STM32F4学习笔记之EXTI中断(使用固件库)

1.使能SYSSCFG和对应GPIO时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx,ENABLE);

2.配置对应GPIO为输入模式

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN;

GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_x;

GPIO_Init(GPIOx,&GPIO_InitStructure);

3.配置对应GPIO为EXIT线

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOx,EXTI_PinSourcex);

4.配置EXIT的工作参数

EXTI_InitStructure.EXTI_Line=EXTI_Linex;

EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;//中断，EXTI_Mode_Event为事件

EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;//下降沿，EXTI_Trigger_Rising为上升沿，EXTI_Trigger_Rising_Falling双跳边沿

EXTI_InitStructure.EXTI_LineCmd=ENABLE;

EXTI_Init(&EXTI_InitStructure);

5.配置NVIC中的EXTI中断线

NVIC_InitStructure.NVIC_IRQChannel=EXTIx_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=xx；

NVIC_InitStructure.NVIC_IRQChannelSubPriority=xx;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);

程序举例：

intmain(void)

{

GPIO_InitTypeDefGPIO_InitStructure;

EXTI_InitTypeDefEXTI_InitStructure;

NVIC_InitTypeDefNVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);

NVIC_Init(&NVIC_InitStructure);

GPIO_SetBits(GPIOF,GPIO_Pin_7|GPIO_Pin_9);

GPIO_SetBits(GPIOF,GPIO_Pin_8|GPIO_Pin_10);

while(1)

{

}

}

voidEXTI0_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line0)!=RESET)

{

/*ToggleLED1*/

GPIO_ResetBits(GPIOF,GPIO_Pin_8);

/*CleartheEXTIline0pendingbit*/

EXTI_ClearITPendingBit(EXTI_Line0);

}

}

voidEXTI9_5_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line5)!=RESET)

{

/*ToggleLED1*/

GPIO_SetBits(GPIOF,GPIO_Pin_8);

/*CleartheEXTIline0pendingbit*/

EXTI_ClearITPendingBit(EXTI_Line5);

}

}

voidEXTI15_10_IRQHandler(void)

{

if(EXTI_GetITStatus(EXTI_Line11)!=RESET)

{

/*ToggleLED2*/

GPIO_ResetBits(GPIOF,GPIO_Pin_7);

/*CleartheEXTIline0pendingbit*/

EXTI_ClearITPendingBit(EXTI_Line11);

}

if(EXTI_GetITStatus(EXTI_Line13)!=RESET)

{

/*ToggleLED2*/