thank you Tibi, already solved the problem !

top 10 wishes,
Vasile
http://surducan.netfirms.com


On Tue, 12 Aug 2003, tibi wrote:

> Vasile Surducan wrote:
>
> > Hi groups !
> >
> > I have spend a whole sunday trying to understand why interrupt of change
> > are not working for me. I have played with those on PIC16F877 and works
> > ok there.
> > According to DS41190A datasheet, using interrupt of change means:
> > In the main program:
> > - enabling all interrupts by setting gie
> > - enabling interrupts on change by setting gpie
> > - enabling pins individual interrupts on change by setting iocb0-iocb5
> >
> > In the interrupt routine:
> > - push-ing the status and w
> > - detecting gpif high state
> > - disabling gie
> > - writting the specific gpio to itself for mistmach condition
> > - calling the user isr routine
> > - clearing the gpif for the next interrupt sequence
> > - pop-ing the status_saved and w_saved
> > - retfie-ing ( gie is enabled)
> >
> > However, does not work. There is something I'm missing as new
> > (and unknown for me) 12F675 erata ?
> >
> > thank you in advance,
> > Vasile
> > http://surducan.netfirms.com
> >
> > --
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>
> HI Vasile
>
> Try this code from a PICkit  tutorial 3 downloaded from microchip web site
>
> ..
> .
> .
>
> ;****************************************************************************
>
> ;Initialization
> ;****************************************************************************
>
> Init
>  ;call    0x3FF      ; retrieve factory calibration value
>       ; comment instruction if using simulator, ICD2, or ICE2000
>  BANK1
>  movwf   OSCCAL      ; update register with factory cal value
>  call InitLED  ;Initialize LED Routine Variables
>  BANK0
>  clrf GPIO  ;Clear Port
>  BANK1
>
>  clrf ANSEL  ;PIC12F675 Only                       <<<<<<<<<<<<<<<<<<
>  movlw 0xFF
>  movwf TRISIO  ;Tri-State All Inputs
>  clrf VRCON  ;Vref Off
>  BANK0
>  movlw 0x07
>  movwf CMCON  ;Comparator Off
>  BANK1
>  movlw b'10000000'
>  movwf OPTION_REG ;TIMER0 Prescaler
>  bsf  IOCB,3  ;Interrupt on Pin Change For GP3
>  bsf  INTCON,GPIE ;Interrupt on Change Enabled
>  bsf  INTCON,T0IE ;Interrupt on TIMER0 Overflow Enabled
>  bcf  INTCON,T0IF ;Clear TIMER0 Overflow Interrupt Flag
>  bcf  INTCON,GPIF ;Clear Interrupt On Change Flag
>  bsf  INTCON,GIE ;Turn on Global Interrupts
>  BANK0
>  clrf TMR0
>
> etc
>
> regards Tibor
>
> --
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>

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