单片机stm32f10x编写光敏电阻调节3.3伏大功率灯亮度（光强越大灯越暗，白天正常光强灯不亮，使用ADC，PWM等模块）望各位找一下错误或者提供一个可实现功能的代码

Question

片机stm32f10x编写光敏电阻调节3.3伏大功率灯亮度（光强越大灯越暗，白天正常光强灯不亮，使用ADC，PWM等模块）望各位找一下错误或者提供一个可实现功能的代码

Answer 1

#include "stm32f10x.h"

void GPIO_Config(void);
void ADC_Config(void);
void PWM_Config(void);
uint16_t ADC_Read(void);
void Set_PWM_DutyCycle(uint32_t dutyCycle);

int main(void) {
    // 配置 GPIO, ADC, PWM
    GPIO_Config();
    ADC_Config();
    PWM_Config();

    while (1) {
        // 读取光敏电阻的值
        uint16_t adcValue = ADC_Read();

        // 将 ADC 值转换为 PWM 占空比
        // 假设 ADC 的值范围是 0-4095，PWM 的值范围是 0-1000
        uint32_t pwmValue = (4095 - adcValue) * 1000 / 4095; // 光强越大，PWM 值越小

        // 限制 PWM 值在 0 到 1000 之间
        if (pwmValue < 0) pwmValue = 0;
        if (pwmValue > 1000) pwmValue = 1000;

        // 设置 PWM 占空比
        Set_PWM_DutyCycle(pwmValue);

        // 简单的延时
        for (volatile int i = 0; i < 10000; i++);
    }
}

void GPIO_Config(void) {
    // 使能 GPIO 时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    // 配置 ADC 引脚 PA0
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // PA0
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; // 模拟输入
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置 PWM 引脚 PB0
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // PB0
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void ADC_Config(void) {
    // 使能 ADC 时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

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

    // 配置 ADC 通道
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

    // 启动 ADC
    ADC_Cmd(ADC1, ENABLE);
    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1));
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

uint16_t ADC_Read(void) {
    // 等待转换完成
    while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
    return ADC_GetConversionValue(ADC1);
}

void PWM_Config(void) {
    // 使能 TIM 时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // 配置 PWM
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 1000
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; // 72MHz / 72 = 1MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // PWM 模式配置
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0; // 初始占空比为 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);
}

void Set_PWM_DutyCycle(uint32_t dutyCycle) {
    TIM_SetCompare1(TIM2, dutyCycle); // 设置 PWM 占空比
}