请教CORTEX M3/4的资源问题

当然有普通的IO中断。这个是其基本功能啊:上升沿,下降沿,双边沿

你可以查看datasheet中GPIOs章节的Interrupt Control:

The interrupt capabilities of each GPIO port are controlled by a set of seven registers. These registers

are used to select the source of the interrupt, its polarity, and the edge properties. When one or

more GPIO inputs cause an interrupt, a single interrupt output is sent to the interrupt controller for

the entire GPIO port. For edge-triggered interrupts, software must clear the interrupt to enable any

further interrupts. For a level-sensitive interrupt, the external source must hold the level constant

for the interrupt to be recognized by the controller.

那是你没看仔细？