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External interrupt of stm32f4

2022-07-18 06:20:00 【Yiao】

Overview of external interrupts

stm32 Yes 22 External interrupts

EXTI Line 0~15： Corresponding to the outside IO The input of the port is interrupted .

EXTI Line 16： Connect to PVD Output .

EXTI Line 17： Connect to RTC Alarm clock event .

EXTI Line 18： Connect to USB OTG FS Wake Events .

EXTI Line 19： Wake up event connected to Ethernet .

EXTI Line 20： Connect to USB OTG HS( stay FS Middle configuration ) Wake Events .

EXTI Line 21： Connect to RTC Intrusion and timestamp Events .

EXTI Line 22： Connect to RTC Wake Events .

stm32f4 Each IO All ports can be used as the input of external interrupt , trunk 0 To 15 It can be used as IO Interrupt input of port , however IO There are more than 100 mouths , How will it be? IO Mouth and interrupt correspond one by one ？ The following figure gives the answer ：

Every break line , Same correspondence IO Serial number of port .

General configuration steps for external interrupts

① Can make SYSCFG The clock ： RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

② initialization IO The mouth is the input . GPIO_Init();

③ Set up IO Mapping relationship between port and interrupt line .void SYSCFG_EXTILineConfig(); Which one to use IO The port is mapped to which interrupt , If multiple interrupts are needed , Multiple mappings required .

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource0);//PA0  Connect to the interrupt line 0
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource2);//PE2  Connect to the interrupt line 2
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource3);//PE3  Connect to the interrupt line 3
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,EXTI_PinSource4);//PE4  Connect to the interrupt line 4

④ Initialize online interrupt , Set trigger conditions, etc .EXTI_Init();

	EXTI_InitTtt.EXTI_Line =（ Select the break line ）
                              EXTI_Line0/1/2/3/4/5...../22
	EXTI_InitTtt.EXTI_LineCmd=（ Choose whether to enable ）
                              DISABLE/ENABLE
	EXTI_InitTtt.EXTI_Mode=（ Select interrupt mode ）
                               EXTI_Mode_Interrupt/EXTI_Mode_Event
	EXTI_InitTtt.EXTI_Trigger=（ Select trigger mode ）
                               EXTI_Trigger_Rising
                               EXTI_Trigger_Falling
                               EXTI_Trigger_Rising_Falling// Trigger at any level 
	EXTI_Init(&EXTI_InitTtt);

⑤ Configure interrupt grouping （NVIC）, And can interrupt .NVIC_Init();

⑥ Write interrupt service function .EXTIx_IRQHandler();

⑦ Clears the interrupt flag bit EXTI_ClearITPendingBit();

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