stm32f405rgt6按键控制led灯亮灭

以下是基于STM32F405RGT6的按键控制LED灯亮灭的示例代码：

首先，需要引入STM32F4xx的头文件和宏定义：

#include "stm32f4xx.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOA

#define KEY_PIN GPIO_Pin_0
#define KEY_PORT GPIOA
#define KEY_EXTI_LINE EXTI_Line0
#define KEY_EXTI_PORT_SOURCE EXTI_PortSourceGPIOA
#define KEY_EXTI_PIN_SOURCE EXTI_PinSource0
#define KEY_EXTI_IRQn EXTI0_IRQn

然后，需要进行GPIO和EXTI的初始化：

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = KEY_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
    GPIO_Init(KEY_PORT, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    SYSCFG_EXTILineConfig(KEY_EXTI_PORT_SOURCE, KEY_EXTI_PIN_SOURCE);

    EXTI_InitStructure.EXTI_Line = KEY_EXTI_LINE;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = KEY_EXTI_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

在中断处理函数中，可以通过读取按键状态来控制LED灯的亮灭：

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(KEY_EXTI_LINE) != RESET)
    {
        if (GPIO_ReadInputDataBit(KEY_PORT, KEY_PIN) == Bit_SET)
        {
            GPIO_SetBits(LED_PORT, LED_PIN);
        }
        else
        {
            GPIO_ResetBits(LED_PORT, LED_PIN);
        }

        EXTI_ClearITPendingBit(KEY_EXTI_LINE);
    }
}

最后，在main函数中调用GPIO_Configuration函数进行初始化即可：

int main(void)
{
    GPIO_Configuration();

    while(1)
    {

    }
}