关于单片机与编码器的问题求教

ID:613834 · 发表于 2020-9-1 09:41

你好，我在STM32中把TIM1配置为编码器模式，编码器的AB两项连到了TIM1的CH1和CH2，为什么没有读数啊
下边是我找的代码，麻烦大神看看哪里不对，谢谢

#include "decoder.h"
#include <stm32f4xx_tim.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_rcc.h>

uint16_t con_speed_period=20;

float Decoder_GetSpeed(void)
{
      static int16_t tmp;
      static float re_dat=0;
      tmp=(int16_t)Decoder_GetCnt();
      if(tmp>20000)tmp=20000;
      else if(tmp<-20000)tmp=-20000;


      re_dat=(float)((((int16_t)tmp)*1000/(1024.0*con_speed_period))*60);
      return re_dat;
}

void Decoder_Init(void)
{
      Decoder_GPIO_Init();
      Decoder_TIM_Init();
}

void Decoder_GPIO_Init(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE , ENABLE);/////////////////3333


      GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11|GPIO_Pin_9;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
      GPIO_Init(GPIOE, &GPIO_InitStructure);

      GPIO_PinAFConfig(GPIOE, GPIO_PinSource11, GPIO_AF_TIM1);
      GPIO_PinAFConfig(GPIOE, GPIO_PinSource9, GPIO_AF_TIM1);
}

void Decoder_TIM_Init(void)
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_ICInitTypeDef TIM_ICInitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);       /////////////123

      TIM_DeInit(TIM1);
      TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

      TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD-1;
      TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
      TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
      TIM_EncoderInterfaceConfig(TIM1, TIM_EncoderMode_TI12, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);

      TIM_ICStructInit(&TIM_ICInitStructure);
      TIM_SetCounter(TIM1, 0);
      TIM_Cmd(TIM1, ENABLE);
}

int Decoder_GetCnt()
{
      static int Decoder_cnt=0;
      Decoder_cnt=(short)(TIM1 -> CNT);
      TIM1 -> CNT=0;
      return Decoder_cnt;
}

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