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一、接线
旋转编码器,旋钮会不断接触断开触点产生电波。 由于两个电波之间相差90°,即为正交波,一个电波处于高电平时另一个处于低电平,所以可以用来判断旋转方向。
二、代码
复制粘贴4-1的工程文件,重命名为“5-2 旋转编码器计次”,在“Hardware”文件夹右键新建“Encoder.c”及“Encoder.h”,注意文件路径。
Encoder.c:
#include "stm32f10x.h" // Device headerint16_t Encoder_Count;void Encoder_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);GPIO_InitTypeDef GPIO_InitStruture;GPIO_InitStruture.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStruture.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;GPIO_InitStruture.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStruture);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);EXTI_InitTypeDef EXTI_InitStructure;EXTI_InitStructure.EXTI_Line = EXTI_Line0 | EXTI_Line1;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_Init(&EXTI_InitStructure);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);NVIC_InitTypeDef NVIC_InitStructure;NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_Init(&NVIC_InitStructure);
}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){Encoder_Count--;}EXTI_ClearITPendingBit(EXTI_Line0);}
}void EXTI1_IRQHandler(void)
{if (EXTI_GetITStatus(EXTI_Line1) == SET){if (GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0){Encoder_Count++;}EXTI_ClearITPendingBit(EXTI_Line1);}
}
NVIC_InitStructure可以复用,所以这里只定义一个即可使用两个中断。
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(1,1,"Num:");while(1) { Num += Encoder_Get();OLED_ShowSignedNum(1,5,Num,5);}
}
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