stm32 外部中断

STM32模块操作常用的方式，先配置GPIO与相对模块对接，然后对模块配置；同样在使用外部中断时，我们也是先配置io，然后配置中断，具体配置操作如下：
1. 外部中断配置，
配置相关的结构体，有三如下：
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
相关的头文件
#include “stm32f0xx_exti.h”
#include “stm32f0xx_syscfg.h”
#include “stm32f0xx_misc.h”
#include “stm32f0xx_gpio.h”

void Exti_intconfig(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//configure clock
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* Configure PORTB pin as input pp */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_2;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7|GPIO_Pin_9;GPIO_Init(GPIOB, &GPIO_InitStructure);//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//GPIO_Init(GPIOB, &GPIO_InitStructure);/* Enable SYSCFG clock */RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);/* Connect EXTI0 Line to PA0 pin */SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource7);SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource9);/* Configure EXTI0 line */EXTI_InitStructure.EXTI_Line = EXTI_Line7;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure);EXTI_InitStructure.EXTI_Line = EXTI_Line9;EXTI_Init(&EXTI_InitStructure);/* Enable and set EXTI0 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/* Generate software interrupt: simulate a falling edge applied on Key Button EXTI line */ EXTI_GenerateSWInterrupt(EXTI_Line7|EXTI_Line9); //EXTI_GenerateSWInterrupt(EXTI_Line0);

}
有没有发现，我刚开始是用EXTI_Line0,但是我IO用 GPIO_Pin_7|GPIO_Pin_9,导致我中断无法产生，这里需要说明一点是配置EXTI_Line时，需要与gpio pin相对应，否则无法看到需要的效果。

1. 在中断函数中增加处理.
   在stm32f0xx.h中查看EXTI_Line9和EXTI_Line7属于EXTI4_15_IRQn中断号。然后到中断文件中增加相应函数。
   中断默认在#include “stm32f0xx_it.c”
   void EXTI4_15_IRQHandler(void)//EXTI0_1_IRQn
   {
   static u8 i;

   if(EXTI_GetITStatus(EXTI_Line7) != RESET)
   {
   /* Toggle LED2 */
   if (i == 0)
   {
   i = 1;
   LED1_OFF;
   }
   else
   {
   i = 0;
   LED1_ON;
   }

   /* Clear the EXTI line 0 pending bit */
   EXTI_ClearITPendingBit(EXTI_Line7);
   }

   if(EXTI_GetITStatus(EXTI_Line9) != RESET)
   {
   /* Toggle LED2 */
   if (i == 0)
   {
   i = 1;
   LED1_OFF;
   }
   else
   {
   i = 0;
   LED1_ON;
   }
   //printf(“EXTI0_1_IRQHandler”);

   /* Clear the EXTI line 0 pending bit */
   EXTI_ClearITPendingBit(EXTI_Line9);
   }

2. 设置完成后，在main里初始化一下，便可以实现相应中断。