stmF1开发，旋转编码器计数不精确咋办？

吴单机 · 发表于 2017-2-25 11:38:11

stmF1开发，旋转编码器旋钮计数，用数码管显示计数；
产生的问题是旋钮标志不精确，有时正旋会产生反旋中断；
请问如何解决？

我用的是旋钮时产生中断，在中断里设置正旋标志为1、反旋标志为2；在主函数中进行判断；
主函数中
while(1){                showNum(c_value);       // 数码管显示函数
               if(turn_flag)             // 旋转标志；正旋为1、反旋为2；计数完置零
                              {
                                    delay_ms(100);

                                    switch(turn_flag)
                                    {
                                             case 1:       c_value++;
                                             break;
                                             case 2:       c_value--;
                                             break;

                                             default:break;
                                    }

                                    turn_flag=0;
                                    t_flag=0;
                                    EXTI->IMR=0xffffffff;
                              }
      }

中断部分：
         初始化：
#include "interrupt.h"
#include <stdio.h>
#include "delay.h"

u8 turn_flag;

void int_init(void)
{
      EXTI_InitTypeDef EXTI_InitStruct;
      GPIO_InitTypeDef GPIO_InitStruct;
      NVIC_InitTypeDef NVIC_InitStruct;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

      GPIO_InitStruct.GPIO_Pin=GPIO_Pin_3|GPIO_Pin_1|GPIO_Pin_2;
      GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPU;
      GPIO_Init(GPIOA,&GPIO_InitStruct);

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource3);
      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource1);
      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource2);

      EXTI_InitStruct.EXTI_Line=EXTI_Line1|EXTI_Line2;
      EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;
      EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Rising_Falling;
      EXTI_InitStruct.EXTI_LineCmd=ENABLE;
      EXTI_Init(&EXTI_InitStruct);

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

      NVIC_InitStruct.NVIC_IRQChannel=EXTI1_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority=3;
      NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStruct);

      NVIC_InitStruct.NVIC_IRQChannel=EXTI2_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority=3;
      NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStruct);


}

void EXTI1_IRQHandler(void)
{

      if(EXTI_GetITStatus(EXTI_Line1)!=RESET)
      {
            turn_flag=1;

            EXTI->IMR=0xfffffff0;
            EXTI_ClearITPendingBit(EXTI_Line1);
      }
}

void EXTI2_IRQHandler(void)
{
            if(EXTI_GetITStatus(EXTI_Line2)!=RESET)
      {
            turn_flag=2;

               EXTI->IMR=0xfffffff0;
            EXTI_ClearITPendingBit(EXTI_Line2);
      }
}