STM32F407ZGT6+L298N ：两路PWM输出 实现电机转速调整

一、硬件要求

STM32F407ZGT6+L298N+两个电机+12V电源

定义了6个GPIO，4个作为逻辑输入（正反转控制） 2两个作为使能端

IN0 IN1 连接 D0 D1，作为电机A的逻辑输入

IN2 IN3 连接 B5 B6，作为电机B的逻辑输入

PF8 为电机A的使能端 PF 7为电机B的使能端

实物链接图

二、代码部分

完整工程文件：


 

Main.c

#include "stm32f4xx.h"
#include "delay.h"
#include "key.h"
#include "led.h" 
#include "pwm.h"
#include "Motor.h"

//STM32F407ZGT6——L298N
//EN_A---PF6
//IN0----PD0
//IN1----PD1
//EN_B---PF7
//IN2----PB5
//IN3----PB6
int main(void)
{

	u8 key;
	u16 Motor1pwmval=499;    
	u16 Motor2pwmval=499;		
	u8 Level1 = 0;
	u8 Level2 = 0;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组 2
	delay_init(168); //初始化延时函数
	MOTOR_Init();
	LED_Init(); //初始化 LED 端口
	KEY_Init();
	TIM13_PWM_Init(500-1,84-1);	//84M/84=1Mhz的计数频率,重装载值500，所以PWM频率为 1M/500=2Khz. 
	TIM11_PWM_Init(500-1,84-1);
	
	LED1 = 1;LED0 = 1;
	
	IN0 = 0;IN1 = 1;ENABLE_A = 1;
	IN2 = 0;IN3 = 1;ENABLE_B = 1;	
  while(1)
	  {
				key=KEY_Scan(0); 		 
				if(key)
				{
		  
					if(key==1)//风速
					{
						Level1++;if(Level1==4)Level1 = 0;						
					}
					else if(key==4)
					{
						Level2++;if(Level2==4)Level2 = 0;	
					}
				}	
				switch(Level1)
				{
					case 0:Motor1pwmval = 499;LED0 = 1;
						break;
					case 1:Motor1pwmval = 250;LED0 = 0;
						break;
					case 2:Motor1pwmval = 100;LED0 = 0;
						break;
					case 3:Motor1pwmval = 0;LED0 = 0;
						break;
				}
				switch(Level2)
				{
					case 0:Motor2pwmval = 499;LED1 = 1;
						break;
					case 1:Motor2pwmval = 250;LED1 = 0;
						break;
					case 2:Motor2pwmval = 100;LED1 = 0;
						break;
					case 3:Motor2pwmval = 0;LED1 = 0;
						break;
				}
			TIM_SetCompare1(TIM13,Motor1pwmval);	//修改比较值，修改占空比
			TIM_SetCompare1(TIM11,Motor2pwmval);	//修改比较值，修改占空比				
		}
}

 Motor.c

#include "Motor.h"
//初始化PB12和PB13为输出口.并使能这两个口的时钟		    
//MOTOR IN1 IN2 IO初始化
void MOTOR_Init(void) 
{

	
	
  GPIO_InitTypeDef  GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //推挽输出
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOD, &GPIO_InitStructure);//初始化	
	
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //推挽输出
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化		
	
 // GPIO_InitTypeDef  GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //推挽输出
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOF, &GPIO_InitStructure);//初始化	
  
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //推挽输出
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化	
	
}