stm32外部中断控制led灯亮灭

以下是一个基于STM32外部中断的控制LED灯亮灭的示例代码：

#include "stm32f10x.h"

GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

void LED_Init(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void EXTI_Config(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        GPIO_WriteBit(GPIOC, GPIO_Pin_13, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_13)));
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

int main(void)
{
    LED_Init();
    EXTI_Config();

    while (1)
    {
        // Do nothing
    }
}

在此示例中，我们使用了STM32的外部中断功能，当按下外部中断引脚PB0时，就会触发中断处理函数`EXTI0_IRQHandler`。在中断处理函数中，我们通过检查中断状态位来确定中断是否发生，并使用GPIO操作来切换LED灯的状态。在主函数中，我们初始化了LED灯和外部中断，并进入了一个无限循环，等待中断的发生。