(使用直流电机点亮LED. 发电机??? NO?YES?)

原理:采集电机输入的电压信号(adc)动态改变PWM

STM32_Study: STM32_Study (gitee.com)

不逼逼 贴代码

motor_led.c

/**
 * @file motor_led.c
 * @author WaterFairy (995637517@qq.com)
 * @brief 由电机信号强弱点灯
 * @version 1.0.0
 * @date 2022-04-28 14:04:59
 *
 * 1.电机负极接GND,正极接PA1.(反接也可;PA1:adc采集端口)
 * 2.PA8接PC13(PA8:PWM输出端;PC13:LED负极端口)
 * @copyright Copyright (c) 2022
 *
 */
#include "stm32f10x.h"
#include <stdio.h>
/**
 * @brief 初始化adc
 * 由电机转动输入电压信号
 *
 */
void init_adc(void)
{
    // 1. gpio 配置
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef gpio_structure;
    gpio_structure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入
    gpio_structure.GPIO_Pin = GPIO_Pin_1;     // pin_1
    gpio_structure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &gpio_structure);

    // 2. adc 配置
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_ADCCLKConfig(RCC_PCLK2_Div6);                               //分频
    ADC_InitTypeDef adc_structure;                                  // adc结构体
    adc_structure.ADC_Mode = ADC_Mode_Independent;                  //独立模式(单adc模式) / 双adc模式 = 单
    adc_structure.ADC_DataAlign = ADC_DataAlign_Right;              //对齐方式 = 右对齐
    adc_structure.ADC_ContinuousConvMode = DISABLE;                 //连续模式 = 非
    adc_structure.ADC_ScanConvMode = DISABLE;                       //扫描模式 = 非
    adc_structure.ADC_NbrOfChannel = 1;                             //通道数 = 1
    adc_structure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //外部触发转换源 = 使用软件触发
    ADC_Init(ADC1, &adc_structure);

    // 3. 规则组通道配置
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);

    // 4. 开启adc / 开启软件转换
    ADC_Cmd(ADC1, ENABLE);
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
    // 5. 校准配置
    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1))
        ;
    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1))
        ;
}

/**
 * @brief 初始化pwm
 * 由电压信号转换波形信号
 *
 */
void init_pwm(void)
{
    // 1.gpio
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef gpio_structure;
    gpio_structure.GPIO_Mode = GPIO_Mode_AF_PP;   //输入模式
    gpio_structure.GPIO_Pin = GPIO_Pin_8;         //引脚
    gpio_structure.GPIO_Speed = GPIO_Speed_50MHz; //速度
    GPIO_Init(GPIOA, &gpio_structure);

    // 2.tim
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
    TIM_InternalClockConfig(TIM1);
    TIM_TimeBaseInitTypeDef tim_base_structure;
    tim_base_structure.TIM_ClockDivision = TIM_CKD_DIV1;     //时钟分频
    tim_base_structure.TIM_CounterMode = TIM_CounterMode_Up; //计数方式
    tim_base_structure.TIM_Period = 4096 - 1;                //周期
    tim_base_structure.TIM_Prescaler = 72 - 1;               //预分频
    tim_base_structure.TIM_RepetitionCounter = 0;            //重新计数
    TIM_TimeBaseInit(TIM1, &tim_base_structure);
    TIM_ClearFlag(TIM1, TIM_FLAG_Update);
    TIM_Cmd(TIM1, ENABLE);

    // 3.pwm
    TIM_OCInitTypeDef tim_oc_structure;
    TIM_OCStructInit(&tim_oc_structure);
    tim_oc_structure.TIM_OCMode = TIM_OCMode_PWM1;             // PWM1模式
    tim_oc_structure.TIM_OCPolarity = TIM_OCPolarity_Low;      //占空比内输出低电平
    tim_oc_structure.TIM_OutputState = TIM_OutputState_Enable; //输出
    tim_oc_structure.TIM_Pulse = 0;                            //默认0 ,阈值 CCR Capture Compare Register
    TIM_OC1Init(TIM1, &tim_oc_structure);
    //注:高级定时器使用(STM1)
    TIM_CtrlPWMOutputs(TIM1, ENABLE); // MOE 主输出使能

    // 4.nvic
    TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);      // TIM1中断配置
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // NVIC 优先级分组
    NVIC_InitTypeDef nvic_structure;
    nvic_structure.NVIC_IRQChannel = TIM1_UP_IRQn;
    nvic_structure.NVIC_IRQChannelCmd = ENABLE;
    nvic_structure.NVIC_IRQChannelPreemptionPriority = 1;
    nvic_structure.NVIC_IRQChannelSubPriority = 1;
    NVIC_Init(&nvic_structure);
}

/**
 * @brief
 * 获取adc值
 */
uint16_t get_motor_led_adc_value(void)
{
    uint8_t times = 10;       //采样次数
    uint32_t total_value = 0; //采样总值
    for (uint8_t i = 0; i < times; i++)
    {
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);        //使能指定的 ADC1 的软件转换启动功能
        while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)) //规则组/注入组转换结束
            ;
        total_value += ADC_GetConversionValue(ADC1);
    }
    return total_value / times; //求平均
}

/**
 * @brief TIM1的更新中断:TIM1_UP_IRQHandler
 * 动态改变输出波形
 * 关键:TIM_SetCompare1
 * 为避免其它文件重定义该函数,注销该代码.如使用,请打开.
 */
void TIM1_UP_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM1, TIM_IT_Update))
    {
        //电压
        uint16_t voltage = get_motor_led_adc_value();
        printf("voltage:%f\n", (float)voltage / 4096 * 3.3);
        TIM_SetCompare1(TIM1, voltage);
        //手动清除中断标志位
        TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
    }
}

void motor_led_init(void)
{
    init_adc();
    init_pwm();
}

motor_led.h

/**
 * @file motor_led.h
 * @author WaterFairy (995637517@qq.com)
 * @brief 
 * @version 1.0.0
 * @date 2022-04-28 14:04:08
 * 
 * @copyright Copyright (c) 2022
 * 
 */
#ifndef __MOTOR_LED_H__
#define __MOTOR_LED_H__

void motor_led_init(void);

#endif