stm32f405按键控制led灯亮灭

以下是一个使用STM32F405按键控制LED灯亮灭的示例代码：

#include "stm32f4xx.h"

void GPIO_Configuration(void);
void EXTI_Configuration(void);
void delay(uint32_t nCount);

int main(void)
{
    GPIO_Configuration();
    EXTI_Configuration();

    while (1)
    {
    }
}

void GPIO_Configuration(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;

    // Configure PA0 as input with pull-up resistor
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Configure PC13 as output
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void EXTI_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    // Configure EXTI Line0
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

    EXTI_InitTypeDef EXTI_InitStructure;
    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);

    NVIC_InitTypeDef NVIC_InitStructure;
    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);
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        // Toggle PC13
        GPIO_ToggleBits(GPIOC, GPIO_Pin_13);

        // Clear the EXTI line pending bit
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void delay(uint32_t nCount)
{
    for(; nCount != 0; nCount--);
}

此代码将PA0配置为输入，PC13配置为输出。当按下PA0时，将触发外部中断，并切换PC13的状态。您可以通过修改EXTI_InitStructure.EXTI_Trigger变量的值来更改触发条件，例如EXTI_Trigger_Rising将在上升沿触发外部中断。