WooHoo!, Somebody's paying attention. I love it!
Dang dyslexia.

Thanks Sayzer!
<br>

Attention is in my heart,
Reading and posting is never hard,
Let be friends, don't post assault,
Share the knowledge, you won't lose a byte.


P.S. - I am in finals going toward award.