江科大 STM32 PWM驱动直流电机

最新推荐文章于 2025-02-28 21:43:20 发布

原创最新推荐文章于 2025-02-28 21:43:20 发布 · 2.3k 阅读

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#stm32 #嵌入式硬件 #单片机

本文介绍了如何使用TB6612电机驱动模块，通过GPIO和TIM2进行电机速度控制，包括PWM初始化、方向控制和主函数的实现。

一.接线图

红色的是TB6612电机驱动模块
连接电机的两根线不分正反，对调知识反过来转动，AIN1和AIN2是方向控制，任意连接两个GPIO就行（此处接PA4、PA5）,PWMA是速度控制，需要接PWM的输出脚（PA2,PA2对应的是TIM2的通道3，到时候初始化通道三即可）

二.代码

2-1.PWM初始化

void PWM_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	TIM_InternalClockConfig(TIM2);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1;		//ARR
	TIM_TimeBaseInitStructure.TIM_Prescaler = 36 - 1;		//PSC
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;		//CCR
	TIM_OC3Init(TIM2, &TIM_OCInitStructure);
	
	TIM_Cmd(TIM2, ENABLE);
}

2-2改变PWM占空比代码

void PWM_SetCompare3(uint16_t Compare)
{
	TIM_SetCompare3(TIM2, Compare);
}

2-3方向控制引脚初始化

void Motor_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	PWM_Init();
}

2-4方向控制

void Motor_SetSpeed(int8_t Speed)
{
	if (Speed >= 0)
	{
		GPIO_SetBits(GPIOA, GPIO_Pin_4);
		GPIO_ResetBits(GPIOA, GPIO_Pin_5);
		PWM_SetCompare3(Speed);
	}
	else
	{
		GPIO_ResetBits(GPIOA, GPIO_Pin_4);
		GPIO_SetBits(GPIOA, GPIO_Pin_5);
		PWM_SetCompare3(-Speed);
	}
}

2-5主函数

int main(void)
{
	OLED_Init();
	Motor_Init();
	Key_Init();
	
	OLED_ShowString(1, 1, "Speed:");
	
	while (1)
	{
		KeyNum = Key_GetNum();
		if (KeyNum == 1)
		{
			Speed += 20;
			if (Speed > 100)
			{
				Speed = -100;
			}
		}
		Motor_SetSpeed(Speed);
		OLED_ShowSignedNum(1, 7, Speed, 3);
	}
}