Stm32按键中断使LED灯闪烁

main.c源代码：

/*
*说明：
*PA0:KEY1;PA1:KEY2;
*PA2:LED1;PA3:LED2;
*PA9:USART1_TX;PA10:USART1_RX
*/
#include "stm32f10x.h"  
#include "stm32f10x_rcc.h"  
#include "stm32f10x_gpio.h"  
#include "stm32f10x_crc.h"
#include "stm32f10x_exti.h"
#include "system_stm32f10x.h" 
#include "misc.h"

void RCC_Configuration(void);  
void GPIO_Configuration(void); 
void EXTI_Configuration(void); 
void NVIC_Configuration(void);

int main()
{  
    RCC_Configuration();  
    GPIO_Configuration();
    EXTI_Configuration();   
    NVIC_Configuration();

    while(1);
}
void RCC_Configuration(void)    
{     
  SystemInit();
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);     
}   

void GPIO_Configuration(void)    
{    
  GPIO_InitTypeDef GPIO_InitStructure; 
  //LED
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3; 
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);  

  //KEY
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOA, &GPIO_InitStructure); 
}
void EXTI_Configuration(void)//外部中断初始化配置
{
    EXTI_InitTypeDef EXTI_InitStructure;

    EXTI_ClearITPendingBit(EXTI_Line0);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); 

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}
void NVIC_Configuration(void)//配置中断优先级
{
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

stm32f10x_it.c源代码（因为用的是外部中断线0中断EXTI0_IRQn，所以直接修改stm32f10x_it.c里面的EXTI0_IRQHandler函数）：

/*引入头文件*/
#include "..\include\stm32f10x.h" 
#include "..\include\stm32f10x_it.h"
#include "..\include\stm32f10x_exti.h"
#include "..\include\stm32f10x_rcc.h"
#include "..\include\stm32f10x_gpio.h" 
#include "..\include\misc.h"
......
void delay_ms(u16 time)       
{      
  u16 i=0;      
  while(time--)       
  {      
    i=12000;      
    while(i--);      
  }      
}
void EXTI0_IRQHandler(void)
{    

  if(EXTI_GetITStatus(EXTI_Line0)==SET)
  {   
     GPIO_WriteBit(GPIOA,GPIO_Pin_2,(BitAction)(Bit_SET-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_2)));
     GPIO_WriteBit(GPIOA,GPIO_Pin_3,(BitAction)(Bit_SET-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_3)));          
  } 
  delay_ms(100);//下降沿销抖

  while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0)!=Bit_SET);

  delay_ms(100);//上升沿销抖

  while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0)!=Bit_SET);

  EXTI_ClearITPendingBit(EXTI_Line0);
}

不要忘记了stm32f10x_it.c里面所有方法的声明头文件stm32f10x_it.h：

#ifndef __STM32F10x_IT_H
#define __STM32F10x_IT_H

/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */  
void NMIException(void);
void HardFaultException(void);
void MemManageException(void);
void BusFaultException(void);
void UsageFaultException(void);
void DebugMonitor(void);
void SVCHandler(void);
void PendSVC(void);
void SysTickHandler(void);
void WWDG_IRQHandler(void);
void PVD_IRQHandler(void);
void TAMPER_IRQHandler(void);
void RTC_IRQHandler(void);
void FLASH_IRQHandler(void);
void RCC_IRQHandler(void);
void EXTI0_IRQHandler(void);
void EXTI1_IRQHandler(void);
void EXTI2_IRQHandler(void);
void EXTI3_IRQHandler(void);
void EXTI4_IRQHandler(void);
void DMA1_Channel1_IRQHandler(void);
void DMA1_Channel2_IRQHandler(void);
void DMA1_Channel3_IRQHandler(void);
void DMA1_Channel4_IRQHandler(void);
void DMA1_Channel5_IRQHandler(void);
void DMA1_Channel6_IRQHandler(void);
void DMA1_Channel7_IRQHandler(void);
void ADC1_2_IRQHandler(void);
void USB_HP_CAN_TX_IRQHandler(void);
void USB_LP_CAN_RX0_IRQHandler(void);
void CAN_RX1_IRQHandler(void);
void CAN_SCE_IRQHandler(void);
void EXTI9_5_IRQHandler(void);
void TIM1_BRK_IRQHandler(void);
void TIM1_UP_IRQHandler(void);
void TIM1_TRG_COM_IRQHandler(void);
void TIM1_CC_IRQHandler(void);
void TIM2_IRQHandler(void);
void TIM3_IRQHandler(void);
void TIM4_IRQHandler(void);
void I2C1_EV_IRQHandler(void);
void I2C1_ER_IRQHandler(void);
void I2C2_EV_IRQHandler(void);
void I2C2_ER_IRQHandler(void);
void SPI1_IRQHandler(void);
void SPI2_IRQHandler(void);
void USART1_IRQHandler(void);
void USART2_IRQHandler(void);
void USART3_IRQHandler(void);
void EXTI15_10_IRQHandler(void);
void RTCAlarm_IRQHandler(void);
void USBWakeUp_IRQHandler(void);
void TIM8_BRK_IRQHandler(void);
void TIM8_UP_IRQHandler(void);
void TIM8_TRG_COM_IRQHandler(void);
void TIM8_CC_IRQHandler(void);
void ADC3_IRQHandler(void);
void FSMC_IRQHandler(void);
void SDIO_IRQHandler(void);
void TIM5_IRQHandler(void);
void SPI3_IRQHandler(void);
void UART4_IRQHandler(void);
void UART5_IRQHandler(void);
void TIM6_IRQHandler(void);
void TIM7_IRQHandler(void);
void DMA2_Channel1_IRQHandler(void);
void DMA2_Channel2_IRQHandler(void);
void DMA2_Channel3_IRQHandler(void);
void DMA2_Channel4_5_IRQHandler(void);

#endif /* __STM32F10x_IT_H */

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