STM32中断例子

/**
 *	External interrupts example
 *
 *	@author 	Tilen Majerle
 *	@email		[email protected]
 *	@website	http://stm32f4-discovery.net
 *	@ide		Keil uVision 5
 */
#include "stm32f4xx.h"
#include "stm32f4xx_exti.h"
#include "stm32f4xx_syscfg.h"
#include "misc.h"

/* Configure pins to be interrupts */
void Configure_PD0(void) {
	/* Set variables used */
	GPIO_InitTypeDef GPIO_InitStruct;
	EXTI_InitTypeDef EXTI_InitStruct;
	NVIC_InitTypeDef NVIC_InitStruct;
	
	/* Enable clock for GPIOD */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
	/* Enable clock for SYSCFG */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
	
	/* Set pin as input */
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_Init(GPIOD, &GPIO_InitStruct);
	
	/* Tell system that you will use PD0 for EXTI_Line0 */
	SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource0);
	
	/* PD0 is connected to EXTI_Line0 */
	EXTI_InitStruct.EXTI_Line = EXTI_Line0;
	/* Enable interrupt */
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	/* Interrupt mode */
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	/* Triggers on rising and falling edge */
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	/* Add to EXTI */
	EXTI_Init(&EXTI_InitStruct);

	/* Add IRQ vector to NVIC */
	/* PD0 is connected to EXTI_Line0, which has EXTI0_IRQn vector */
	NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
	/* Set priority */
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
	/* Set sub priority */
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
	/* Enable interrupt */
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
	/* Add to NVIC */
	NVIC_Init(&NVIC_InitStruct);
}

void Configure_PB12(void) {
	/* Set variables used */
	GPIO_InitTypeDef GPIO_InitStruct;
	EXTI_InitTypeDef EXTI_InitStruct;
	NVIC_InitTypeDef NVIC_InitStruct;
	
	/* Enable clock for GPIOB */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
	/* Enable clock for SYSCFG */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
	
	/* Set pin as input */
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_Init(GPIOB, &GPIO_InitStruct);
	
	/* Tell system that you will use PB12 for EXTI_Line12 */
	SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource12);
	
	/* PB12 is connected to EXTI_Line12 */
	EXTI_InitStruct.EXTI_Line = EXTI_Line12;
	/* Enable interrupt */
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	/* Interrupt mode */
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	/* Triggers on rising and falling edge */
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	/* Add to EXTI */
	EXTI_Init(&EXTI_InitStruct);

	/* Add IRQ vector to NVIC */
	/* PB12 is connected to EXTI_Line12, which has EXTI15_10_IRQn vector */
	NVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn;
	/* Set priority */
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
	/* Set sub priority */
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x01;
	/* Enable interrupt */
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
	/* Add to NVIC */
	NVIC_Init(&NVIC_InitStruct);
}

/* Set interrupt handlers */
/* Handle PD0 interrupt */
void EXTI0_IRQHandler(void) {
	/* Make sure that interrupt flag is set */
	if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
		/* Do your stuff when PD0 is changed */
		
		
		/* Clear interrupt flag */
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

/* Handle PB12 interrupt */
void EXTI15_10_IRQHandler(void) {
	/* Make sure that interrupt flag is set */
	if (EXTI_GetITStatus(EXTI_Line12) != RESET) {
		/* Do your stuff when PB12 is changed */
		
		
		/* Clear interrupt flag */
		EXTI_ClearITPendingBit(EXTI_Line12);
	}
}

int main(void) {
	/* System init */
	SystemInit();
	/* Configure PD0 as interrupt */
	Configure_PD0();
	/* Configure PB12 as interrupt */
	Configure_PB12();
	
	while (1) {
	
	}
}