STM32学习--5-2 旋转编码器计次

接线图

按键按下，旋转编码器输出低电平

Encoder.c

#include "stm32f10x.h"                  // Device headerint16_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GPIOGPIO_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EXTIGPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0); // 配置中断GPIOB、pin0GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1); // 配置中断GPIOB、pin1EXTI_InitTypeDef EXTI_InitStructure;  // 配置EXTI_InitStructure参数EXTI_InitStructure.EXTI_Line = EXTI_Line0 | EXTI_Line1;  // 线14EXTI_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NVICNVIC_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0NVIC_InitStruct.NVIC_IRQChannelCmd= ENABLE;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority= 1; //设置抢占Preemption和响应优先级为1NVIC_InitStruct.NVIC_IRQChannelSubPriority= 1;NVIC_Init(&NVIC_InitStruct);NVIC_InitStruct.NVIC_IRQChannel= EXTI1_IRQn; // 设置1NVIC_InitStruct.NVIC_IRQChannelCmd= ENABLE;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority= 1; //设置抢占Preemption和响应优先级为1NVIC_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_Hvoid 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);}
}