编写代码基于stm32f407开发板设置ADC调节电阻控制LED亮度等级

好的，我可以为你提供一份基于STM32F407开发板的ADC控制LED亮度等级的代码，但需要说明的是，由于硬件条件的不同，代码可能需要根据具体情况进行调整。

以下是示例代码：

#include "stm32f4xx.h"

/* 定义ADC GPIO引脚 */
#define ADC_GPIO_PORT    GPIOA
#define ADC_GPIO_PIN     GPIO_Pin_0

/* 定义LED GPIO引脚 */
#define LED_GPIO_PORT    GPIOD
#define LED_GPIO_PIN     GPIO_Pin_12

/* 定义ADC通道号 */
#define ADC_CHANNEL      ADC_Channel_0

/* 定义ADC采样时间 */
#define ADC_SAMPLE_TIME  ADC_SampleTime_480Cycles

/* 定义PWM引脚 */
#define PWM_GPIO_PORT    GPIOA
#define PWM_GPIO_PIN     GPIO_Pin_6
#define PWM_GPIO_AF      GPIO_AF_TIM3
#define PWM_TIM          TIM3

/* 定义PWM频率 */
#define PWM_FREQ         10000
#define PWM_PERIOD       (84000000 / PWM_FREQ - 1)

/* 定义调节灯亮度的最大值 */
#define MAX_BRIGHTNESS   100

/* 定义ADC采样结果 */
__IO uint16_t ADC_Result;

/* 函数声明 */
void GPIO_Config(void);
void ADC_Config(void);
void TIM_Config(void);

int main(void)
{
    /* 初始化GPIO、ADC和PWM */
    GPIO_Config();
    ADC_Config();
    TIM_Config();

    while (1)
    {
        /* 获取当前ADC采样结果并计算灯亮度 */
        uint16_t brightness = ADC_Result * MAX_BRIGHTNESS / 4095;

        /* 更新PWM占空比 */
        TIM_SetCompare1(PWM_TIM, PWM_PERIOD * brightness / MAX_BRIGHTNESS);
    }
}

void GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* 使能GPIOA、GPIOD时钟 */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOD, ENABLE);

    /* 配置ADC GPIO引脚为模拟输入 */
    GPIO_InitStructure.GPIO_Pin = ADC_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(ADC_GPIO_PORT, &GPIO_InitStructure);

    /* 配置LED GPIO引脚为推挽输出 */
    GPIO_InitStructure.GPIO_Pin = LED_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);

    /* 配置PWM GPIO引脚为复用功能 */
    GPIO_InitStructure.GPIO_Pin = PWM_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(PWM_GPIO_PORT, &GPIO_InitStructure);
    GPIO_PinAFConfig(PWM_GPIO_PORT, GPIO_PinSource6, PWM_GPIO_AF);
}

void ADC_Config(void)
{
    ADC_InitTypeDef ADC_InitStructure;

    /* 使能ADC时钟 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    /* 配置ADC为单通道、扫描模式和连续转换模式 */
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    /* 配置ADC通道为PC0和采样时间为480个周期 */
    ADC_RegularChannelConfig(ADC1, ADC_CHANNEL, 1, ADC_SAMPLE_TIME);

    /* 使能ADC DMA */
    ADC_DMACmd(ADC1, ENABLE);

    /* 使能ADC */
    ADC_Cmd(ADC1, ENABLE);

    /* 开始ADC转换 */
    ADC_SoftwareStartConv(ADC1);
}

void TIM_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    /* 使能GPIOA、GPIOB、TIM3时钟 */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    /* 配置PWM GPIO引脚为复用功能 */
    GPIO_InitStructure.GPIO_Pin = PWM_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(PWM_GPIO_PORT, &GPIO_InitStructure);
    GPIO_PinAFConfig(PWM_GPIO_PORT, GPIO_PinSource6, PWM_GPIO_AF);

    /* 配置TIM3为PWM模式 */
    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(PWM_TIM, &TIM_TimeBaseStructure);

    /* 配置TIM3通道1为PWM输出 */
    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(PWM_TIM, &TIM_OCInitStructure);

    /* 使能TIM3 */
    TIM_Cmd(PWM_TIM, ENABLE);
}

这份代码实现了通过ADC采样电阻电压来控制LED亮度等级。具体实现方式是，将ADC采样结果映射到0-100的范围内，将PWM占空比设置为相应的值，从而控制LED亮度等级。需要注意的是，示例代码中使用了TIM3的通道1作为PWM输出，如果需要更换为其他GPIO引脚，需要进行相应的修改。