STM32 single chip microcomputer drive L298N

L298N The working principle and circuit wiring of the are explained in the blog in the previous chapter , The differences between the three wiring methods are explained , And suggestions .https://blog.csdn.net/m0_59113542/article/details/121038048?spm=1001.2014.3001.5501

This article mainly explains STM32 Driver program

 

One 、L298N Logical control of

  as everyone knows ,L298N Two motors can be driven , They are channels A、 passageway B.

ENA It's a channel A The enabling end of , That is, the channel A Enabled jumper cap （ The jumper cap is inserted to enable , Don't worry about it ）;

IN1、IN2： Logic input pin （ The four row pins on the board are , The two on the left are channels A Of IN1、IN2; The one on the right is the channel B Of , When you use that channel, you use the corresponding two pins to control ）, By controlling the high and low levels of these two pins according to the table, the forward and reverse rotation of the motor can be controlled ;

Two 、 matters needing attention

L298N You can use the three ways introduced in my article , But it's GND It must be connected with the SCM GND Connected to a , Ensure common land , Thus there is a reference level .

3、 ... and 、STM32 The driver

Use PWM The duty cycle controls its speed ,PA4→IN1、PA5→IN2 The logic level of controls its forward and reverse .

main.c file

#include "delay.h"
#include "usart.h"
#include "timer.h"

 int main(void)
 {		
	delay_init();	                                     // Delay function initialization 	  
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 	 // Interrupt priority grouping settings 
	uart_init(115200);	                                 // Serial port initialization settings 
 	
	TIM3_PWM_Init(450,7199);   //PWM Output initialization 
   	while(1)
	{
	    // Set up channels 2 The duty cycle of PWM adjust speed , Here is 100, stay 0~450 between , The smaller the speed, the faster 
 		TIM_SetCompare2(TIM3,100);
        GPIO_SetBits(GPIOA,GPIO_Pin_4); 
        GPIO_ResetBits(GPIOA,GPIO_Pin_5);  
		delay_ms(3000);
	    
	    TIM_SetCompare2(TIM3,100);
        GPIO_SetBits(GPIOA,GPIO_Pin_5); 
        GPIO_ResetBits(GPIOA,GPIO_Pin_4);
		delay_ms(3000);
	}	 
 }

time.c file

#include "timer.h"
#include "led.h"
#include "usart.h"


//TIM3 PWM Partial initialization 
//PWM Output initialization 
//arr： Automatic reload load value 
//psc  Clock prescaler factor 
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);	// Enable timer 3 The clock 
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  // Can make GPIO Peripheral clock 

 
    // initialization IOPA4
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  // Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	GPIO_ResetBits(GPIOA,GPIO_Pin_4);       
	
	// initialization IOPA5
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;   // Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	GPIO_ResetBits(GPIOA,GPIO_Pin_5);      
    // initialization IOPA7
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   // Multiplexing push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
    // initialization TIM3
	TIM_TimeBaseStructure.TIM_Period = arr; // Automatic reload load value 
	TIM_TimeBaseStructure.TIM_Prescaler =psc; // The prescaled coefficients 
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; // Set the clock split 
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  // Upcount mode 
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure); 
	
	// initialization TIM3 Channel2	 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; // choice PWM Pattern 2
 	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // Compare output enable 
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low ; // Output polarity 
	TIM_OC2Init(TIM3, &TIM_OCInitStructure);  

	TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  // Enable timer 3 passageway 2 Preload registers 
 
	TIM_Cmd(TIM3, ENABLE);  // Can make TIM3
}

time.h file

#ifndef __TIMER_H
#define __TIMER_H
#include "sys.h"

void TIM3_PWM_Init(u16 arr,u16 psc);
#endif

The above is a simple code implementation , You can adjust and modify according to your actual situation .

  Welcome to correct and exchange , You can discuss the code together when you are free .

It's not easy to make , Thank you for your support , thank ！！！！！！

  -------------- A person who is working hard