(资料图片仅供参考)

使用STM32MIN开发板操作，对电机进行PWM简单调速，使用通用定时器TIM3上，下图为MIN板定时器引脚分布图

mian.c#include "delay.h"#include "usart.h"#include "motor.h"   int main(void) {    delay_init();                                      //延迟函数初始化      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);   //中断优先级分组设置  uart_init(115200);                                  //串口初始化设置    TIM3_PWM_Init(450,7199);   //PWM输出初始化    while(1)  {     //设置通道2的占空比实现PWM调速，这里是100，在0~450间，越小速度越快  TIM_SetCompare2(TIM3,300);  P5_HIGH;  P4_LOW;  }   }

motor.c#include "motor.h"#include "usart.h"  //TIM3 PWM部分初始化//PWM输出初始化//arr：自动重装载值//psc 时钟预分频系数void TIM3_PWM_Init(u16 arr,u16 psc){    GPIO_InitTypeDef GPIO_InitStructure;  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;  TIM_OCInitTypeDef  TIM_OCInitStructure;  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);  //使能定时器3时钟  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIO外设时钟      //初始化IOPA4  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //推挽输出  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_ResetBits(GPIOA,GPIO_Pin_4);            //初始化IOPA5  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;   //推挽输出  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOA,&GPIO_InitStructure);  GPIO_ResetBits(GPIOA,GPIO_Pin_5);        //初始化IOPA7  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   //复用推挽输出  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOA,&GPIO_InitStructure);    //初始化TIM3,  TIM_TimeBaseStructure.TIM_Period = arr; //自动重装载值  TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频系数  TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式  TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);      //初始化TIM3 Channel2    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择PWM模式2  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low ; //输出比较极性地  TIM_OC2Init(TIM3, &TIM_OCInitStructure);      TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能定时器3通道2预装载寄存器    TIM_Cmd(TIM3, ENABLE);  //使能TIM3}

motor.h#ifndef __TIMER_H#define __TIMER_H#include "sys.h"#define P4 GPIO_Pin_4#define P5 GPIO_Pin_5//#define MORTOR_PROT GPIOA#define P4_LOW GPIO_ResetBits(GPIOA,P4)#define P4_HIGH GPIO_SetBits(GPIOA,P4)#define P5_LOW GPIO_ResetBits(GPIOA,P5)#define P5_HIGH GPIO_SetBits(GPIOA,P5)  void TIM3_PWM_Init(u16 arr,u16 psc);#endif