stm32如何用光敏电阻孔子led亮暗的代码

下面是一份简单的示例代码，用于通过光敏电阻控制LED的亮度：

#include "stm32f10x.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC
#define ADC_PIN GPIO_Pin_0
#define ADC_PORT GPIOA

void GPIO_Configuration(void);
void ADC_Configuration(void);

int main(void)
{
    GPIO_Configuration();
    ADC_Configuration();

    while(1)
    {
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
        uint16_t adc_value = ADC_GetConversionValue(ADC1);

        // 将读取到的 ADC 值映射到 LED 的亮度范围内
        uint16_t pwm_duty = (uint16_t)(adc_value * 255 / 4095);

        // 使用 PWM 信号控制 LED 的亮度
        TIM_SetCompare1(TIM3, pwm_duty);

        // 稍作延时
        for(int i=0; i<100000; i++);
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = ADC_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(ADC_PORT, &GPIO_InitStructure);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    TIM_TimeBaseStructure.TIM_Period = 255;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &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(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

void ADC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_InitTypeDef ADC_InitStructure;
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_1Cycles5);

    ADC_Cmd(ADC1, ENABLE);
}

该代码使用了STM32的ADC模块读取光敏电阻的电压值，并将其映射到LED的亮度范围内，通过PWM信号控制LED的亮度。需要注意的是，该示例代码中并没有对光敏电阻的阈值设置进行处理，可以根据实际情况进行调整。