stm32定时器引脚分布，定时器2~7、9~14基本配置，PWM波电机调速简单代码

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