接线图

 

 按键按下，旋转编码器输出低电平

Encoder.c

#include "stm32f10x.h"                  // Device header

int16_t Encoder_Count;
void Encoder_init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); // 开启APB2Periph外设GPIOB时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);  // 开启APB2Periph外设AFIO时钟
	// 配置GPIO
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;  // 中断输入设置为上拉输入
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStructure);
	// 配置EXTI
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0); // 配置中断GPIOB、pin0
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1); // 配置中断GPIOB、pin1
	
	EXTI_InitTypeDef EXTI_InitStructure;  // 配置EXTI_InitStructure参数
	EXTI_InitStructure.EXTI_Line = EXTI_Line0 | EXTI_Line1;  // 线14
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;  // 开启
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; // 中断模式
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; // 下降沿触发
	EXTI_Init(&EXTI_InitStructure);
	// 配置NVIC
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // 设置2位响应优先级2位抢占
	NVIC_InitTypeDef NVIC_InitStruct;
	NVIC_InitStruct.NVIC_IRQChannel= EXTI0_IRQn; // 设置0
	NVIC_InitStruct.NVIC_IRQChannelCmd= ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority= 1; //设置抢占Preemption和响应优先级为1
	NVIC_InitStruct.NVIC_IRQChannelSubPriority= 1;
	NVIC_Init(&NVIC_InitStruct);
	
	NVIC_InitStruct.NVIC_IRQChannel= EXTI1_IRQn; // 设置1
	NVIC_InitStruct.NVIC_IRQChannelCmd= ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority= 1; //设置抢占Preemption和响应优先级为1
	NVIC_InitStruct.NVIC_IRQChannelSubPriority= 1;
	NVIC_Init(&NVIC_InitStruct);
}

int16_t Encoder_Get(void)
{
	int16_t Temp;
	Temp = Encoder_Count;
	Encoder_Count = 0;
	return Temp;
}

void EXTI0_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line0) == SET)
	{
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1) == 0)  // 当pin0中断时，判断Pin1是否为低电平 默认低电平触发
		{
			Encoder_Count --;
		}
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

void EXTI1_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line1) == SET)
	{
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0)  // 当pin1中断时，判断Pin0是否为低电平
		{
			Encoder_Count ++;
		}
		EXTI_ClearITPendingBit(EXTI_Line1);
	}
}

Encoder.h

#ifndef __ENCODER_H
#define __ENCODER_H

void Encoder_init(void);
int16_t Encoder_Get(void);

#endif

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Encoder.h"

int16_t Num;

int main(void)
{	
	OLED_Init();
	Encoder_init();
	
	OLED_ShowString(1,3,"Num:");  // 字符串用双引号括起来
	while(1)
	{
		Num += Encoder_Get();
		OLED_ShowSignedNum(1,7,Num,5);
	}
}

效果图