On Sun, Jul 07, 2013 at 07:00:19AM +0800, Electronic Consultation wrote:
> Then how can I reduce it if there interrupt without using decrement ?

Why would you not use decrement? What I said was that you cannot decrement
it because you set it as a constant. Once it's declared as a variable, you
can use decrement on it.

BAJ

> thanks
> On 7/07/2013 12:16 AM, Byron Jeff wrote:
> > On Sat, Jul 06, 2013 at 10:03:27PM +0800, Electronic Consultation wrote=
:
> >> after
> >> LedTimer RES 1
> >>
> >> How can I set it to 20 decimal ?
> > Exactly the same way you did it with COUNT:
> >
> > 	MOVLW	.20	; Note I normally change my default Radix to decimal
> > 	MOVWF	LedTimer
> >
> >> thanks
> >> On 6/07/2013 9:42 PM, Byron Jeff wrote:
> >>> On Sat, Jul 06, 2013 at 07:08:16PM +0800, Electronic Consultation wro=
te:
> >>>> Guys,
> >>>>
> >>>> I want to reduce LedTimer after interrupt but it returned to 20 agai=
n
> >>>> after interrupt,
> >>>> Do you have idea how handle it ?
> >>> The Equate (EQU) you have below fixes the value of LedTimer to 20. Si=
nce
> >>> you were moving it to COUNT, I figured you wanted a constant 20 count=
s to
> >>> count down in COUNT (which I do not see a definition for).
> >>>
> >>> Your code uses the RES directive to declare variables. If you want Le=
dTimer
> >>> to change, then it needs to be a variable too.
> >>>
> >>> BAJ
> >>>
> >>>> thanks
> >>>> [CODE]LedTimer EQU .20 ;10 decimal (for content of the counter to ge=
t 100ms)
> >>>>
> >>>>        led_state_1
> >>>>                    bcf     INTCON,T0IF             ;clear the interr=
upt flag
> >>>>                    bsf      PORTB, POWERLED         ;Turn on LED
> >>>>                movlw LedTimer
> >>>>                    movwf COUNT
> >>>>
> >>>>
> >>>>              ;counting
> >>>>
> >>>>             check_counter
> >>>>                            btfss INTCON,T0IF
> >>>>                goto  check_counter
> >>>>
> >>>>
> >>>>                         sublw .1
> >>>>                         btfss STATUS, Z        ;Is the result 0, cle=
ar COUNT
> >>>>
> >>>>
> >>>>               goto  check_counter     ;if false check the COUNTER ag=
ain
> >>>>                         goto  next_state        ;if true  go to this=
 statement
> >>>>
> >>>>
> >>>>
> >>>>            next_state
> >>>>                        clrf    COUNT             ;if false go to thi=
s
> >>>> statement
> >>>>                        incf    LedState,1            ; if 00 increas=
e the
> >>>> state, for the next state
> >>>>
> >>>>                        return[/CODE]
> >>>> --=20
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> >>>> View/change your membership options at
> >>>> http://mailman.mit.edu/mailman/listinfo/piclist
> >> --=20
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--=20
Byron A. Jeff
Chair: Department of Computer Science and Information Technology
College of Information and Mathematical Sciences
Clayton State University
http://faculty.clayton.edu/bjeff
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