Can't get hardware interrupt working on Seeeduino Xiao

Hi there,
and welcome here, so the code tags , can be used here to make it look correct easier to read and others can compile it too.
</> paste it in there.
so I see this

#define SERVO_REVERSED false // Whether or not the servo channel is reversed

should this be a Boolean? maybe?
also typically the PIN is defined before the int is Attached.
you have it the other way around.?
my .02
HTH
GL :slight_smile: PJ
:v: