用STM32写一个LED灯亮度衰减效果的程序

好的，以下是一个用STM32写的LED灯亮度衰减效果的程序：

#include "stm32f10x.h"

int main(void)
{
    // 初始化GPIO口
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 初始化定时器
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 初始化PWM输出
    TIM_OCInitTypeDef TIM_OCInitStructure;
    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);

    // 启动定时器
    TIM_Cmd(TIM2, ENABLE);

    // 循环调整LED灯亮度
    while (1)
    {
        for (int i = 0; i <= 1000; i++)
        {
            TIM_SetCompare1(TIM2, i);
            for (int j = 0; j < 10000; j++);
        }
        for (int i = 1000; i >= 0; i--)
        {
            TIM_SetCompare1(TIM2, i);
            for (int j = 0; j < 10000; j++);
        }
    }
}

这个程序使用了STM32的定时器和PWM输出功能来实现LED灯亮度衰减效果。程序中使用了一个循环来不断调整LED灯的亮度，先从0逐渐增加到1000，再从1000逐渐减少到0，然后再从0开始循环。