stm32外部中断实现按下KEY1 红灯闪烁（频率肉眼可见）再一次按下KYE1 红灯停止闪烁-Go服务器开发

要实现按下KEY1时红灯闪烁，可以使用STM32的外部中断功能和定时器来完成。以下是一个简单的代码示例：

#include "stm32f4xx.h"

void GPIO_Config(void);
void EXTI_Config(void);
void TIM_Config(void);

volatile uint8_t buttonPressed = 0;

int main(void) {
    GPIO_Config();
    EXTI_Config();
    TIM_Config();
    
    while (1) {
        if (buttonPressed) {
            // 红灯闪烁
            GPIO_ToggleBits(GPIOD, GPIO_Pin_14);
            buttonPressed = 0;
        }
    }
}

void GPIO_Config(void) {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOD, ENABLE);

    // 配置GPIOD的Pin 12和Pin 14作为输出引脚（红色LED）
    GPIO_InitTypeDef gpioInitStruct;
    gpioInitStruct.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_14;
    gpioInitStruct.GPIO_Mode = GPIO_Mode_OUT;
    gpioInitStruct.GPIO_OType = GPIO_OType_PP;
    gpioInitStruct.GPIO_Speed = GPIO_Speed_100MHz;
    gpioInitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &gpioInitStruct);

    // 配置GPIOA的Pin 0作为输入引脚（KEY1）
    gpioInitStruct.GPIO_Pin = GPIO_Pin_0;
	gpioInitStruct.GPIO_Mode = GPIO_Mode_IN;
	gpioInitStruct.GPIO_PuPd = GPIO_PuPd_DOWN; 
	GPIO_Init(GPIOA, &gpioInitStruct);
}

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

	// 将PA0引脚连接到EXTI线路
	SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

	// 配置外部中断线路
	EXTI_InitTypeDef extiInitStruct;
	extiInitStruct.EXTI_Line = EXTI_Line0;
	extiInitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	extiInitStruct.EXTI_Trigger = EXTI_Trigger_Rising; // 上升沿触发中断
	extiInitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&extiInitStruct);

	// 配置中断优先级
	NVIC_InitTypeDef nvicInitStructure;
	nvicInitStructure.NVIC_IRQChannel = EXTI0_IRQn;
	nvicInitStructure.NVIC_IRQChannelPreemptionPriority = 0x00; 
	nvicInitStructure.NVIC_IRQChannelSubPriority = 0x01;
	nvicInitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&nvicInitStructure);
}

void TIM_Config(void) {
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

	TIM_TimeBaseInitTypeDef timBaseInitStruct;
	timBaseInitStruct.TIM_Period = 9999; 
	timBaseInitStruct.TIM_Prescaler = 8399; 
	timBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
	timBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; 
	TIM_TimeBaseInit(TIM2, &timBaseInitStruct);
	
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
	TIM_Cmd(TIM2, ENABLE);

	NVIC_InitTypeDef nvicInitStructure;
	nvicInitStructure.NVIC_IRQChannel = TIM2_IRQn;
	nvicInitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	nvicInitStructure.NVIC_IRQChannelSubPriority = 1;
	nvicInitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&nvicInitStructure);
}

void EXTI0_IRQHandler(void) {
	if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
		buttonPressed = 1;
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

void TIM2_IRQHandler(void) {
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
        // 红灯停止闪烁
        GPIO_ResetBits(GPIOD, GPIO_Pin_14);
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    }
}

这段代码使用PA0引脚连接到外部中断线，并配置为上升沿触发中断。当按下KEY1时，外部中断触发，将buttonPressed标志位置为1。在主循环中检查该标志位，如果为1，则切换红灯的状态。同时，通过定时器TIM2实现红灯停止闪烁的功能。

请注意，在编写代码之前，请根据您所使用的具体STM32型号和开发环境进行适当的修改和配置。

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