Comment by kevin_thibedeau
Comment by kevin_thibedeau 16 hours ago
You should not use interrupts for button inputs. You will just end up hammering the processor with useless interrupts when the switch bounces. Human interfaces can be polled and still maintain responsiveness. If polling isn't fast enough for machine actuated IO or you need to stay in a low power state then interrupts could be considered but you really need a non-naive solution that disables the interrupt from within the handler for a specified timeout duration.
I've worked on several low power projects, while yes we needed an interrupt to wake the processor, they all still used polling for all the actual button handling. At worst the interrupt just set a flag. It's actually kind of amazing how polling turns the main loop into a denounce filter, entirely for free.