24HJ128GP504 interrupt problem

[charliecoutas]

I have used this device (24HJ128GP504) a few times with great success. But I can't get INTERRUPT 1 to work.

I have this to assign PORTB.12 to INT1:-   PPS_Input(cIn_Pin_RP12, cIn_Fn_int1)   

INT1 is enabled and the edge to falling, pin PORTB.12 is TRISsed as input.

I can see pin PORTB.12 going up and down, but the interrupt is not triggering.

I have an LED flash trap at the start of the ISR, it's never running.

Any ideas of what I may have overlooked?

Charlie

[charliecoutas]

Found it. I had forgotten to set the priority for INT1. By default it's zero, which means it will never fire.

Charlie

[top204]

The interrupt priorities on the PIC24 and dsPIC33 devices have caught me out a few times in the past, so I now set them all to high and let the natural order of them dictate their priority.