if(EXTI_GetITStatus(KEY2_INT_EXTI_LINE) != RESET) { if(count2<5) { p=p/2; time=time/2; count2++; } if(count2>=5 && count2<10) { p=p*2; time=time*2; count2++; } if(count2>=10) { count2=0; } //清除中断标志位 EXTI_ClearITPendingBit(KEY2_INT_EXTI_LINE); }

这段代码看起来像是 STM32F系列单片机上的外部中断处理函数，当KEY2按键被按下时，会执行相应的处理操作。其中，count2变量的值在5次以内会除以2，同时time也会除以2；在5~10次之间，count2变量的值会乘以2，同时time也会乘以2；当count2大于等于10时，count2会被重置为0。最后，该中断标志位会被清除。

相关问题

写一个stm32单片机的程序：使用4个LED，3个按键，按键1控制正向流水灯，按键2控制反向流水灯，按键3控制流水灯的数量（1个，2个，3个））

本题答案为参考答案，仅供参考。

#include "stm32f10x.h"

#define LED1_PIN        GPIO_Pin_0
#define LED2_PIN        GPIO_Pin_1
#define LED3_PIN        GPIO_Pin_2
#define LED4_PIN        GPIO_Pin_3

#define KEY1_PIN        GPIO_Pin_4
#define KEY2_PIN        GPIO_Pin_5
#define KEY3_PIN        GPIO_Pin_6

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    
    // 使能GPIOA和AFIO时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
    // 使能EXTI0和EXTI1中断
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn | EXTI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    // 配置LED引脚为推挽输出
    GPIO_InitStructure.GPIO_Pin = LED1_PIN | LED2_PIN | LED3_PIN | LED4_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    // 配置KEY1引脚为上拉输入，并使能其中断
    GPIO_InitStructure.GPIO_Pin = KEY1_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource4);
    EXTI_InitStructure.EXTI_Line = EXTI_Line4;
    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KEY2引脚为上拉输入，并使能其中断
    GPIO_InitStructure.GPIO_Pin = KEY2_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource5);
    EXTI_InitStructure.EXTI_Line = EXTI_Line5;
    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KEY3引脚为上拉输入，并使能其中断
    GPIO_InitStructure.GPIO_Pin = KEY3_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource6);
    EXTI_InitStructure.EXTI_Line = EXTI_Line6;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
    
    // 初始化流水灯数量为1
    uint8_t count = 1;
    
    while (1)
    {
        // 根据流水灯数量控制LED输出
        switch (count)
        {
        case 1:
            GPIO_SetBits(GPIOA, LED1_PIN);
            GPIO_ResetBits(GPIOA, LED2_PIN | LED3_PIN | LED4_PIN);
            break;
        case 2:
            GPIO_SetBits(GPIOA, LED1_PIN | LED2_PIN);
            GPIO_ResetBits(GPIOA, LED3_PIN | LED4_PIN);
            break;
        case 3:
            GPIO_SetBits(GPIOA, LED1_PIN | LED2_PIN | LED3_PIN);
            GPIO_ResetBits(GPIOA, LED4_PIN);
            break;
        default:
            GPIO_SetBits(GPIOA, LED1_PIN | LED2_PIN | LED3_PIN | LED4_PIN);
            break;
        }
    }
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        // 控制正向流水灯
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void EXTI1_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line1) != RESET)
    {
        // 控制反向流水灯
        EXTI_ClearITPendingBit(EXTI_Line1);
    }
}

void EXTI9_5_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line5) != RESET)
    {
        // 控制流水灯数量
        EXTI_ClearITPendingBit(EXTI_Line5);
    }
}

写一段STM32F103CBT6的长按3S开机，短按循环切换红黄绿灯，双击循环切换蓝白灯，长按2S关机的程序

这是一个基于STM32F103微控制器的基本控制程序，使用GPIO模块来操作LED灯，并利用中断机制处理按键的长按和短按事件。以下是简化的伪代码示例：

#include "stm32f10x.h"

#define LED_R GPIO_Pin_2 // 红色LED
#define LED_Y GPIO_Pin_3 // 黄色LED
#define LED_G GPIO_Pin_4 // 绿色LED
#define LED_B GPIO_Pin_5 // 蓝色LED
#define LED_W GPIO_Pin_6 // 白色LED

#define KEY_PIN GPIO_Pin_7 // 按键输入
#define KEY_DOWN_LEVEL 0 // 下拉状态

// 定义延时常数
#define LONG_PRESS_DELAY 3000 // 长按3秒
#define SHORT_PRESS_DELAY 500 // 短按500毫秒
#define DOUBLE_CLICK_DELAY 100 // 双击间隔时间

volatile uint32_t long_press_count = 0;
volatile bool short_press_flag = false;

void led_state(uint8_t led) {
    GPIO_SetBits(LED_PORT, led); // 开启指定颜色LED
    HAL_Delay(SHORT_PRESS_DELAY);
    GPIO_ResetBits(LED_PORT, led); // 关闭LED
}

void EXTI_IRQHandler() {
    if (EXTI_GetITStatus(KEY_PIN_EXTI_LINE) != RESET) { // 判断是否有按键按下
        EXTI_ClearITPendingBit(KEY_PIN_EXTI_LINE);

        if (GPIO_ReadPin(KEY_PIN) == KEY_DOWN_LEVEL) { // 检测按键状态
            if (long_press_count > 0) {
                // 长按处理：关闭所有灯并等待释放
                long_press_count--;
                if (long_press_count == 0) {
                    GPIO_ResetBits(GPIOA, LED_ALL); // 关闭所有LED
                    // 清零计数并退出长按模式
                    long_press_count = 0;
                }
            } else if (!short_press_flag) {
                // 短按处理：切换LED颜色
                short_press_flag = true;
                led_state((led_state == LED_R) ? LED_Y : LED_R);
            } else {
                // 双击处理：切换蓝白灯
                led_state(short_press_flag ? LED_B : LED_W);
                short_press_flag = !short_press_flag;
            }
        }
    }
}

int main(void) {
    // 初始化GPIO和EXTI
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;

    // ... (其他GPIO配置)

    EXTI_InitStructure.EXTI_Line = KEY_PIN_EXTI_LINE;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode Falling;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    while (1) {
        HAL_GPIO_TogglePin(LED_PORT, LED_R | LED_Y | LED_G | LED_B | LED_W); // 循环切换所有灯
        HAL_Delay(LONG_PRESS_DELAY * 2); // 每隔一定时间检查长按
    }
}