stm32按下按键LED灯全亮500ms后熄灭的代码

好的，下面是基于STM32F1芯片的按键控制LED灯亮起500ms后熄灭的代码：

#include "stm32f10x.h"

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;

    // 开启GPIOA和AFIO时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    // 配置PA0为输入引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructrue.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置PA1为输出引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructrue.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置中断线
    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);

    // 配置NVIC
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    while(1);
}

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        // 等待按键释放
        while(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == 0);

        // 点亮LED灯
        GPIO_SetBits(GPIOA, GPIO_Pin_1);

        // 延时500ms
        Delay(500);

        // 熄灭LED灯
        GPIO_ResetBits(GPIOA, GPIO_Pin_1);

        // 清除中断标志位
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

// 延时函数
void Delay(uint16_t time)
{
    uint16_t i,j;
    for(i=0;i<time;i++)
        for(j=0;j<36000;j++);
}

希望这能帮助到你，如果你还有需要了解的问题，请继续提问。