microprocessor interrupts

Sam Vimes

i'm trying to use interrupts on a microprocessor. its not working and i have no idea why. its nothing to do with the hardware because it doesn't work in the MPLAB simulator using PIC C

the INTF interrupt works (RB0) but the RBIF one doesn't. anyone know why its not working? am i missing something?

#include <pic.h>

main(void)
{

	INTE = 1;
	RBIE=1;
	PEIE=1;
	GIE = 1;		

	for(;;);
}


static void interrupt isr(void)			
{
	NOP();
	if(INTF)
	{
		INTF=0;
	}
	if(RBIF) {				
		RBIF=0;
	}
}

themole

how do you know its not working?

You are checking a value and if true setting it to 0.

So either way at the end of the isr both INTF=0;RBIF=0; , regardless of which was originally set.

There is surely more to it than the code shown

Sam Vimes

themole wrote:

how do you know its not working?

You are checking a value and if true setting it to 0.

So either way at the end of the isr both INTF=0;RBIF=0; , regardless of which was originally set.

There is surely more to it than the code shown

mplab has a function for animating a program where an arrow moves to the line that's currently being executed. when i simulate it, the arrow goes into the infinite loop and just stays there.

i set up two buttons that trigger RB0 and RB1. when i click the RB0 button the arrow moves to the isr but when i click the RB1 button nothing happens

there was other code but i cut it down to that to test the isr


INTF is the RB0 interrupt flag and RBIF is the flag for the rest of portb. it has to be reset at the end of the interrupt service routine or it'll just loop

themole

Commander Vimes wrote:

i set up two buttons that trigger RB0 and RB1. when i click the RB0 button the arrow moves to the isr but when i click the RB1 button nothing happens

Are they both set up to trigger an interrupt?
Are you sure this is possbile?, some chips only allow interrupts to be triggered on certain lines.