STM32F103加旋转编码器实现正反转和旋转圈数读取

一、旋转编码器连接原理图

二、采集程序
STM32F103

#define key_dir() PBin(1)
#define key_sw() PBin(2)

void  key_init(void)
{
    
     	
	EXTI_InitTypeDef EXTI_InitStructure;
 	NVIC_InitTypeDef NVIC_InitStructure;
 	GPIO_InitTypeDef GPIO_InitStructure;
 
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);//使能PORTA,PORTE时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);	//使能复用功能时钟
	
	GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //设置成上拉输入
 	GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOE2,3,4



   //GPIOB.0	  中断线以及中断初始化配置 上升沿触发 PB0
 	 GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0); 

  	EXTI_InitStructure.EXTI_Line=EXTI_Line0;
  	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  	EXTI_Init(&EXTI_InitStructure);		//根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器


  	NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;			//使能按键WK_UP所在的外部中断通道
  	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;	//抢占优先级2， 
  	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;			//子优先级3
  	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;					//使能外部中断通道
  	NVIC_Init(&NVIC_InitStructure); 
}				  

	 
//外部中断0服务程序 
void EXTI0_IRQHandler(void)
{
    
    
	if(key_dir())
	{
    
    
		keyDir=1;
	}
	else
	{
    
    
		keyDir=2;
	}
	EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志位  
}

STM32F407

#define key_b PBin(4)
#define key PAin(15)
#define key_run PAin(3)


void key_init(void);//初始化		 

void key_init(void)
{
    
        	 
	GPIO_InitTypeDef  GPIO_InitStructure;
	EXTI_InitTypeDef   EXTI_InitStructure;
	NVIC_InitTypeDef   NVIC_InitStructure;

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB, ENABLE);//使能GPIOF时钟

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15|GPIO_Pin_3;//LED0和LED1对应IO口
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通输入模式
	GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//上拉
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通输入模式
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100M
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
	GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOE2,3,4

	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
	SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource3);//PE3 连接到中断线3	

	EXTI_InitStructure.EXTI_Line = EXTI_Line3;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中断线使能
	EXTI_Init(&EXTI_InitStructure);//配置
	
	
	NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;//外部中断3
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;//抢占优先级2
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子优先级2
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
	NVIC_Init(&NVIC_InitStructure);//配置	
}


//外部中断3服务程序
void EXTI3_IRQHandler(void)
{
    
    
	if(key_b==0)	 
	{
    
    
		printf("正转\r\n");
	}		 
	else
	{
    
    
		printf("反转\r\n");	
	}
	EXTI_ClearITPendingBit(EXTI_Line3);  //清除LINE3上的中断标志位  
}