stm32 中断嵌套实验源码

下面是基于STM32F4系列芯片，使用Keil MDK编写的中断嵌套实验源码，希望对你有所帮助：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "misc.h"

void Delay(__IO uint32_t nCount);

int main(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    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(GPIOD, &GPIO_InitStructure);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    /* 配置外部中断 */
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* 配置定时器中断 */
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 500;
    TIM_TimeBaseStructure.TIM_Prescaler = 42000;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    while(1)
    {
        GPIO_SetBits(GPIOD, GPIO_Pin_12);
        Delay(1000000);
        GPIO_ResetBits(GPIOD, GPIO_Pin_12);
        Delay(1000000);
        GPIO_SetBits(GPIOD, GPIO_Pin_13);
        Delay(1000000);
        GPIO_ResetBits(GPIOD, GPIO_Pin_13);
        Delay(1000000);
        GPIO_SetBits(GPIOD, GPIO_Pin_14);
        Delay(1000000);
        GPIO_ResetBits(GPIOD, GPIO_Pin_14);
        Delay(1000000);
        GPIO_SetBits(GPIOD, GPIO_Pin_15);
        Delay(1000000);
        GPIO_ResetBits(GPIOD, GPIO_Pin_15);
        Delay(1000000);
    }
}

void Delay(__IO uint32_t nCount)
{
    while(nCount--);
}

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line0);
        GPIO_ToggleBits(GPIOD, GPIO_Pin_12);
    }
}

void TIM2_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        GPIO_ToggleBits(GPIOD, GPIO_Pin_13);
    }
}

在这个例子中，我们使用了一个外部中断和一个定时器中断来演示中断嵌套的实现。在 `main` 函数中，我们首先初始化了GPIO口（用于闪烁LED），然后配置了外部中断和定时器中断的相关参数。在 `EXTI0_IRQHandler` 中，我们实现了外部中断的处理函数，当外部中断触发时，我们会将LED12的状态进行翻转。在 `TIM2_IRQHandler` 中，我们实现了定时器中断的处理函数，当定时器中断触发时，我们会将LED13的状态进行翻转。这个例子中，我们还使用了一个简单的延时函数 `Delay` 来控制LED的闪烁速度。

需要注意的是，中断嵌套的实现需要根据具体的应用场景进行调整，本例中只是一个简单的实现。此外，在实际应用中，还需要考虑中断优先级和中断处理时间等因素，以确保中断嵌套的可靠性和稳定性。