使用STM32的外部中断控制四个外部独立按键分别控制TIM2时钟下的 PWM输出的四路方波点亮的LED灯的亮灭的完整代码及外部独立按键和LED的控制引脚

好的，下面是使用STM32外部中断控制四个外部独立按键分别控制TIM2时钟下的PWM输出的四路方波点亮的LED灯的亮灭的完整代码及外部独立按键和LED的控制引脚。

#include "stm32f10x.h"

void GPIO_Configuration(void);
void NVIC_Configuration(void);
void EXTI_Configuration(void);
void TIM2_Configuration(void);

int main(void)
{
    GPIO_Configuration();
    NVIC_Configuration();
    EXTI_Configuration();
    TIM2_Configuration();

    while(1)
    {
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    // 配置外部独立按键引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置LED灯引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    // 配置外部中断0所在的中断向量表
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // 配置外部中断1所在的中断向量表
    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
    NVIC_Init(&NVIC_InitStructure);

    // 配置外部中断2所在的中断向量表
    NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
    NVIC_Init(&NVIC_InitStructure);

    // 配置外部中断3所在的中断向量表
    NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource2);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource3);

    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);

    EXTI_InitStructure.EXTI_Line = EXTI_Line1;
    EXTI_Init(&EXTI_InitStructure);

    EXTI_InitStructure.EXTI_Line = EXTI_Line2;
    EXTI_Init(&EXTI_InitStructure);

    EXTI_InitStructure.EXTI_Line = EXTI_Line3;
    EXTI_Init(&EXTI_InitStructure);
}

void TIM2_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 999; // 设置定时器周期为1ms
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 设置时钟分频系数为72，得到定时器时钟为1MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC2Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC4Init(TIM2, &TIM_OCInitStructure);
    TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_ARRPreloadConfig(TIM2, ENABLE);
    TIM_Cmd(TIM2, ENABLE);
}

void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        TIM_SetCompare1(TIM2, 250); // 设置PWM输出的占空比为25%
        GPIO_SetBits(GPIOB, GPIO_Pin_8); // 点亮LED1
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void EXTI1_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line1) != RESET)
    {
        TIM_SetCompare2(TIM2, 500); // 设置PWM输出的占空比为50%
        GPIO_SetBits(GPIOB, GPIO_Pin_9); // 点亮LED2
        EXTI_ClearITPendingBit(EXTI_Line1);
    }
}

void EXTI2_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line2) != RESET)
    {
        TIM_SetCompare3(TIM2, 750); // 设置PWM输出的占空比为75%
        GPIO_SetBits(GPIOB, GPIO_Pin_10); // 点亮LED3
        EXTI_ClearITPendingBit(EXTI_Line2);
    }
}

void EXTI3_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line3) != RESET)
    {
        TIM_SetCompare4(TIM2, 999); // 设置PWM输出的占空比为100%
        GPIO_SetBits(GPIOB, GPIO_Pin_11); // 点亮LED4
        EXTI_ClearITPendingBit(EXTI_Line3);
    }
}

其中，外部独立按键引脚为PA0、PA1、PA2、PA3，LED灯引脚为PB8、PB9、PB10、PB11。在`EXTI0_IRQHandler()`、`EXTI1_IRQHandler()`、`EXTI2_IRQHandler()`、`EXTI3_IRQHandler()`中分别处理四个外部中断，设置PWM输出的占空比和点亮对应的LED灯。在`TIM2_Configuration()`中配置了TIM2的基本参数和四个PWM输出通道的参数。