EXTI has two functions: one is to generate an interrupt, the purpose is to pass the input signal to NVIC, further run the interrupt service function, realize the function, at the software level; the other is to generate an event, the purpose is to generate a pulse signal for other peripherals to use, this is the circuit level signal transmission, at the hardware level. EXTI is mounted on the APB2 bus. EXTI0 to EXTI15 are used for GPIO, and EXTI16-EXTI22 are used for specific peripheral interrupt/event lines.
1. Initialize the GPIO that needs to be interrupted
2. Initialize EXTI to generate interrupts/events
Enable SYSCFG clock. To use GPIO external interrupt, you must enable SYSCFG clock.
Connect the EXTI interrupt source to the GPIO
Initialize the EXTI structure
1.EXTI interrupt/event line selection, EXTI_Line:EXTI_Line0 -EXTI_Line22 selection, but in the STM32 library function there is also External interrupt line 23 Connected to the LPTIM Wakeup event.
2.EXTI_Mode mode selection, choose to generate interrupt or generate event
3.EXTI_Trigger, select rising edge trigger or falling edge trigger
4.EXTI_LineCmd, whether to enable the EXTI line
Select EXTI interrupt source
3. Configure NVIC
Configuring NVIC Priority Groups
Configuring interrupt sources
Configuring preemption priority
Configure the priority of grabbing children
Enable interrupt channel
4. Write interrupt service function
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