stm32按键控制led的亮度具体代码

由于您没有指定具体的板子型号和按键类型，以下是一份通用的代码示例，您可以根据自己的情况进行适当修改：

#include "stm32f10x.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC

#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA

uint16_t led_brightness = 0;

void led_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void button_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);
}

int main(void)
{
    led_init();
    button_init();
    
    while (1)
    {
        if (GPIO_ReadInputDataBit(BUTTON_PORT, BUTTON_PIN) == RESET)
        {
            // 按键按下，增加亮度
            led_brightness += 50;
            if (led_brightness > 1000) led_brightness = 1000;
            TIM_SetCompare2(TIM3, led_brightness);
        }
        else
        {
            // 按键松开，降低亮度
            led_brightness -= 50;
            if (led_brightness < 0) led_brightness = 0;
            TIM_SetCompare2(TIM3, led_brightness);
        }
        // 延时一段时间，避免按键抖动
        for (int i = 0; i < 1000000; i++);
    }
}

这份代码使用了定时器PWM输出控制LED亮度，具体实现方式请参考以下链接：

[STM32定时器PWM输出控制LED亮度的方法](https://www.jianshu.com/p/78c54f3f3b45)