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6-8编码器接口测速

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常用函数

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void TIM_EncoderInterfaceConfig(TIM_TypeDef* TIMx, uint16_t TIM_EncoderMode,uint16_t TIM_IC1Polarity, uint16_t TIM_IC2Polarity);

定时器编码器接口配置

编码器接口测速

Encoder.c

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#include "stm32f10x.h"                  // Device header

void Encoder_Init(void)
{
	//开启时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);//TIM3是APB1的外设
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//使用TIM3的通道1，引脚是PA6
	//配置GPIO
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//上拉输入
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
	TIM_TimeBaseInitStructure.TIM_Period = 65536 - 1;//ARR，这里最好设置大一些，防止溢出，这里给最大值
	TIM_TimeBaseInitStructure.TIM_Prescaler = 1 - 1;//PSC，这个值决定测周法的标准频率fc，根据信号频率分布范围调整
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
	//初始化输入捕获单元
	TIM_ICInitTypeDef TIM_ICInitStructure;
	TIM_ICStructInit(&TIM_ICInitStructure);
	TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;//选择通道
	TIM_ICInitStructure.TIM_ICFilter = 0xF;//滤波器
	TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//极性选择,代表不反向
	TIM_ICInit(TIM3,&TIM_ICInitStructure);
	TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;//选择通道
	TIM_ICInitStructure.TIM_ICFilter = 0xF;//滤波器
	TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//极性选择,代表不反向
	TIM_ICInit(TIM3,&TIM_ICInitStructure);
	
	TIM_EncoderInterfaceConfig(TIM3,TIM_EncoderMode_TI12,TIM_ICPolarity_Rising,TIM_ICPolarity_Rising);
	
	TIM_Cmd(TIM3,ENABLE);
}

int16_t Encoder_Get(void)
{
	int16_t Temp;
	Temp = TIM_GetCounter(TIM3);
	TIM_SetCounter(TIM3,0);
	return Temp;
}


main.c

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#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Timer.h"
#include "Encoder.h"
uint16_t Num;
int16_t Speed;
int main(void)
{
	OLED_Init();
	Timer_Init();
	Encoder_Init();

	OLED_ShowString(1,1,"CNT:");
	
	while(1)
	{
		OLED_ShowSignedNum(1,5,Speed,5);
	}
}

void TIM2_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM2,TIM_IT_Update) == SET)
	{
		Speed = Encoder_Get();
		TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
	}
}