STM32 defines 20 external interrupts, all of which are triggered by edges and do not support level triggering. Among the 20 external interrupts, EXTI0--EXTI15 correspond to 16 groups of GPIO, as shown below
The processing function on EXTI0 is EXTI0_IRQHandler().
The processing function on EXTI1 is EXTI1_IRQHandler().
The processing function on EXTI2 is EXTI2_IRQHandler().
The processing function on EXTI3 is EXTI3_IRQHandler().
The processing function on EXTI4 is EXTI4_IRQHandler().
The processing function of EXTI5--EXTI9 is EXTI9_5_IRQHandler().
EXTI10--EXTI15's processing function is EXTI15_10_IRQHandler().
If the circuit design uses both PA0 and PB0 as interrupt input pins, then when the EXTI0 interrupt arrives, the software cannot determine whether the interrupt comes from PA0 or PB0, so an additional level detection circuit is required. From the perspective of design simplicity, the external interrupts should be staggered to prevent the problems mentioned above.
In addition to the 16 external interrupt lines mentioned above, there are 4 more external interrupt lines:
EXTI16------PVD output;
EXTI17------RTC Alarm event;
EXTI18------USB Wakeup event;
EXTI19------Ethernet Wakeup event; (only in interconnected devices)
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