l298n驱动两路电机pwm调速
时间: 2023-10-30 14:07:14 浏览: 185
L298N是一种常用的直流电机驱动芯片,它可以驱动两路电机,同时支持PWM调速。下面是一个L298N驱动两路电机PWM调速的示例:
1.连接电路
将L298N的IN1、IN2、IN3、IN4引脚分别连接到单片机的GPIO口,EN1、EN2引脚连接到单片机的PWM输出口,OUT1、OUT2、OUT3、OUT4引脚分别连接到电机。
2.编写程序
首先需要初始化PWM输出口,然后通过GPIO口控制IN1、IN2、IN3、IN4引脚的电平,从而控制电机的正反转。然后通过PWM输出口控制EN1、EN2引脚的占空比,从而控制电机的转速。
下面是一个基于STM32单片机的L298N驱动两路电机PWM调速的示例程序:
```c
#include "stm32f10x.h"
void PWM_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 1999;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_Cmd(TIM2, ENABLE);
}
void Motor_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void Motor_Control(int pwm1, int pwm2)
{
if(pwm1 > 0)
{
GPIO_SetBits(GPIOB, GPIO_Pin_0);
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
}
else
{
GPIO_SetBits(GPIOB, GPIO_Pin_1);
GPIO_ResetBits(GPIOB, GPIO_Pin_0);
pwm1 = -pwm1;
}
if(pwm2 > 0)
{
GPIO_SetBits(GPIOB, GPIO_Pin_10);
GPIO_ResetBits(GPIOB, GPIO_Pin_11);
}
else
{
GPIO_SetBits(GPIOB, GPIO_Pin_11);
GPIO_ResetBits(GPIOB, GPIO_Pin_10);
pwm2 = -pwm2;
}
TIM_SetCompare1(TIM2, pwm1);
TIM_SetCompare2(TIM2, pwm2);
}
int main(void)
{
PWM_Init();
Motor_Init();
while(1)
{
Motor_Control(1000, 500); //控制电机1转速为1000,电机2转速为500
}
}
```
在该程序中,PWM_Init()函数初始化PWM输出口,Motor_Init()函数初始化GPIO口,Motor_Control(int pwm1, int pwm2)函数控制电机的正反转和转速。可以通过调整Motor_Control()函数中的pwm1和pwm2参数来控制电机的转速,从而实现PWM调速。
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