stm32f103c8t6adcLED灯PWM代码

以下是一个简单的基于STM32F103C8T6的ADC和PWM控制LED灯的代码示例：

#include "stm32f10x.h"

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    // 使能ADC1和GPIOA的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE);

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

    // ADC1配置
    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);

    // 使能ADC1
    ADC_Cmd(ADC1, ENABLE);
}

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

    // 使能TIM2和GPIOB的时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // 配置PB3为PWM输出
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // TIM2配置
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // PWM输出配置
    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_OC3Init(TIM2, &TIM_OCInitStructure);

    // 使能TIM2
    TIM_Cmd(TIM2, ENABLE);
}

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

    while (1)
    {
        // 读取ADC值
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
        uint16_t adc_value = ADC_GetConversionValue(ADC1);

        // 将ADC值映射到PWM占空比
        uint16_t pwm_value = adc_value * 1000 / 4095;

        // 设置PWM占空比
        TIM_SetCompare3(TIM2, pwm_value);

        // 稍微延时一下
        for (int i = 0; i < 100000; i++);
    }
}

这个代码示例中，我们使用了STM32F103C8T6的ADC模块读取了PA0引脚的模拟输入，并将读取到的值映射到了PWM占空比上，然后使用TIM2模块的PWM输出控制了PB3引脚的LED灯。