Have you set GIE to 1 (global interrupt enable)?

/Ruben

> Device: PIC16F690.
> =

> I want to trigger an interrupt when the comparator on my PIC changes from
> OFF to ON. The +input of the comparator is connected to a divider which
> produces approximately 300mV. The -input is connected to a PAL video
> signal, the hope being that the comparator can act as a cheap sync
> separator.
> =

> So here is my initial code, in C, for the Hi-Tech C compiler:
> =

> /*
>  * Interrupt service routine.
>  *
>  * This is only triggered by the comparator input and it is here where we
>  * handle the video...
>  */
> interrupt isr()
> {
> 	PORTC =3D 0x01;
> 	PORTC =3D 0x00;
> clear_interrupt:
> 	// Clear interrupt flag and return.
> 	PIR2 &=3D ~CFG_C1IF;
> 	PIR2 &=3D ~CFG_C2IF;
> 	return;
> }
> =

> /*
>  * Main routine.
>  */
> int main()
> {
> 	// set up comparator
> 	VRCON  	=3D 0b00000000; 	// voltage ref: off
> 	// comparator enable, inverted polarity, + connected to external
> reference (pin 19), - to RA1 (pin 18.)
> 	CM1CON0 =3D CFG_C1ON | CFG_C1POL_INV | CFG_C1CH_0;
> 	// enable all peripheral interrupts
> 	INTCON  =3D CFG_PEIE;
> 	PIE2 	=3D CFG_C1IE | CFG_C2IE;
> 	TRISC 	=3D 0b00000000;	// tristate for C, all outputs.
> 	PORTC   =3D 0b00000000;	// output zero
> 	// Idle.
> 	while(1) ;
> }
> =

> PORTC never gets toggled. What is it that I am doing wrong?
> =

> Thanks.
> =

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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