main.c

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#include "stm32f10x.h"

GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* Private function prototypes -----------------------------------------------*/
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void Delay(vu32 nCount);
/* Private functions ---------------------------------------------------------*/

int main(void)
{
  SystemInit();

  GPIO_Configuration();

  NVIC_Configuration();

  /* Connect EXTI Line3 to PA.3 */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource3);

  /* Configure EXTI Line9 to generate an interrupt on falling edge */  
  EXTI_InitStructure.EXTI_Line = EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

	while(1)
	{
		GPIO_SetBits(GPIOA, GPIO_Pin_0);//点亮LED1
		Delay(0x1fffff);	//延时
		GPIO_ResetBits(GPIOA, GPIO_Pin_0);//关闭LED1
		
		GPIO_SetBits(GPIOA, GPIO_Pin_1);//点亮LED2
		Delay(0x1fffff);	//延时
		GPIO_ResetBits(GPIOA, GPIO_Pin_1);//关闭LED2 

	}
}

void GPIO_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 ; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //带上拉输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出频率最大50M
	GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化
 	
	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_3; //选择引脚3
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮点输入
	GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA3引脚
}

 void NVIC_Configuration(void)
{
 NVIC_InitTypeDef NVIC_InitStructure;
  
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   


  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  
  /* Enable the EXTI3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

 void Delay(vu32 nCount)
{
  for(; nCount != 0; nCount--);
}