esp32 的PWM实现

pwm功能的实现

要实现控制灯光亮暗需要控制pwm的占空比来实现
代码：

#include 
#include "../lib/util/AutoPwm.h"
int light = 0;
int status = 0;//0是变量趋势，1是变暗趋势

void setup() {
  Serial.begin(9600);
  PWM_Init(0, 2);//通道0-15，IO
}

void loop() {
  PWM_Control(0, light);
  if(status == 0){
    light += 100;
    if(light >= 1024){
      light = 1024;
      status = 1;
    }
  }else{
    light -= 100;
    if(light <= 0){
      light = 0;
      status = 0;
    }
  }
  delay(100);
}

工具文件在lib下创建AutoPwm.cpp文件

#include 

// PWM的通道，共16个(0-15)，分为高低速两组，
// 高速通道(0-7): 80MHz时钟，低速通道(8-15): 1MHz时钟
// 0-15都可以设置，只要不重复即可，参考上面的列表
// 如果有定时器的使用，千万要避开!!!
/*
 * LEDC Chan to Group/Channel/Timer Mapping
** ledc: 0  => Group: 0, Channel: 0, Timer: 0
** ledc: 1  => Group: 0, Channel: 1, Timer: 0
** ledc: 2  => Group: 0, Channel: 2, Timer: 1
** ledc: 3  => Group: 0, Channel: 3, Timer: 1
** ledc: 4  => Group: 0, Channel: 4, Timer: 2
** ledc: 5  => Group: 0, Channel: 5, Timer: 2
** ledc: 6  => Group: 0, Channel: 6, Timer: 3
** ledc: 7  => Group: 0, Channel: 7, Timer: 3
** ledc: 8  => Group: 1, Channel: 0, Timer: 0
** ledc: 9  => Group: 1, Channel: 1, Timer: 0
** ledc: 10 => Group: 1, Channel: 2, Timer: 1
** ledc: 11 => Group: 1, Channel: 3, Timer: 1
** ledc: 12 => Group: 1, Channel: 4, Timer: 2
** ledc: 13 => Group: 1, Channel: 5, Timer: 2
** ledc: 14 => Group: 1, Channel: 6, Timer: 3
** ledc: 15 => Group: 1, Channel: 7, Timer: 3
*/


// PWM频率，直接设置即可
int Motor_freq_PWM = 1000;

// PWM分辨率，取值为 0-20 之间，这里填写为10，那么后面的ledcWrite
// 这个里面填写的pwm值就在 0 - 2的10次方 之间 也就是 0-1024
int Motor_resolution_PWM = 10;
//频道0-16，不要和其他timer冲突，绑定io
void PWM_Init(int PWM_Channel, int PWM_IO)
{
    pinMode(PWM_IO, OUTPUT);
    ledcSetup(PWM_Channel, Motor_freq_PWM, Motor_resolution_PWM); // 设置通道
    ledcAttachPin(PWM_IO, PWM_Channel);//将 LEDC 通道绑定到指定 IO 口上以实现输出
}
//pwm的占空比
void PWM_Control(int PWM_Channel, int DutyA)
{
    ledcWrite(PWM_Channel, DutyA);
}

AutoPwm.h文件

#ifndef __AUTOPWM_H__
#define __AUTOPWM_H__

#include 

void PWM_Init(int PWM_Channel, int PWM_IO);
void PWM_Control(int PWM_Channel, int DutyA);

#endif

实现现象就是灯光从暗到亮在从亮到暗不停循环