I am using a joystick, and I have two pins sharing the same IRQ (i.e., IRQ13 for P0_15= LEFT_SWITCH & P0_9= DOWN_SWITCH). Note that I have set up both pins to use IRQ13, but the software complains if I instantiate two External interrupt blocks that point to the same IRQ channel (though the block itself does not turn red?). I was thinking I would need only one reference block, Let say for the Down Switch. If IRQ13 saw a falling edge, it would trigger regardless DOWN or LEFT switch is pressed. I could then sort out which was pressed in the interrupt. However, code is unresponsive to a left switch press. (Is it possible that P0_15 is something other than IRQ13 - I believe I found another mistake in the document regarding IRQs). I can however consistently poll on P0_15 (Left Switch), so I know it's not a hardware problem on my end.
